Log in

Relevant bibliographies by topics / Vinyl acetate. Emulsion polymerization. Polyvinyl alcohol / Journal articles

To see the other types of publications on this topic, follow the link: Vinyl acetate. Emulsion polymerization. Polyvinyl alcohol.

Journal articles on the topic 'Vinyl acetate. Emulsion polymerization. Polyvinyl alcohol'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 37 journal articles for your research on the topic 'Vinyl acetate. Emulsion polymerization. Polyvinyl alcohol.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Schlappa, Stephanie, Lee Josephine Brenker, Lena Bressel, Roland Hass, and Marvin Münzberg. "Process Characterization of Polyvinyl Acetate Emulsions Applying Inline Photon Density Wave Spectroscopy at High Solid Contents." Polymers 13, no. 4 (February 23, 2021): 669. http://dx.doi.org/10.3390/polym13040669.

Full text

Abstract:

The high solids semicontinuous emulsion polymerization of polyvinyl acetate using poly (vinyl alcohol-co-vinyl acetate) as protective colloid is investigated by optical spectroscopy. The suitability of Photon Density Wave (PDW) spectroscopy as inline Process Analytical Technology (PAT) for emulsion polymerization processes at high solid contents (>40% (w/w)) is studied and evaluated. Inline data on absorption and scattering in the dispersion is obtained in real-time. The radical polymerization of vinyl acetate to polyvinyl acetate using ascorbic acid and sodium persulfate as redox initiator system and poly (vinyl alcohol-co-vinyl acetate) as protective colloid is investigated. Starved–feed radical emulsion polymerization yielded particle sizes in the nanometer size regime. PDW spectroscopy is used to monitor the progress of polymerization by studying the absorption and scattering properties during the synthesis of dispersions with increasing monomer amount and correspondingly decreasing feed rate of protective colloid. Results are compared to particle sizes determined with offline dynamic light scattering (DLS) and static light scattering (SLS) during the synthesis.

APA, Harvard, Vancouver, ISO, and other styles

2

Gadhave, Ravindra V., Prakash A. Mahanwar, and Pradeep T. Gadekar. "Starch Stabilized Polyvinyl Acetate Emulsion: Review." Polymers from Renewable Resources 9, no. 2 (May 2018): 75–84. http://dx.doi.org/10.1177/204124791800900203.

Full text

Abstract:

The Increasing global energy crisis and scarcity of petroleum resources has shifted the focus of the hemical industries to look for alternative raw material resources. The main focus of raw materials in wood adhesives, such as petroleum and natural gas [1,2], would be gradually replaced by renewable bio-resource polymers. Starch is a relatively an inexpensive and renewable product from abundant plants, easy processing and it has been extensively used as paper binders, sizing materials, glues and pastes [3], but its bonding capacity is not strong enough to glue substrate like wood, paper. Conventionally available wood adhesive emulsions are colloid like polyvinyl alcohol stabilized. A new research on biodegradable, renewable, environmentally friendly starch stabilized polyvinyl acetate emulsion that was synthesized by the graft polymerization of vinyl acetate onto starch. In this paper, we reviewed starch as colloid for synthesis of polyvinyl acetate emulsion.

APA, Harvard, Vancouver, ISO, and other styles

3

Mu, Rui, Li Li Dai, Shu Li Fan, and Ai Min Deng. "Study of Epoxy Resin Emulsion by Emulsion Graft Polymerization." Advanced Materials Research 299-300 (July 2011): 98–101. http://dx.doi.org/10.4028/www.scientific.net/amr.299-300.98.

Full text

Abstract:

In the paper, the emulsion graft polymerization is used to prepare stable epoxy resin emulsion by vinyl acetate and polyvinyl alcohol (PVA) as emulsification stabilizer. It is studied for the influence on the properties of emulsion by temperature and dosages of functional monomer, acrylamide and acrylic acid, and initiator. The results show that the optimal conditions: reactive temperature is 75°C, acrylic acid is 2%~4%(mass concentration), acrylamide is 2%~4%(mass concentration) and initiator is 0.7%~0.8%(mass concentration).

APA, Harvard, Vancouver, ISO, and other styles

4

Shaffer, O. L., V. Dimonie, M. S. El-Aasser, and J. W. Vanderhoff. "Morphology study of polyvinyl acetate latex by etching with PTA." Proceedings, annual meeting, Electron Microscopy Society of America 47 (August 6, 1989): 366–67. http://dx.doi.org/10.1017/s0424820100153804.

Full text

Abstract:

Transmission electron microscopy has been used extensively for studying the morphology of latex particles. Special techniques have been developed such as preferential staining with osmium tetroxide (OsO4), ruthenium tetroxide (RuO4), freeze fracturing, microtoming and negative staining with phosphotungstic acid (PTA). The purpose of this study is to develop a new technique using PTA as an etching agent for poly(vinyl acetate)(PVAc) latex.Several latexes were prepared by both batch and semicontinuous emulsion polymerization with poly(vinyl alcohol)(PVA) as a stabilizer. Three types of PVA were used, high molecular weight Elvanol 52-40(DuPont) and Vinol 540(Air Products), and low molecular weight Vinol 205(Air Products). All the alcohols were partially hydrolyzed. A PVAc soap free(no PVA) latex was also prepared. To etch the particles one drop of latex was diluted in approximately one ml of 2% aqueous PTA. The volume of latex used depended upon the solids content of the latex and the size of the particles. The PTA latex dispersions were sampled at several intervals.

APA, Harvard, Vancouver, ISO, and other styles

5

QIAO, Jinzhong, Qiaoling ZHANG, and Yuan CHENG. "SYNTHESIS OF HIGH MOLECULAR WEIGHT POLYVINYL ALCOHOL BY MINI-EMULSION POLYMERIZATION OF VINYL ACETATE." Acta Polymerica Sinica 007, no. 2 (December 4, 2009): 124–29. http://dx.doi.org/10.3724/sp.j.1105.2007.00124.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Jaya, Adam, M. A. Elita Hafizah, A. Manaf, and Andreas Andreas. "THE INFLUENCE OF SURFACTANT AND PROTECTIVE COLLOID ON POLYVINYL ACETATE EMULSION SYNTHESIZED BY EMULSION POLYMERIZATION TECHNIQUE." Spektra: Jurnal Fisika dan Aplikasinya 5, no. 3 (December 31, 2020): 169–76. http://dx.doi.org/10.21009/spektra.053.01.

Full text

Abstract:

A series of experiments have been carried out and reported. This report describes the stages of the polymerization reaction during emulsion Polyvinyl Acetate (PVAc) synthesis. PVAc was synthesized from the Vinyl Acetate Monomer (VAM) with Ammonium Peroxydisulphate (APS) as an inorganic thermal initiator in the aqueous media under reaction temperature was keep at 65 until 75oCs by agitation speed was 300 rpm respectively during 4 hours of reaction time. The protective colloid agents and several types of surfactants were added to improve the obtained emulsion PVAc performance. The polymerization reaction was carried out without the addition of a protective colloid agent. The surfactants were produced the emulsion PVAc with the properties of solid content 0.89%, density 1.02 g/ml, viscosity 0.0033 Poise, pH 2.8, conductivity 12 ms, respectively. While the polymerization reaction involved protective colloid agents by using Polyvinyl Alcohol (PVOH) was obtained properties of emulsion PVAc with Solid Content 4.36%, density 1.17 g/ml, viscosity 0.0216 Poise, pH 2.8, and conductivity 10 ms respectively. The same thing was shown when the surfactant was present in the polymerization reaction. The emulsion PVAc was synthesized with nonionic surfactant has solid content 8.20%, density 1.17 g/ml, viscosity 0.0099 Poise, pH 2.8, and conductivity 7 ms, the result is better rather than synthesized with anionic surfactant has solid content 2.65%, density 1.13 g/ml, viscosity 0.0068 Poise, pH 2.8, and conductivity 11 ms. According to the preliminary observations obtained, emulsion PVAc’s appearance is better when the protective colloid agents and the surfactant is present rather than without additional those substances. The physical properties of emulsion were depended on the addition of protective colloid agents and surfactants. In addition, the complete reaction indicated by solid content value was obtained from emulsion when the additional substances were present. All the testing parameters were observed using Viscometer Ostwald, Pycnometer, pH Meter, FTIR Spectrophotometer, Conductometer, and another supporting testing to explain the polymerization reaction stage of synthesis emulsion PVAc.

APA, Harvard, Vancouver, ISO, and other styles

7

Chang, Ai Rong. "Preparation and Study of Polyvinyl Alcohol Fiber." Applied Mechanics and Materials 727-728 (January 2015): 227–30. http://dx.doi.org/10.4028/www.scientific.net/amm.727-728.227.

Full text

Abstract:

The preparation of polyvinyl alcohol fibers mainly consists of three steps: 1. The polymerization of vinyl acetate. Need the preparation of vinyl acetate and polymerization of vinyl acetate. The polymerization of vinyl acetate uses acetylene method and ethylene method.2. Preparation of PVA. Mainly to let the polyvinyl acetate taking alcoholysis reaction to the effect of methanol or sodium hydroxide. 3. Preparation of polyvinyl alcohol fiber. Complete dope preparation through washing and dehydration, dissolving, mixing, filtering and deaeration, and uses the dry, wet two methods to form the spinning. Finally, through the follow-up processing, to accomplish the preparation of polyvinyl alcohol fiber. Water soluble and high concentration polyvinyl alcohol fiber ‘s performances are fine and is application widely.

APA, Harvard, Vancouver, ISO, and other styles

8

Aprilian, Rafly, Mas Ayu Elita Hafizah, Azwar Manaf, and Andreas. "Conversion Enhancement of Vinyl Acetate Monomer to Polyvinyl Acetate Emulsion through Emulsion Polymerization Method." Materials Science Forum 1028 (April 2021): 263–68. http://dx.doi.org/10.4028/www.scientific.net/msf.1028.263.

Full text

Abstract:

Synthesis of Polyvinyl Acetate (PVAc) through the conversion of Vinyl Acetate Monomer (VAM) was carried out by emulsion polymerization method assisted by thermal initiator Ammonium persulfate (APS) under reaction temperature was kept at 70 °C – 80 °C with 5 hours of reaction time and agitation speed at 300 rpm. The polymerization reaction was running used batch process technique where is all components were mixed all together simultaneously. A set of polymerization reactions was conducted when the absence of surfactant and cationic and amphoteric surfactant presence. The monomer chain's double bond was found at 1645 cm-1 was measured by FTIR Spectrophotometer did not disappear after polymerization reaction was utterly done. The spectrum FTIR of Polyvinyl acetate did not explicitly found at 1644 cm-1. During the reaction, characterization was conducted by measuring the solid content value where the maximum solid content was achieved was 6,1 % when using Amphoteric surfactant while the lowest solid content was obtained when the absence of surfactant. Other parameters were conducted to observe the acidity value by pH Meter.

APA, Harvard, Vancouver, ISO, and other styles

9

Gilmore, C. M., G. W. Poehlein, and F. J. Schork. "Modeling poly(vinyl alcohol)-stabilized vinyl acetate emulsion polymerization. I. Theory." Journal of Applied Polymer Science 48, no. 8 (May 20, 1993): 1449–60. http://dx.doi.org/10.1002/app.1993.070480814.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Carrà, Stefano, Andrea Sliepcevich, Alessandro Canevarolo, and Sergio Carrà. "Grafting and adsorption of poly(vinyl) alcohol in vinyl acetate emulsion polymerization." Polymer 46, no. 4 (February 2005): 1379–84. http://dx.doi.org/10.1016/j.polymer.2004.11.061.

Full text

APA, Harvard, Vancouver, ISO, and other styles

11

Shaffei, K. A., A. B. Moustafa, and A. I. Hamed. "The Emulsion Polymerization of Each of Vinyl Acetate and Butyl Acrylate Monomers Using bis (2-ethylhexyl) Maleate for Improving the Physicomechanical Properties of Paints and Adhesive Films." International Journal of Polymer Science 2009 (2009): 1–6. http://dx.doi.org/10.1155/2009/731971.

Full text

Abstract:

Improving the water sensitivity of polyvinyl acetate PVAc films as well as pressure sensitivity, adhesion and washability of polybutyl acrylate were achieved by using bis (2-ethylhexyl) maleate (BEHM). The emulsion polymerization kinetics of vinyl acetate and butyl acrylate in presence of BEHM was studied. The order of the polymerization reaction with respect to the BEHM in presence of each of vinyl acetate and butyl acrylate was studied. The physicomechanical properties of the polyvinyl acetate films and vinyl acetate-butyl acrylate copolymer films were studied in presence of BEHM and the obtained results were matched with those prepared in the presence of pluronic F 108 and showed superior values. The obtained mean average molecular weights were found to be smaller in presence of BEHM assuring the presence of chain transfer reaction.

APA, Harvard, Vancouver, ISO, and other styles

12

Gilmore, C. M., G. W. Poehlein, and F. J. Schork. "Modeling poly(vinyl alcohol)-stabilized vinyl acetate emulsion polymerization. II. Comparison with experiment." Journal of Applied Polymer Science 48, no. 8 (May 20, 1993): 1461–73. http://dx.doi.org/10.1002/app.1993.070480815.

Full text

APA, Harvard, Vancouver, ISO, and other styles

13

Suleymanova, Aygul G., Erik R. Khusainov, Regina R. Spiridonova, and Aleхander S. Sirotkin. "Synthesis of water resistant and biostable polyvinyl acetate dispersions." Butlerov Communications 58, no. 4 (April 30, 2019): 92–97. http://dx.doi.org/10.37952/roi-jbc-01/19-58-4-92.

Full text

Abstract:

The characteristics of the emulsion polymerization of vinyl acetate in the presence of inorganic compounds such as silicon dioxide, titanium dioxide and polyhexamethylene guanidine hydrochloride are studied. It was found that, under the same synthesis conditions, inorganic additives affect the polymerization mechanism of vinyl acetate. The highest conversion of vinyl acetate can be obtained with the introduction of 0.5 wt% silicon dioxide. Polyhexamethylene guanidine hydrochloride also accelerates the reaction rate at the initial moment of time. However, the combined use of silicon dioxide and polyhexamethylene guanidine hydrochloride also reduces the reaction rate in comparison with the syntheses of vinyl acetate, carried out in the presence of each additive separately. The introduction of titanium dioxide, on the contrary, inhibits the reaction. However, when titanium dioxide and polhexamethylene guanidine hydrochloride are used together, the curve of the dependence of vinyl acetate conversion on time is close in process speed to the polymerization process of vinyl acetate without additives. The introduction of silicon dioxide and titanium dioxide makes it possible to increase by 1.5 times the water resistance of the resulting dispersions after short-term keeping glued samples in the water. At the same time, an increase in the water resistance of the samples after long-term contact with water allows only silica. The joint introduction of polyhexamethylene guanidine hydrochloride and silicon dioxide also led to improve the water resistant of adhesive joints, but not as significantly as in the case of the separate introduction of only silica. Polyhexamethylene guanidine hydrochloride increases the fungicidal activity of the resulting dispersions, and its combined use with titanium dioxide made it possible to improve the water resistance of the dispersion during long-term contact with water, in contrast to samples modified only with titanium dioxide. In addition, these samples showed greater fungicidal activity than samples containing silica and polymethylene guanidine hydrochloride.

APA, Harvard, Vancouver, ISO, and other styles

14

Gonz�lez, G. S. Magallanes, V. L. Dimonie, E. D. Sudol, H. J. Yue, A. Klein, and M. S. El-Aasser. "Characterization of poly(vinyl alcohol) during the emulsion polymerization of vinyl acetate using poly(vinyl alcohol) as emulsifier." Journal of Polymer Science Part A: Polymer Chemistry 34, no. 5 (April 15, 1996): 849–62. http://dx.doi.org/10.1002/(sici)1099-0518(19960415)34:5<849::aid-pola14>3.0.co;2-i.

Full text

APA, Harvard, Vancouver, ISO, and other styles

15

Omi, Shinzo, Eisuke Shiiyama, Ken'Ichi Sakurai, Hiroyuki Yoshimoto, Mamoru Iso, Akira Nakano, and Mamoru Nakamura. "Modification of polyvinyl chloride-vinyl acetate latex by seed emulsion polymerization of acrylic monomers." Polymer International 30, no. 2 (1993): 271–79. http://dx.doi.org/10.1002/pi.4990300222.

Full text

APA, Harvard, Vancouver, ISO, and other styles

16

Donescu, D., K. Goşa, A. Ciupiţoiu, and I. Languri. "Semicontinuous Emulsion Polymerization of Vinyl Acetate. Part I. Homopolymerization with Poly-(Vinyl Alcohol) and Nonionic Coemulsifier." Journal of Macromolecular Science: Part A - Chemistry 22, no. 5-7 (May 1985): 931–40. http://dx.doi.org/10.1080/00222338508056645.

Full text

APA, Harvard, Vancouver, ISO, and other styles

17

Egret, H�l�ne, Victoria L. Dimonie, E. David Sudol, Andrew Klein, and Mohamed S. El-Aasser. "Characterization of grafting in the emulsion polymerization of vinyl acetate using poly(vinyl alcohol) as stabilizer." Journal of Applied Polymer Science 82, no. 7 (2001): 1739–47. http://dx.doi.org/10.1002/app.2015.

Full text

APA, Harvard, Vancouver, ISO, and other styles

18

Lepizzera, Stephane M., and Archie E. Hamielec. "Nucleation of particles in seeded emulsion polymerization of vinyl acetate with poly(vinyl alcohol) as emulsifier." Macromolecular Chemistry and Physics 195, no. 9 (September 1994): 3103–15. http://dx.doi.org/10.1002/macp.1994.021950909.

Full text

APA, Harvard, Vancouver, ISO, and other styles

19

Li, Joshua Qing Song, Yan Qiu Wang, and Hai Wang. "Preparation and Characterization of Silica/Polymer Hybrid Submicron Particles via a Semi-Continuous Soap-Free Emulsion Polymerization." Advanced Materials Research 1120-1121 (July 2015): 225–32. http://dx.doi.org/10.4028/www.scientific.net/amr.1120-1121.225.

Full text

Abstract:

Submicron hybrid particles were prepared by direct polymerization of three monomers of styrene, methyl methacrylate (MMA), and vinyl acetate (VAC) onto the hydrophilic surface of 230 nm silica submicron particles without any coupling agent in a semi-continuous emulsifier-free emulsion polymerization at a monomer starved condition. The polymerization was initiated by potassium persulfate with constant monomer feed at 0.01, 0.02, or 0.04 mL/min, after adding 230 nm silica seed particles. The particle growth was investigated with a laser particle size analyzer and SEM, and the particle surfaces by Fourier transform infrared spectroscopy (FT-IR). It was founded that the growth of the hybrid particles depended on the hydrophobic characteristics of the polymers. When monomer was the most hydrophobic styrene, polystyrene (PS) shells split off from the hydrophilic surface of the unmodified silica particle whenever the shells reached a limit of ~20 nm. However, both polymethyl methacrylate (PMMA) and polyvinyl acetate (PVAC) shells grew constantly on the hydrophilic surface of silica particles. In the process of the whole reaction, the SiO2/PMMA and SiO2/PVAC hybrid particles kept almost monodisperse.

APA, Harvard, Vancouver, ISO, and other styles

20

Li, Joshua Qing Song, Hai Wang, and Yan Qiu Wang. "Preparation of Silica/Polymer Hybrid Nanoparticles via a Semi-Continuous Soup-Free Emulsion Polymerization." Advanced Materials Research 1120-1121 (July 2015): 233–42. http://dx.doi.org/10.4028/www.scientific.net/amr.1120-1121.233.

Full text

Abstract:

Hybrid nanoparticles were prepared by direct polymerization of methyl methacrylate, vinyl acetate, and styrene monomers onto the unmodified hydrophilic surfaces of 33 nm silica nanoparticles in a semi-continuous soap-free emulsion polymerization at a monomer starved condition. The polymerization was initiated by potassium persulfate with constant monomer feed at 0.01, 0.02, or 0.04 mL/min. The growth of the core-shell nanoparticles were measured by a laser particle size analyzer. FT-IR spectra analysis confirmed the hybrid structures of the synthesized nanoparticles. SEM images and size exclusion chromatography (SEC) results indicated regular core-shell microsphere structures. The hybrid nanoparticles increased in monodispersity and size over 100 nm with the reaction. However, SiO2/polystyrene (PS) nanoparticles grew much faster compared with SiO2/polymethyl methacrylate (PMMA) and SiO2/polyvinyl acetate (PVAC). There was particle coagulation, about 12 SiO2/PS particles aggregating to one, in the early stage of the seeded process. In addition, PS secondary particles were formed before the particle coagulation, and then merged with the SiO2/PS nanoparticles in the particle coagulation. The formation of SiO2/polymer hybrid nanoparticles depended on the hydrophilic characteristics of the polymer, and the size of silica seeds.

APA, Harvard, Vancouver, ISO, and other styles

21

Suzuki, Atsushi, Makoto Yano, Tadanobu Saiga, Kenji Kikuchi, and Takuji Okaya. "Study on the initial stage of emulsion polymerization of vinyl acetate using poly(vinyl alcohol) as a protective colloid." Colloid and Polymer Science 281, no. 4 (April 2003): 337–42. http://dx.doi.org/10.1007/s00396-002-0780-2.

Full text

APA, Harvard, Vancouver, ISO, and other styles

22

Sun, Mian, Youzhi Chen, Jiaoqun Zhu, Tao Sun, Zhonghe Shui, Gang Ling, and Haoxuan Zhong. "Effect of Modified Polyvinyl Alcohol Fibers on the Mechanical Behavior of Engineered Cementitious Composites." Materials 12, no. 1 (December 22, 2018): 37. http://dx.doi.org/10.3390/ma12010037.

Full text

Abstract:

：Polyvinyl alcohol (PVA) fiber was proposed to enhance the mechanical performance of engineered cementitious composite in this research. A mixture of engineered cementitious composite with better expected performance was made by adding 2% PVA fiber. Mechanics tests, including pressure resistance, fracture resistance, and ultimate tensile strength, were conducted. They reveal that the engineered cementitious composites not only exhibit good pressure resistance, but they also exhibit excellent fracture resistance and strain capability against tensile stress through mechanics tests, including pressure resistance, fracture resistance, and ultimate tensile resistance. To further improve the engineered composites’ ductility, attempts to modify the performance of the PVA fiber surface have been made by using a vinyl acetate (VAE) emulsion, a butadiene–styrene emulsion, and boric anhydride. Results indicated that the VAE emulsion achieved the best performance improvement. Its use in fiber pre-processing enables the formation of a layer of film with weak acidity, which restrains the hydration of adjacent gel materials, and reduces the strength of transitional areas of the fiber/composite interface, which restricts fiber slippage and pulls out as a result of its growth in age, and reduces hydration levels. Research illustrates that the performance-improvement processing that is studied not only improves the strain of the engineered cementitious composites, but can also reduce the attenuation of the strain against tensile stress.

APA, Harvard, Vancouver, ISO, and other styles

23

Wang, Bin, Xiaoming Bao, Mengjin Jiang, Guangdou Ye, and Jianjun Xu. "Synthesis of high-molecular weight poly(vinyl alcohol) by low-temperature emulsifier-free emulsion polymerization of vinyl acetate and saponification." Journal of Applied Polymer Science 125, no. 4 (January 30, 2012): 2771–78. http://dx.doi.org/10.1002/app.35464.

Full text

APA, Harvard, Vancouver, ISO, and other styles

24

Suzuki, Atsushi, Makoto Yano, Kenji Kikuchi, and Takuji Okaya. "Influence of additives on model emulsion polymerization of vinyl acetate (VAc) using poly(vinyl alcohol) (PVA) as a protective colloid." Colloid and Polymer Science 285, no. 2 (September 7, 2006): 185–92. http://dx.doi.org/10.1007/s00396-006-1549-9.

Full text

APA, Harvard, Vancouver, ISO, and other styles

25

Su, Ling, Erpeng Jia, Mengjin Jiang, and Jianjun Xu. "Preparation of Syndiotacticity-Rich High Molecular Weight Polyvinyl Alcohol by Low Temperature Emulsifier-Free Emulsion Copolymerization of Vinyl Acetate and Vinyl Pivalate." Journal of Macromolecular Science, Part A 52, no. 4 (March 2, 2015): 260–66. http://dx.doi.org/10.1080/10601325.2015.1007270.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

Lyoo, Won Seok, Sung Min Lee, Kang Koo, Joon-Seok Lee, Han Do Ghim, Jae Pil Kim, and Jinwon Lee. "Effect of emulsion polymerization conditions of vinyl acetate on the viscosity fluctuation and gelation behavior of aqueous poly(vinyl alcohol) solution." Journal of Applied Polymer Science 82, no. 8 (2001): 1897–902. http://dx.doi.org/10.1002/app.2034.

Full text

APA, Harvard, Vancouver, ISO, and other styles

27

Rocha‐Botello, Gabriela, Roberto Olvera‐Guillen, Jorge Herrera‐Ordonez, Martha Cruz‐Soto, and David Victoria‐Valenzuela. "Unexpected Secondary Nucleation in Poly(Vinyl acetate) Nanoparticle Synthesis by Ab Initio Batch Emulsion Polymerization Using Poly(Vinyl alcohol) as Surfactant." Macromolecular Reaction Engineering 13, no. 5 (August 13, 2019): 1900024. http://dx.doi.org/10.1002/mren.201900024.

Full text

APA, Harvard, Vancouver, ISO, and other styles

28

Niu, Lin, and Zhengbin Xia. "Comparison of the different emulsion polymerization routes between acrylic and vinyl acetate monomers using poly(vinyl alcohol) as the sole stabilizer." Colloid and Polymer Science 290, no. 8 (January 8, 2012): 699–707. http://dx.doi.org/10.1007/s00396-011-2579-5.

Full text

APA, Harvard, Vancouver, ISO, and other styles

29

Lyoo, Won Seok, Jin Woo Kwak, Kyu Ha Choi, and Seok Kyun Noh. "Preparation of high molecular weight poly(vinyl alcohol) with high yield by emulsion polymerization of vinyl acetate using 2,2?-azobis(2-amidinopropane) dihydrochloride." Journal of Applied Polymer Science 94, no. 6 (2004): 2356–62. http://dx.doi.org/10.1002/app.20731.

Full text

APA, Harvard, Vancouver, ISO, and other styles

30

Sihombing, Rony Pasonang, Robby Sudarman, and Agustinus Ngatin. "Pengaruh Konsentrasi Surfaktan Non-Ionik Terhadap Viskositas Perekat Polivinil Asetat Berbasis Air." KOVALEN: Jurnal Riset Kimia 6, no. 3 (December 30, 2020): 165–70. http://dx.doi.org/10.22487/kovalen.2020.v6.i3.15278.

Full text

Abstract:

Substrate combining could be done by using adhesive. In Indonesia, especially industrial field, solvent base adhesives were still being developed. This kind of adhesive was not environmental friendly and not safe handling. Therefore, Polyvinyl Acetate (PVAc) water-based adhesive was prepared as an outcome of this research as one of solution to overcome the problem above. Effect of surfactant concentration on the viscosity was aimed at this research. Semi continuous polymerization with stirring motor rates on 50 – 500 rpm was used (optional). Pressure of 1 atm, 750C temperature, 5 – 6 hours reaction time for each was used as polymerization operation in this research. Vinyl Acetate Monomer (VAM), partial hydrolysis Polyvinyl Alcohol (PVOH), water, Ammonium Persulfate (APS) were prepared as raw material. NP-10 and NP-06 were non-ionic surfactants which each concentration was varied in this research. Water-based adhesive with NP-06 concentration variation resulting in viscosity from 98 m.Pa for 0.17 %wt concentration to 213 m.Pa for 0.68 %wt concentration. While NP-10 concentration variation resulting viscosity from 143 m.Pa for 0.17 %wt to 321 m.Pa for 0.68 %wt concentration. Therefore, adhesive with NP-10 surfactant concentration variable has a higher viscosity rate than NP-06 ones. Keywords: Water-based adhesive, non-ionic surfactant, adhesive viscosity

APA, Harvard, Vancouver, ISO, and other styles

31

Wu, Yan Bo, Cheng Fei Lv, and Mei Na Han. "Synthesis and Performance Study of Polybasic Starch Graft Copolymerization Function Materials." Advanced Materials Research 79-82 (August 2009): 43–46. http://dx.doi.org/10.4028/www.scientific.net/amr.79-82.43.

Full text

Abstract:

The graft copolymerization of mixed grafting monomers vinyl acetate and butyl acrylate onto grafting skeleton of corn starch have been investigated using ammonium persulfate as initiator. Starch based wood adhesive prepared by in emulsion synthesis have green material, superior property, low cost. The effects of various factors on the graft copolymerization were studied such as reaction time, reaction temperature, initiator concentration as well as match of mixed monomers. By single-factor tests, the optimum graft copolymerization conditions with higher grafting efficiency and grafting percent ratio correspond to the reaction time of 3h, the graft polymerization reaction temperature of about 65°C, the initiator concentration of 9.7×10-3mol/L, the mixed grafting monomers concentration of 1.0 mol/L, the volume ratio of vinyl acetate to butyl acrylate of 5:5. The starch graft copolymer after purification was characterized, and its properties were determined. IR spectra of graft copolymers indicated that the carbonyl group characteristic absorption peak existed at 1730～1740cm-1 besides that of starch. The XRD pattern showed there were several dispersion peaks, therefore the graft copolymerization was the concomitant structure of a little crystalline state and amorphous state. TG and DTA curves confirmed the occurrence of graft copolymerization, and showed that the thermal stability of starch copolymer was better than that of pure corn starch. Starch based wood adhesive is white or cream white emulsion paste, excellent emulsive properties and high temperature stability. All properties of starch based wood adhesive can meet the national standard HG/T2727 - 95 of polyvinyl acetate wood adhesive, and the compressive shear strength outdistances the national standard especially.

APA, Harvard, Vancouver, ISO, and other styles

32

Yan, Jin, Guang Xue Chen, Shuang Shuang Wen, Xiao Meng Cui, and Zhen Cai Qu. "Study on Synthesis and Paper-Plastic Composite Property of Maleic Rosin Modified Acrylic Resin." Advanced Materials Research 174 (December 2010): 462–65. http://dx.doi.org/10.4028/www.scientific.net/amr.174.462.

Full text

Abstract:

In this paper, allyl maleated rosin ester was synthesized by the esterification of maleic rosin and allyl alcohol with catalyst. And then a new waterborne paper-plastic composite adhesive was prepared through the semi-continuous emulsion polymerization method with allyl maleated rosin ester, butyl acrylate, vinyl acetate and acrylic acid as raw materials. The product of esterification was analyzed by IR spectra, and its acid value was determined too. Polymer was analyzed by DSC and IR spectra and its T-style peel strength was determined. The adsorption effect of adhesives to ink was also tested. The results showed that this paper-plastic composite adhesive had good adhesive properties: excellent compatibility with the ink, longer stability period, and low cost.

APA, Harvard, Vancouver, ISO, and other styles

33

López-Suevos, Francisco, and Charles E. Frazier. "Fracture cleavage analysis of PVAc latex adhesives: Influence of phenolic additives." Holzforschung 60, no. 3 (May 1, 2006): 313–17. http://dx.doi.org/10.1515/hf.2006.050.

Full text

Abstract:

Abstract Mode I fracture cleavage testing was conducted on wood bonded with poly(vinyl acetate-co-NMA) latex adhesive containing two types/degrees of cross-linking: (1) cross-linking through AlCl3 catalysis of N-methylolacrylamide (NMA) comonomer; and (2) additional cross-linking using a phenol-formaldehyde resol additive, in addition to AlCl3 catalysis. The formulation lacking the phenolic additive performed well under dry conditions; but it completely failed during testing as a result of accelerated weathering. In contrast, fortification with the phenolic additive provided durability against accelerated weathering. In an effort to understand the effects of accelerated weathering, parallel-plate dynamic mechanical analysis was applied to freestanding neat adhesive films and to wood-bonded films (composites). Accelerated weathering dramatically altered the viscoelastic response of films and composites that lacked the phenolic additive; weathering caused a second, broad and reversible relaxation near 100°C, which might be because of softening of the poly(vinyl alcohol) interfacial agent used during emulsion polymerization. In contrast, samples formulated with the phenolic additive only displayed the typical base-polymer glass transition. Correlation of the fracture testing and the rheological analysis suggests that the phenolic additive promotes adhesive durability by cross-linking the interparticle boundaries, where poly(vinyl alcohol) is believed to reside.

APA, Harvard, Vancouver, ISO, and other styles

34

Budhlall, B. M., E. D. Sudol, V. L. Dimonie, A. Klein, and M. S. El-Aasser. "Role of grafting in the emulsion polymerization of vinyl acetate with poly(vinyl alcohol) as an emulsifier. I. Effect of the degree of blockiness on the kinetics and mechanism of grafting." Journal of Polymer Science Part A: Polymer Chemistry 39, no. 20 (2001): 3633–54. http://dx.doi.org/10.1002/pola.10016.

Full text

APA, Harvard, Vancouver, ISO, and other styles

35

López-Suevos, Francisco, and Charles E. Frazier. "The role of resol fortifiers in latex wood adhesives." Holzforschung 60, no. 5 (August 1, 2006): 561–66. http://dx.doi.org/10.1515/hf.2006.093.

Full text

Abstract:

Abstract Static and dynamic rheological analyses using time/temperature equivalence were applied to freestanding poly(vinyl acetate-co-NMA) adhesive films and to wood-bonded films (composites), which were completely dry in all cases. Films and composites were prepared with two types of cross-linking: (1) cross-linking through AlCl3 catalysis of N-methylolacrylamide (NMA) comonomer; and (2) additional cross-linking using a resol phenolic (PF) additive, in addition to AlCl3 catalysis. Rheological experiments revealed that accelerated weathering (AW) significantly modified the mechanical response of films and composites lacking the PF additive. For samples lacking PF fortifier, AW caused a new thermal transition appearing as a major mechanical softening in the long time domain (creep master curves) or in the low-frequency region (dynamic master curves). This new transition correlated to a performance loss found with fracture testing in a previous publication. Here, the static and dynamic rheological data indicated that the AW-induced softening was a reversible transition. Differential scanning calorimetry analysis and the manipulation of physical aging effects demonstrated that the AW-induced softening was a glass transition. The calorimetric weakness and temperature of this transition indicated that it corresponds to the Tg of poly(vinyl alcohol) (PVOH), which is the emulsion polymerization interfacial agent. In contrast, all PF-formulated samples displayed only the base polymer Tg. Therefore, the PF additive prevented weathering effects that lead to PVOH softening. Atomic force and scanning electron microscopy provided visual evidence of the action of PF on PVOH at interparticle boundaries. We suggest that the PF fortifier enhances latex durability through the formation of hydrolytically stable PVOH cross-links at the interparticle boundaries.

APA, Harvard, Vancouver, ISO, and other styles

36

Saiga, Tadanobu, Atsushi Suzuki, Kenji Kikuchi, and Takuji Okaya. "Surface sulfate groups on poly(methyl methacrylate) and poly(vinyl acetate) particles from soap-free emulsion polymerization." e-Polymers 5, no. 1 (December 1, 2005). http://dx.doi.org/10.1515/epoly.2005.5.1.811.

Full text

Abstract:

AbstractThe amounts of sulfate groups on the particle surfaces of poly(methyl methacrylate) (PMMA) and poly(vinyl acetate) (PVAc) obtained in soap-free emulsion polymerization were determined. Polymerization was carried out at low monomer concentration using ammonium persulfate as an initiator. After the ionexchange procedure, conductometric titration was carried out. Amounts of surface sulfate groups were lower and particle diameter was larger in the PMMA system compared with PVAc. A large and remarkable difference appeared in the ratio of surface sulfate groups to decomposed sulfate radicals, viz. 90% for the PVAc system and 50% for PMMA. The ratios of sulfate groups per polymer molecule on PMMA and PVAc particles (functionality) were calculated. The functionality of the PMMA system was 70% of the theoretical value, while it was close to 100% in the PVAc system. This large difference might arise from the weak reactivity of the sulfate radical with MMA compared with that of VAc, due to the strong electrophilic nature of the radical. A side reaction of the sulfate radical with MMA is assumed. On the basis of these experimental results, the instability of the emulsion polymerization of acrylic monomers using poly(vinyl alcohol) (PVA) as a protective colloid is discussed in terms of the instability of the soap-free particles formed after the consumption of free PVA in water by the grafting reaction.

APA, Harvard, Vancouver, ISO, and other styles

37

Rodríguez-Pizano, José Josué, Laura Edith Granados-Rivera, Héctor Hernández-Escoto, and David Contreras-López. "Effect of the operating conditions on the particle size distribution by the suspension polymerization process." ECORFAN Journal Bolivia, June 30, 2019, 1–12. http://dx.doi.org/10.35429/ejb.2019.10.6.1.12.

Full text

Abstract:

In this research, we focus on the study of the operating conditions that influence on suspension process for obtaining (co)polymers of styrene with polar monomers (copolymers of styrene with acrylate of butyl (S-BA) and copolymers of styrene with vinyl acetate (S-VAc)) using the technique of conventional free radical polymerization (FRP). At higher agitation speed, the reaction performance decreases. Likewise, the influence of the molecular weight of the dispersing agent, in this case polyvinyl alcohol (PVA), influences the polymerization performance was also observed. That is, at a higher molecular weight of PVAs, there is an increase in the particle size of the bead and in the polymerization yield. Finally, there is an influence of the polar part on the copolymer both for the yield and for the particle size of the bead. When obtaining copolymers of S-VAc, the yield is lower compared to the respective styrene homopolymer and higher in the S-BA.

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!