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Academic literature on the topic 'Polyvinyl alkohol'
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Journal articles on the topic "Polyvinyl alkohol"
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Sunardi, Sunardi, Nur Firda Trianda, and Utami Irawati. "Pengaruh Nanoselulosa dari Pelepah Nipah sebagai Filler terhadap Sifat Bioplastik Polivinil Alkohol." Justek : Jurnal Sains dan Teknologi 3, no. 2 (November 30, 2020): 69. http://dx.doi.org/10.31764/justek.v3i2.3704.
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In this research, the synthesis of nanocellulose from Nypa fruticans fronds as a filler of polyvinyl alcohol-based bioplastic has been carried out. Nanocellulose synthesis was carried out using sulfuric acid hydrolysis process with a concentration of 30% and the results were analyzed using a Particle Size Analyzer. The effect of addition of the amount of nanocellulose on bioplastics from polyvinyl alcohol such as moisture content, thickness, transparency, vapor transmission rate, solubility and functional group analysis using FTIR have been evaluated. The results showed that the nanocellulose from Nypa fruticans fronds had a diameter below 600 nm. The addition of nanocellulose with a concentration of 0.2%; 0.4% and 0.6% into the polyvinyl alcohol bioplastic can increase the thickness and transparency of the bioplastic, and reduce the water vapor transmission rate. However, the addition of nanocellulose in this range did not significantly affect the water content and the solubility of bioplastics in water.
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Novitasari, Riska, Siang Tandi Gonggo, and Suherman Suherman. "Pengaruh Silika Terhadap Membran Blend Kitosan-Polivinil Alkohol-Litium Sebagai Membran Elektrolit Baterai Ion Litium." Jurnal Akademika Kimia 5, no. 1 (March 15, 2017): 44. http://dx.doi.org/10.22487/j24775185.2016.v5.i1.7999.
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Battery is one of a source of energy. Increasing the need of energy affects to the diminishing reserves of fossil energy sources. Therefore, this needs for energy sources alternative. Modification of chitosan-polyvinyl alcohol electrolyte membrane added with lithium salt has an advantage on environmentally friendly. This research aims to study the effect of adding percent weight of silica on the conductivity of the electrolyte polymers made from chitosan-polyvinyl alcohol-lithium. The ionic conductivity of the electrolyte polymer chitosan-polyvinyl alcohol-lithium-silica was measured by impedance spectroscopy. The results showed the electrolyte polymer with the addition of 5% silica performed the highest ionic conductivity by 2.005 x 10-7 S/cm. Characteristic of battery made from electrolyte polymer chitosan-polyvinyl alcohol-lithium with the addition of silica performed voltage of 1.5 Volts which was comparable to the commercial battery with the voltage of 1.8 Volts. These results indicate that silica can be used as a filler to improve the ionic conductivity.
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Sari, Nofita, Maudy Mairisya, Riska Kurniasari, and Sari Purnavita. "Bioplastik Berbasis Galaktomanan Hasil Ekstraski Ampas Kelapa Dengan Campuran Polyvinyl Alkohol." METANA 15, no. 2 (November 27, 2019): 71–78. http://dx.doi.org/10.14710/metana.v15i2.24892.
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Penelitian ini bertujuan untuk mendapatkan kondisi optimum yang meliputi luas permukaan dan jumlah solven pada proses ekstraksi galaktomanan dari ampas kelapa terhadap yield yang dihasilkan dan mendapatkan kondisi optimumpada proses pembuatan bioplastik yang meliputi jumlah sorbitol dan waktu pencampuran terhadap karakteristik bioplastik yang meliputi ketebalan, ketahanan air, kuat tarik, elongasi, waktu degradasi dan morfologi.Bioplastik merupakan plastik yang dapat diuraikan oleh mikroorganisme dalam waktu yang singkat, sehingga lebih ramah lingkungan dibandingkan plastik konvensional.Bioplastik terbuat dari bahan polimer alami seperti pati, selulosa atau lemak.Penelitian pembuatan bioplastik ini berbasis dari galaktomanan ampas kelapa dan PVA. Galaktomanan merupakan polimer alami yang memiliki kemampuan membuat lapisan film.Polyvinyl alkohol (PVA) merupakan polimer sintetik namun memiliki sifat mudah larut dalam air sehingga dapat digunakan sebagai bahan campuran pembuatan bioplastik. PVA juga mampu meningkatkan elastisitas dan kuat tarik bioplastik. Penelitian ini menghasilkan bioplastik dengan ketebalan terbaik 0,18 mm dan prosentase ketahanan air tertinggi 74,76%. Tensile strength bioplastik terbaik dengan nilai 7,55 MPa, sedangkan prosentase elongation terbaik 46,81%. Bioplastik pada penelitian ini memiliki titik leleh (MP) 120°C dan terdegradasi sempurna dalam 24 jam. This study aims to obtain optimum conditions which are including surface area and amount of solvent in the galactomannan extraction process from coconut pulp to the produced yield and obtaining the optimum conditions in the bioplastic manufacturing process which are included the amount of sorbitol and mixing time of the bioplastic characteristics including thickness, water resistance, tensile strength, elongation, degradation time and morphology. Bioplastics are plastics that can be decomposed by microorganisms in a short time, making them more environmentally friendly than conventional plastics bioplastics made from natural polymer materials such as starch, cellulose, or fat. The research in making bioplastics was based on galactomannan coconut pulp and PVA. Galactomannan is a natural polymer that can make film layers. Polyvinyl alcohol (PVA) is a synthetic polymer but has properties that are soluble in water so it can be used as a mixture of bioplastics. PVA is also able to increase the elasticity and strong pull of bioplastics. This study produced bioplastics with the best thickness of 0,18mm and the highest percentage of water resistance in 74,76%. The best bioplastic tensile strength at 7,55 MPa value, while the best percentage of elongation 46,81%. Bioplastics in this study had a melting point (MP) of 120 ° C and were degraded correctly in 24 hours.
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Gonggo, Siang Tandi, Anang Wahid M. Diah, and Reki Lanteene. "Pengaruh Kaolin Terhadap Membran Blend Kitosan Poli Vinil Alkohol-Litium Sebagai Membran Elektrolit Untuk Aplikasi Baterai Ion Litium." Jurnal Akademika Kimia 6, no. 1 (December 8, 2017): 55. http://dx.doi.org/10.22487/j24775185.2017.v6.i1.9229.
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Today, the battery is the most practical and in expensive energy storage device in a modern community. A variety of new materials technologies has been developed in the manufacture of the battery, especially the development of the solid electrolyte (solid). Polymer Electrolytes can be found in the polymer batteries form such as lithium ion polymer battery. A natural polymer such as chitosan is potential as polymer electrolyte membrane for battery applications. The chitosan has amino and hydroxyl groups that allow for modification. The modification of chitosan membrane is expected to produce the better membranes characters. The aim of this research is to study the effect of the addition of inorganic filler kaolin on the conductivity of the polymer electrolyte that made of chitosan-polyvinyl alcohol than was added to the lithium salt. The ionic conductivity of the polymer electrolyte chitosan-polyvinyl alcohol-lithium-kaolin was measured by using an impedance spectroscopy. The measurement results showed that the polymer electrolyte chitosan-polyvinyl alcohol-lithium with the addition of 4% kaolin provide the highest ionic conductivity is large 6.551x10-5 S/cm. In comparison, characteristics of batteries that made from polymer electrolyte chitosan-polyvinyl alcohol-lithium with the addition of kaolin have a voltage of 2.4 volts which have similarities to the commercial batteries. This result indicates that the kaolin can be used as a filler to increase the ionic conductivity of the polymer electrolyte chitosan-polyvinyl alcohol-lithium, and then it can be developed as a battery.
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Santoso, Ivan, Tria Prayoga, Ika Agustina, and Wiwit Setya Rahayu. "FORMULASI MASKER GEL PEEL-OFF PERASAN LIDAH BUAYA (Aloe vera L.) DENGAN GELLING AGENT POLIVINIL ALKOHOL." Jurnal Riset Kefarmasian Indonesia 2, no. 1 (January 15, 2020): 17–25. http://dx.doi.org/10.33759/jrki.v2i1.33.
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Aloe vera (Aloe Vera L.) is a plant which commonly used by local people as moisturizer. The usage of aloe vera can be applied in form of peeled off gel mask with polyvinyl alcohol as gelling agent. The goal of this research is to determine the influence of increase of polyvinyl alcohol as gelling agent to the formulation of peeled off mask from aloe vera juice. The formulation was made in a few concentration, 10%, 12%, and 14% by adding 0,5% of aloe vera juice. After that, the formulation evaluated for 4 weeks about the organoleptics, homogenity, pH, drying time and viscosity. The date of pH test and drying time analyzed by using one way ANOVA statistically and then followed by Tukey HSD test and the viscosity analyzed by using Kruskall Wallis statistically which result in the significantcy less than 0,05 that mean there are difference in drying time and viscosity, on the other hand there is no difference in pH.
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B Tou, Fathia Arami, Eti Indarti, and Ismail Sulaiman. "Pengaruh Penambahan Nanoselulosa dari Tandan Kosong Kelapa Sawit (Elaeis guinensis Jacq) terhadap Karakteristik Polivinil Alkohol (PVA)." Jurnal Ilmiah Mahasiswa Pertanian 5, no. 2 (May 1, 2020): 203–9. http://dx.doi.org/10.17969/jimfp.v5i2.14837.
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Abstrak: Tandan kosong kelapa sawit merupakan limbah padat terbesar yang dihasilkan oleh perkebunan kelapa sawit. Kandungan utama tandan kosong kelapa sawit adalah selulosa. Tingginya kandungan selulosa pada tandan kosong kelapa sawit dapat dimanfaatkan sebagai bahan dasar pembuatan nanoselulosa. Nanoselulosa merupakan selulosa yang dihasilkan dalam skala nano dan memiliki sifat karakteristik yang jauh lebih baik dibandingkan dengan selulosa. Pada penelitian ini dilakukan isolasi selulosa yang berasal dari tandan kosong kelapa sawit untuk menghasilkan nanoselulosa yang dapat dimanfaatkan sebagai pencampur (filler) pada polimer polivinil alkohol (PVA), sehingga diharapkan dapat memperbaiki karakteristik pada PVA. Tujuan dari penelitian ini yaitu untuk mengkaji isolasi selulosa menjadi nanoselulosa dari tandan kosong kelapa sawit serta mempelajari karakteristik pada PVA dengan adanya penambahan nanoselulosa. Penelitian ini dilakukan menggunakan rancangan penelitian deskriptif yang terdiri dari jumlah penambahan nanoselulosa (N) dan jumlah PVA (P). Karakterisasi yang dilakukan adalah uji ketebalan, uji kuat tarik, uji FT-IR, uji WVP, dan uji UV-Vis Spectrophotometer. Hasil dari penelitian menunjukkan bahwa penambahan nanoselulosa berpengaruh terhadap karakteristik film PVA. The Effects of Adding Nanocellulose From Oil Palm Empty Fruit Bunch (Elaeis guinensis Jacq) For Characterization of Polyvinil Alcohol (PVA) Abstract: Oil palm empty fruit bunches (OPEFB) are the largest solid waste produced by oil palm plantations. The main content of oil palm empty fruit bunches is cellulose. High cellulose content in oil palm empty fruit bunches can be used for making nanocellulose. Nanocellulose is cellulose that produced in nanoscale and it has better characteristic properties compared to cellulose. In this study, cellulose from oil palm empty fruit bunches was isolated to produce nanocellulose that can be used as filler for characterization of polyvinil alcohol (PVA). The purpose of this study is to examined the isolation of cellulose into nanocellulose from oil palm empty fruit bunches and to investiage the characteristics of PVA with the addition of nanocellulose. This study was conducted using a descriptive research design consisting of 2 (two) factors. The first factor was the total addition of nanocellulose (N) and the second factor was the amount of polyvinyl alcohol (P). The characterization that carried out were a thickness test, tensile strength, Fourier Transform Infra-Red (FT-IR), Water Vapor Permeability (WVP), and UV-Vis Spectrophotometer. The results of the study showed that the addition of nanocellulose can effect the characteristics of PVA films.
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Sultan, Asriana, Nur Ida, and Isriany Ismail. "Peningkatan Kadar Ketoprofen Terdisolusi melalui Pembentukan Dispersi Padat menggunakan Polivinil Alkohol (PVA)." Jurnal Farmasi Galenika (Galenika Journal of Pharmacy) (e-Journal) 5, no. 1 (March 28, 2019): 43–48. http://dx.doi.org/10.22487/j24428744.2019.v5.i1.12096.
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Ketoprofen is included in the Class II of Biopharmaceutical Classification System (BCS) which has low solubility. Low solubility will affect the dissolution rate and the dissolved concentration, so the absorption and bioavailability are low as well. Several studies have been conducted to improve the solubility and the dissolution of drugs from these group, such as by solid dispersion system. This study aims to determine the effect of polyvinyl alcohol (PVA) on the dissolved concentration of ketoprofen in solid dispersion and in physical mixture, and to decidethe optimum formula.Solid dispersion and physical mixture of ketoprofen - PVA were formulated with the ratio of 1:1, 1:2 and 1:4, and then compared with the standard ketoprofen. Evaluation of solid dispersion was performed by the intervention test of PVA as a matrix on the maximum wavelength of standard ketoprofen using a UV-Vis spectrophotometer and the dissolution test in artificial gastric fluid media without pepsin using a basket stirrer at pH ± 1,2, the temperature of 37 ± 0.5ºC, and device speed of 50 rpm. The sample was collected at 10, 20, 30, 45, and 60 minutes. The amount of dissolved ketoprofen was determined by a UV-Vis spectrophotometer at a wavelength of 260 nm. The results showed that there was no shifting on maximum wavelength point in both solid dispersions and physical mixtures. The dissolved ketoprofen concentration that was represented in solid dispersion was greater than in physical mixture and standard ketoprofen. The highest dissolved ketoprofen concentration was indicated in solid dispersion formula with the ratio of 1:1.
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Rahayu, Lale Budi Hutami, Ika Oktavia Wulandari, D. J. Djoko H. Santjojo, and Akhmad Sabarudin. "Effect of Stirring Speed on Characteristics of Fe3O4 Nanoparticles Coated with Polyvinyl Alcohol and Glutaldehyde as a Crosslinker." Natural B 4, no. 3 (April 1, 2018): 127–34. http://dx.doi.org/10.21776/ub.natural-b.2018.004.03.1.
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Rahayu, Lale Budi Hutami, Ika Oktavia Wulandari, D. J. Djoko H. Santjojo, and Akhmad Sabarudin. "Effect of Stirring Speed on Characteristics of Fe3O4 Nanoparticles Coated with Polyvinyl Alcohol and Glutaldehyde as a Crosslinker." Natural B 004, no. 03 (April 1, 2018): 127–34. http://dx.doi.org/10.21776/ub.natural-b.2012.004.03.1.
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Hamzah, Mohd Syahir Anwar, Nurul Amira Ab Razak, Celine Ng, Akmal Hafiszi Abdul Azize, Jumadi Abdul Sukor, Soon Chin Fhong, Mohd Safiee Idris, and Nadirul Hasraf Mat Nayan. "PREPARATION OF THE ELECTROSPUN POLYVINYLIDENE FLUORIDE / POLYVINYL ALCOHOL SCAFFOLD AS A POTENTIAL TISSUE REPLACEMENT." IIUM Engineering Journal 22, no. 1 (January 4, 2021): 245–58. http://dx.doi.org/10.31436/iiumej.v22i1.1548.
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: Polyvinylidene fluoride (PVDF), a piezoelectric material, is commonly used in tissue engineering due to its potential for mimicking the electrical microenvironment of biological conditions for tissue development. In this present research, polyvinyl alcohol (PVA) was introduced into electrospun PVDF fabrication through an electrospinning process, aiming to enhance the nanofibrous membrane's biocompatibility properties by improving the hydrophilicity properties to act as an artificial tissue scaffold. The electrospun PVDF/PVA membranes are found to be optimum at a PVDF-to-PVA ratio of 90:10 due to its excellent mechanical, morphological, and hydrophilicity conductivity properties. Fourier transform infrared (FTIR) spectroscopy verified strong hydrogen bonding interaction formed between the fluorine group of PVDF with oxygen-containing in the hydroxyl group of PVA. In-vitro cell culture showed that the enhanced hydrophilic property of electrospun PVDF/PVA could significantly enhance the cell growth. These positive results indicated that the scaffold could be implemented as artificial tissue material for tissue engineering applications. ABSTRAK: Polivinilidena fluorida (PVDF) adalah bahan piezoelektrik yang biasa digunakan dalam kejuruteraan tisu kerana potensinya menyerupai keadaan persekitaran mikro-elektrik biologi bagi perkembangan tisu. Dalam penyelidikan ini, polivinil alkohol (PVA) diperkenalkan ke dalam fabrikasi pintalan-elektro PVDF melalui proses pemintalan-elektro, yang bertujuan bagi mengembangkan sifat biokompatibiliti membran nanogentian dengan meningkatkan sifat hidrofilik bagi menjadi perancah tisu tiruan. Membran pintalan-elektro PVDF / PVA didapati optimum pada nisbah PVDF-ke-PVA, 90:10 kerana sifat kekonduksian, mekanikal, morfologi dan hidrofiliknya yang sangat baik. Spektroskopi transformasi inframerah Fourier (FTIR) mengesahkan interaksi ikatan hidrogen yang kuat terbentuk antara kumpulan fluoro PVDF dengan oksigen yang terkandung dalam kumpulan hidroksil PVA. Kultur sel secara in-vitro menunjukkan bahawa sifat hidrofilik pintalan-elektro PVDF / PVA dapat meningkatkan pertumbuhan sel secara signifikan. Hasil positif ini menunjukkan bahawa perancah ini dapat digunakan sebagai bahan tisu buatan bagi aplikasi kejuruteraan tisu.
Dissertations / Theses on the topic "Polyvinyl alkohol"
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Másilko, Jiří. "Syntéza vysokopevnostních kompozitů na bázi anorganického cementu a polymeru." Doctoral thesis, Vysoké učení technické v Brně. Fakulta chemická, 2012. http://www.nusl.cz/ntk/nusl-233354.
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The subject of the doctoral thesis is the study of moisture resistance of macro-defect-free (MDF) composites based on calcium-aluminate cement and polyvinylalcohol used as polymer. MDF cements are perspective materials providing unique properties relative to traditional cement pastes with great potential to incoming constructional utilization. But it is known that MDF cements exhibit sensitivity to water, with swelling and reduction of strength. Therefore the work is aimed in monitoring of an organic polymer effect on the moisture resistance of MDF materials and phase changes. The effects of three different organotitanate cross-linking agents on the properties were investigated. The organotitanate-modified MDF cement samples exhibited improved moisture resistance as compared to the standard samples when exposed to 100 % relative humidity or water at laboratory conditions. The influence of composition at different curing on the properties of model MDF cement samples was observed. The characterization of MDF samples was based especially on test of flexural strength, XRD, DTA/TGA and EGA, EDS and scanning electron microscopy analyses.