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Dissertations / Theses on the topic 'Rubber latex'

Author: Grafiati

Published: 4 June 2025

Last updated: 1 August 2025

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1

Said, M. M. "Peroxide prevulcanization of natural rubber latex." Thesis, London Metropolitan University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233004.

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The peroxide prevulcanization of NR latex using a range of commercially-available organic peroxides and an inorganic peroxide (potassium peroxydisulphate), in both activated and non-activated systems, has been investigated. A range of reducing agents and compounds that are known to promote peroxide-initiated emulsion polymerization and peroxide curing of po1yesters have been evaluated as promoters for the peroxide prevulcanization of NR latex. A few reactive peroxyesters have been found to be effective as prevulcanizing agents at temperatures in the range 80 °C-lOO °C. the effectiveness of the

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2

Smeaton, Jacqueline. "Study of postvulcanisation of natural rubber latex films." Thesis, Loughborough University, 1998. https://dspace.lboro.ac.uk/2134/6985.

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Tensile strength-modulus relationships established for postvulcanised latex films have been found to show characteristics of both prevulcanised latex and dry rubber curves. The curves depend upon the accelerator system used, as with dry rubber. They passed through their maxima after which tensile strength fell, with the down-turn less pronounced than for prevulcanised latex but greater than for dry rubber. The results suggest that postvulcanised latex films remain particulate rather than homogeneous. Processes known to affect prevulcanised latex films were applied to postvulcanised latex films

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3

Tabe, J. O. "Synthesis and characterisation of composite latex particles based on a natural rubber latex." Thesis, Lancaster University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.268115.

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4

Jaafar, Rosly. "Ultrasonic non-destructive evaluation of natural rubber latex suspensions." Thesis, Keele University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318988.

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This thesis describes the development of wide bandwidth ultrasonic pulse transmission and pulse echo comparison spectrometer methods to measure the ultrasonic phase velocity and absorption in natural rubber latex. Details of the quantitative design and construction of simple prototype test rigs include the mechanism of: variable path length pulse transmission, variable path length reflected pulse echo, and dual transducers reflected pulse echo. Special signal processing of experimental data, including transducer impulse response correction routines to calculate the acoustical parameters, are o

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5

Shantha, Walpalage. "Study of the influence of membrane structure and permeation conditions on the efficiency of separation of miscible liquid mixtures by pervaporation." Thesis, University of East London, 2000. http://roar.uel.ac.uk/3577/.

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Pervaporation separation of aqueous ethanol solution has, for the first time ever, been investigated with natural rubber latex (NRL) base membranes which contained a hydrocolloid as a blend ingredient. Three different hydrocolloids viz. methyl cellulose, carboxy methyl cellulose (sodium salt) and alginic acid (sodium salt) of low or medium or high molecular mass were used and tested. The weight percent of a hydrocolloid in the blended layer of a membrane has been varied from 1.25 to 20 on a dry rubber basis. The composition of ethanol in the aqueous feed solution was varied within the range of

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6

Lin, Xingwang. "Hydrogenation of unsaturated polymers in latex form." Thesis, University of Waterloo, 2005. http://hdl.handle.net/10012/957.

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Diimide generated from the hydrazine/hydrogen peroxide/catalyst system can be used to hydrogenate unsaturated polymers in latex form. As an economical and environmentally benign alternative to the commercial processes based on hydrogen/transition metal catalysts, this method is of special interest to industry. This thesis provides a detailed description of the diimide hydrogenation process. Reaction kinetics, catalysts and gel formation mechanism have been investigated. <br /> <br /> Four main reactions and a mass transfer process form three parallel processes in this system: diimi

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7

Bahari, Azlina. "Approaches to understanding diversity in rubber and carotenoid synthesis in Hevea brasiliensis latex." Thesis, University of Dundee, 2019. https://discovery.dundee.ac.uk/en/studentTheses/73b6fffb-faf0-4fb9-94f1-aa9bbb330154.

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<i>Hevea brasiliensis </i>latex contains a large quantity of high molecular weight rubber and is thus the primary commercial source of natural rubber. Rubber and other non-rubber isoprenoids in <i>Hevea </i>latex are synthesised from isopentenyl diphosphate (IPP) generated from the cytoplasmic mevalonate (MVA) pathway and the plastidic methyl erythritol phosphate pathway (MEP). This study utilised two rubber tree clones (RRIM600 and PB235) that show visibly contrasting levels of yellow carotenoids for the measurement of latex isoprenoids (carotenoids, rubber and isoprenoid intermediates) and t

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8

Yusof, Faridah. "Factors affecting the formation of rubber from isopentenyl pyrophosphate in Hevea brasiliensis latex." Thesis, University of Hertfordshire, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.361264.

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9

ARAUJO, SERGIO C. de. "Vulcanizacao do latex de borracha natural induzida com feixe de eletrons." reponame:Repositório Institucional do IPEN, 1993. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10327.

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10

Mat, Jamaludin. "Rubber modified bituminous mixtures : effects of natural rubber powders and latex on thin-pavement bituminous mixtures in repeated flexure." Thesis, University of Bradford, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.235633.

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11

Kalyani, N. M. V. "Effects of water-soluble polymers upon some properties of natural rubber latex." Thesis, London Metropolitan University, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.235882.

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An investigation of the effects of various water-soluble polymers upon some properties of natural rubber latex has been carried out. All the polymers, which were of two principal types, distinguished according to the rate of addition of polymerisation reactants, were prepared by free-radical initiated solution polymerisation. Two types of monomers, namely, ionisable hydrophilic monomers and hydrophobic monomers were used in the preparation of polymers. Both types of polymers, referred to as Type 1 and Type 2, were principally characterised by viscometry, hydrophilicity assessment and infra-red

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12

Agostini, Deuber Lincon da Silva [UNESP]. "Caracterização dos constituintes do látex e da borracha natural que estimulam a angiogênese." Universidade Estadual Paulista (UNESP), 2009. http://hdl.handle.net/11449/94503.

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Made available in DSpace on 2014-06-11T19:27:13Z (GMT). No. of bitstreams: 0 Previous issue date: 2009-04-30Bitstream added on 2014-06-13T18:31:06Z : No. of bitstreams: 1 agostini_dls_me_bauru.pdf: 3608842 bytes, checksum: 9f88482e6ed9f6d122b753891fe26c0a (MD5)<br>Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)<br>As membranas de borracha natural são usadas frequentemente como material biológico na indução de angiogênese e neoformação. Neste trabalho foram realizados estudos com objetivo de identificar os componentes do látex que são responsáveis pelo processo de angiogênese e

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13

Agostini, Deuber Lincon da Silva [UNESP]. "Estudo dos componentes não isoprênicos do látex de Hevea brasiliensis indutores de angiogênese." Universidade Estadual Paulista (UNESP), 2013. http://hdl.handle.net/11449/103766.

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Made available in DSpace on 2014-06-11T19:32:51Z (GMT). No. of bitstreams: 0 Previous issue date: 2013-07-05Bitstream added on 2014-06-13T18:44:19Z : No. of bitstreams: 1 agostini_dls_dr_bauru.pdf: 1803645 bytes, checksum: 1ba74c4c9393d0cd53d03478b6fe2f01 (MD5)<br>Atualmente é comprovado o poder de indução de angiogênese e neoformação tecidual através de membranas de borracha natural de Hevea brasiliensis. Este trabalho apresenta um estudo sobre as propriedades e a caracterização das frações não isoprênicas, separadas por centrifugação do látex, utilizado como biomaterial na indução de angio

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14

Agostini, Deuber Lincon da Silva. "Estudo dos componentes não isoprênicos do látex de Hevea brasiliensis indutores de angiogênese /." Bauru, 2013. http://hdl.handle.net/11449/103766.

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Orientador: Aldo Eloizo Job<br>Banca: Mariselma Ferreira<br>Banca: Ivan Helmuth Bechtold<br>Banca: José Antonio Malmonge<br>Banca: Eduardo René Perez<br>Resumo: Atualmente é comprovado o poder de indução de angiogênese e neoformação tecidual através de membranas de borracha natural de Hevea brasiliensis. Este trabalho apresenta um estudo sobre as propriedades e a caracterização das frações não isoprênicas, separadas por centrifugação do látex, utilizado como biomaterial na indução de angiogênese e de neoformação. As frações constituintes, F2 e F3 sem o tradicional agente estabilizante de hidro

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15

Intapun, Jutharat. "Study of the effects of biological maturation of coagula of hevea brasiliensis latex on dry rubber properties." Montpellier SupAgro, 2009. http://www.theses.fr/2009NSAM0036.

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The aim of this work was to study the maturation phenomena undergone bycup coagula of Hevea brasiliensis latex. The experimental strategy was to firstcharacterize the maturation industrial conditions (temperature, relative humidity andoxygen content of the air), secondly to reproduce this maturation at laboratory scale inorder to, thirdly, be able to study the effect of key determinants such as microbialpopulation or enzymatic activity on processed natural rubber properties. The maturation conditions of cup rubber coagula stored as a pile in anindustrial plant have been characterized. This req

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16

Linares, Elisangela Moura. "Caracterização microestrutural de filmes de blendas de latex." [s.n.], 2009. http://repositorio.unicamp.br/jspui/handle/REPOSIP/250299.

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Orientador: Fernando Galembeck<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Quimica<br>Made available in DSpace on 2018-08-14T14:09:30Z (GMT). No. of bitstreams: 1 Linares_ElisangelaMoura_M.pdf: 5164980 bytes, checksum: d9e4505544f0a48a985e78fccc9e1832 (MD5) Previous issue date: 2009<br>Resumo: Este trabalho mostra o efeito da distribuição de espécies iônicas na morfologia e nas propriedades mecânicas de filmes de blendas de látices, e também demonstra o uso da técnica de microscopia eletrônica de transmissão por energia filtrada (EFTEM) para caracterização mor

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17

Nguyen, Nhu Hien, and Thanh Thao Luong. "Situation of wastewater treatment of natural rubber latex processing in the Southeastern region, Vietnam." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-99176.

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Rubber tree is one of the main plants which play an important role in the economy of Southeastern region, Vietnam. Approximately 90% of Vietnamese natural rubber latex is exported as raw products. The preliminary process of natural rubber latex discharges a large amount of wastewater to the environment. In Vietnam, there are many available technologies set up and operated for treatment wastewater of rubber latex processing. However, the effluent quality is still poor and the concentration of pollutants is higher than the required national technical regulation on the effluent of the natural rub

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18

Romaine, Jennifer. "The synthesis, characterisation and properties of novel blends based on natural rubber latex." Thesis, Lancaster University, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.357029.

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19

Valadares, Leonardo Fonseca. "Nanocompositos de borracha natural e argila : preparação a partir de latex." [s.n.], 2005. http://repositorio.unicamp.br/jspui/handle/REPOSIP/250293.

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Orientador: Fernando Galembeck<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Quimica<br>Made available in DSpace on 2018-08-04T22:53:27Z (GMT). No. of bitstreams: 1 Valadares_LeonardoFonseca_M.pdf: 2704224 bytes, checksum: 7117cbcbd90ead01e5b79c4d6efb650a (MD5) Previous issue date: 2005<br>Mestrado<br>Físico-Química<br>Mestre em Química

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20

SOUZA, AUREA de. "Comportamento do AnB/KOH/HPt-B na vulcanizacao do latex de borracha natural induzida com raios gama." reponame:Repositório Institucional do IPEN, 1994. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10362.

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21

Bowland, Adam Gregory. "Comparison and Analysis of the Strength, Stiffness, and Damping Characteristics of Concrete with Rubber, Latex, and Carbonate Additives." Diss., Virginia Tech, 2011. http://hdl.handle.net/10919/28229.

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This dissertation presents the results of a study performed to investigate methods for increasing the damping capacity of concrete. A variety of additives, both particle and latex based, were added to standard concrete mixtures by replacing up to 20% of the fine aggregate to measure their effects on strength, stiffness, damping, and air content. The additives included rubber particles from recycled tires, calcium carbonate particles, styrene butadiene rubber (SBR) latex, and a commercially available product named ConcreDamp which contains vegetable gum suspended in styrene butadiene latex. A

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22

Dalimunthe, Rusdan. "Modification of natural rubber by graft copolymerisation of non-ionogenic hydrophilic monomers in latex." Thesis, London Metropolitan University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.290477.

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23

Rippel, Marcia Maria. "Caracterização microestrutural de filmes e particulas de latex de borracha natural." [s.n.], 2005. http://repositorio.unicamp.br/jspui/handle/REPOSIP/250323.

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Orientador: Fernando Galembeck<br>Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Quimica<br>Made available in DSpace on 2018-08-05T10:30:17Z (GMT). No. of bitstreams: 1 Rippel_MarciaMaria_D.pdf: 28336240 bytes, checksum: d54ace138d40b3edcabb2029aeef4d5e (MD5) Previous issue date: 2005<br>Doutorado<br>Físico-Química<br>Doutor em Ciências

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24

De, Beer Corena. "The role of occupational exposure in the development of latex hypersensitivity." Thesis, Cape Technikon, 2000. http://hdl.handle.net/20.500.11838/2240.

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Thesis (MTech (Biomedical Technology))--Cape Technikon, 2000.<br>Professionals in a healthcare setting use latex gloves on a daily basis, primarily to prevent transmission of microbial and viral organisms to and from patients and specimens. Repeated exposure to latex proteins (through direct skin contact or mucous membrane absorption) leads to the formation of circulating latex-specific antibodies and increases the risk of sensitisation. Among all known risk groups, healthcare workers have the highest risk to develop latex hypersensitivity. Early detection of antibodies or predisposing f

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25

Floriano, Juliana Ferreira [UNESP]. "Estudos sistemáticos de biocompatibilidade e potencial osteogênico de membranas bioativas em coelhos machos." Universidade Estadual Paulista (UNESP), 2013. http://hdl.handle.net/11449/103767.

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Made available in DSpace on 2014-06-11T19:32:51Z (GMT). No. of bitstreams: 0 Previous issue date: 2013-08-27Bitstream added on 2014-06-13T18:44:20Z : No. of bitstreams: 1 floriano_jf_dr_bauru.pdf: 1791628 bytes, checksum: 10858f1e0e11bad3d21b67fdd7617d79 (MD5)<br>O latéx ou Borracha natural (BN) oriundo da seringueira possui diversas características que o tornam uma excelente biomaterial que favorece o crescimento e reparação de tecidos, pele e ossos. Porém, a maioria das pesquisas encontradas na literatura com membranas da BN utiliza mistura de diferentes clones ou conservantes químicos, a

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26

CANAVEL, VALDIR. "Efeito do antioxidante e do radiosensibilizador na estabilidade do latex de borracha natural vulcanizada com raios gama." reponame:Repositório Institucional do IPEN, 1993. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10341.

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Floriano, Juliana Ferreira. "Estudos sistemáticos de biocompatibilidade e potencial osteogênico de membranas bioativas em coelhos machos /." Bauru, 2013. http://hdl.handle.net/11449/103767.

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Orientador: Carlos Frederico de Oliveira Graeff<br>Banca: Luis Augusto Sousa Marques da Rocha<br>Banca: Carlos Roberto Grandini<br>Banca: Mariselma Ferreira<br>Banca: Rondinelli Donizetti Herculano<br>Resumo: O latéx ou Borracha natural (BN) oriundo da seringueira possui diversas características que o tornam uma excelente biomaterial que favorece o crescimento e reparação de tecidos, pele e ossos. Porém, a maioria das pesquisas encontradas na literatura com membranas da BN utiliza mistura de diferentes clones ou conservantes químicos, a fim de evitar a coagulação da BN na coleta. Neste trabalh

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28

Collantes, Hugo David Chirinos. "Desenvolvimento do Processo de Fabricação de Tubos Hospitalares por RVNRL: Otimização e Protótipo de Extrusão a Baixas Temperaturas." Universidade de São Paulo, 1999. http://www.teses.usp.br/teses/disponiveis/85/85131/tde-06112003-182641/.

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O látex de borracha natural foi formulado, radiovulcanizado e, em seguida, estabilizado radioliticamente (GAMATEX), para ser empregado na fabricação de artefatos de borracha utilizados na área médica. A eficiência de reticulação do látex, quando radiovulcanizado com raios gama, correlacionou-se matematicamente com a razão de concentração do sistema de radiosensibilizador (x1 = [An-B] / [KOH]) e com a dose de vulcanização (x2), apresentando alto grau de interação, segundo o seguinte modelo matemático: , onde representa a resistência à tração na ruptura. O processo RVNRL foi otimizado para ba

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MARTINS, CARLOS F. P. "Estudo da biodegradabilidade e envelhecimento de filmes de borracha obtidos por processos de vulcanização do látex por radiação induzida de fonte gama." reponame:Repositório Institucional do IPEN, 2005. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11262.

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Wroe, Sarah. "The recycling of resorcinol formaldehyde latex coated nylon 66." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/the-recycling-of-resorcinol-formaldehyde-latex-coated-nylon-66(6b849427-03d1-4b81-b50a-df9d45f45e04).html.

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The Waste (England and Wales) Regulations encourage business to recycle their waste, as an alternative to landfill. This study has evaluated a number of processing techniques with respect to a difficult to recycle, technical textile, in order to develop recycling opportunities. Resorcinol formaldehyde latex (RFL) coated nylon 66 is a high performance fabric used as an interface to reinforce rubber products such as timing belts. The characteristics of the RFL coated woven fabric, assessed in comparison to equivalent uncoated fabrics, showed increased stiffness and decreased tear resistance. Thi

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Demer, Frank Robert 1961. "The impact of various cure parameters on the release of 4-phenylcyclohexene from carboxylated styrene-butadiene rubber latex." Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/277075.

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Research was initiated to examine the feasibility of removing the majority of 4-PCH from the XSBR latex employed in carpet manufacturing. The reduction of 4-PCH from such latices would lend insight into the control of certain carpet related illnesses.

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CAMPOS, VANIA E. "Avaliacao toxicologica de filmes de borracha natural obtido do latex vulcanizado pelo processo convencional e pelo processo alternativo com radiacao ionizante." reponame:Repositório Institucional do IPEN, 1997. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10654.

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Willis, Sean L. "Modification of natural rubber by using it as a seed latex for the polymerisation of vinyl monomers." Thesis, University of Birmingham, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.658082.

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Slutzky, Jessica Lauren. "Dipped Natural Rubber Latex Thin Films: Hypoallergenic Accelerator Formulations for Crosslinking, and Composites with Waste-Derived Fillers." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1557188601986261.

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Bellacicco, Sophie. "Etude de l’impact de l’origine clonale du latex d’Hevea brasiliensis sur la composition biochimique du latex et la mésostructure du caoutchouc naturel." Thesis, Montpellier, SupAgro, 2014. http://www.theses.fr/2014NSAM0003.

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Le caoutchouc naturel produit du latex d'Hevea brasiliensis a des propriétés remarquables qui n'ont jamais été égalées par ses homologues synthétiques. Toutefois, ce matériau d'origine naturel présente un désavantage : la variabilité non négligeable de ses propriétés. Cette dernière est partiellement attribuée aux 3 à 5 % de composés non isoprènes (lipides, protéines, sucres et minéraux) présents dans le caoutchouc naturel. Parmi les facteurs pouvant être tenus comme responsables de cette variabilité, l'origine clonale semble prépondérante. L'objectif principal de cette étude était d'évaluer l

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Salomez, Mélanie. "Etude du rôle des microorganismes dans les modifications biochimiques intervenant lors de la maturation des coagulums de latex d’Hevea brasiliensis : impact sur les propriétés du caoutchouc naturel sec." Thesis, Montpellier, SupAgro, 2014. http://www.theses.fr/2014NSAM0002.

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L'objectif général de cette thèse était d'étudier les mécanismes microbiens intervenant dans l'évolution de la structure et des propriétés du caoutchouc naturel produit à partir du latex d'Hevea brasiliensis lors de la maturation du latex et des coagula de tasse. Pour cela, trois niveaux d'analyses ont été réalisés sur des expériences de maturation en conditions contrôlées : analyse de la structure et des propriétés du caoutchouc sec, analyse des flores microbiennes et analyses biochimiques. Après une phase de mises au point méthodologiques permettant notamment d'optimiser les conditions de ma

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Musigamart, Natedao. "Study of the role of lipids from maturated coagula from Hevea brasiliensis latex on natural rubber behavior in oxidative conditions." Thesis, Montpellier, SupAgro, 2015. http://www.theses.fr/2015NSAM0004/document.

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Le caoutchouc naturel (CN), un produit dérivé du latex d'Hevea brasiliensis, est connu pour ses propriétés mécaniques supérieures pour certaines à celles de ses concurrents synthétiques. Néanmoins, le haut degré d'insaturation du poly(cis-1,4-isoprene) le rend susceptible à la thermo-oxydation. Heureusement, le CN est doté de composés non-isoprènes dont certains ont des propriétés antioxydantes. Les lipides sont les plus importants non-isoprènes retenus dans le caoutchouc et contiennent des molécules à activité antioxydante en particulier les tocotriènols. Il est connu que durant la maturation

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TOMIMASU, SUMIE. "Desenvolvimento de material simulador de tecido humano a partir do latex de borracha natural vulcanizado com radiacao gama." reponame:Repositório Institucional do IPEN, 2000. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10879.

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TAGLIARO, IRENE. "NOVEL COLLOIDAL APPROACH TO PREPARE HIGHLY-LOADED SILICA-BASED ELASTOMERIC NANOCOMPOSITES." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2019. http://hdl.handle.net/10281/241175.

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L’industria degli pneumatici si prefigge di indagare possibili strategie sintetiche per ridurre l’impatto ambientale durante tutto il ciclo di vita dello pneumatico, attraverso l’uso di materiali sostenibili e lo sviluppo di tecniche innovative che riducano il consumo di energia e le emissioni di CO2. In questo contesto, questa progetto di dottorato è focalizzato sulla preparazione di nanocompositi eco-sostenibili attraverso l’uso di un approccio colloidale per aumentare la dispersione di filler idrofilici, in linea con i nuovi requisiti di sostenibilità delle politiche europee. L’approccio

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Junior, Tadeu Evandro Mendes. "Análise do decaimento de força dos elásticos ortodônticos intermaxilares." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/23/23151/tde-30092016-165040/.

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Os elásticos ortodônticos intermaxilares são dispositivos auxiliares importantes para o tratamento ortodôntico. Os objetivos dessa pesquisa foram: comparar a intensidade de força dos elásticos informada pelos fabricantes com a força após estiramento de três vezes o diâmetro interno e avaliar o decaimento de força dos elásticos ortodônticos de várias empresas comerciais (Uniden, Morelli, Orthometric, Aditek, Rocky Mountain, TP Orthodontics e GAC Dentsply) de quatro tamanhos diferentes de diâmetro interno (1/8\"; 3/16\"; 1/4\" e 5/16\") com intensidade de força leve e média. Para esta pesquisa f

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Zhang, Yi. "Identification des gènes impliqués dans la production et la détoxication des espèces activées de l'oxygène chez Hevea brasiliensis et leur caractérisation dans le latex." Thesis, Montpellier, 2018. http://www.theses.fr/2018MONTG004/document.

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Hevea brasiliensis, un arbre tropical, est la source principale de caoutchouc naturel commercialement viable. La biosynthèse de caoutchouc se passe dans les cellules spécialisées appelées laticifères. Il représente jusqu’à 90% de la matière sèche du latex. Le latex, laiteux, s’écoule de l’encoche faite sur l’écorce de l’arbre jusqu’aux cellules laticifères. La collecte de latex, faite par saignée régulière tous 2-3 jours, est vraiment stressante pour l’arbre. Pour stimuler la production de latex, un générateur d’éthylène peut être appliqué sur le panneau de saignée. Le stress s’intensifie avec

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Barros, Natan Roberto de [UNESP]. "Estudo da incorporação e liberação de peptídeos hormonais utilizando membranas de látex natural como carreador." Universidade Estadual Paulista (UNESP), 2016. http://hdl.handle.net/11449/136323.

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CHIRINO, COLLANTES HUGO D. "Desenvolvimento do processo de fabricacao de tubos hospitalares por RVNRL .Otimizacao e prototipo de extrusao a baixas temperaturas." reponame:Repositório Institucional do IPEN, 1999. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10781.

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Made available in DSpace on 2014-10-09T12:43:56Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T14:09:00Z (GMT). No. of bitstreams: 0<br>Tese (Doutoramento)<br>IPEN/T<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP

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Marcatto, Vinícius Assis. "Manufatura aditiva de scaffolds estruturados recobertos com látex para regeneração óssea /." Araraquara, 2020. http://hdl.handle.net/11449/192791.

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Orientador: Gustavo Franco Barbosa<br>Resumo: O desempenho de tecidos e órgãos de todo organismo vivo, fica naturalmente comprometido com o passar dos anos, e se faz necessário intervenções médicas para eventuais reconstituições ou reparações de tecidos acometidos e danificados por doenças ou lesões. Neste contexto, a Engenharia Tecidual tem trabalhado de maneira interdisciplinar nos campos das Engenharias, Biologia e Medicina, e tem trazido grandes evoluções e opções aos já difundidos transplantes e enxertos ósseos. Nesse âmbito, impulsionado pelas recentes aplicações da tecnologia da manufat

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Leforce, Mary Hall 1949. "Investigation of the effects of various cure parameters on the release of 4-phenylcyclohexene from carpet backed with styrene-butadiene rubber latex." Thesis, The University of Arizona, 1991. http://hdl.handle.net/10150/277857.

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The effects of cure time, cure temperature, and air circulation on the release of 4-phenylcyclohexene (4-PCH) in tufted carpet backed with carboxylated styrene-butadiene rubber (SBR) latex were examined in this research project. 4-PCH is a suspect cause of certain "building-related" illnesses such as headache, upper respiratory and eye irritation, and fatigue. A standardized method for preparing carpet backed with SBR latex and analyzing its 4-PCH content was developed. The cure parameters investigated included three cure temperatures (225, 250 and 275°F), six cure times (0, 5, 10, 20, 40 and

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Subsorn, Panida. "An investigation into short term latex pricing and national production forecasting decision support system for the public agricultural rubber industry in Thailand." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2010. https://ro.ecu.edu.au/theses/1834.

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Decision support systems (DSS) are used to support efficient and effective decision making in many circumstances such as forecasting, managing problems and analysing data. Although used globally in the agricultural, public, government and business sectors, DSS are yet to be adopted within the public agricultural rubber industry in Thailand (PARIT). As PARIT is a significant economic growth area in Thailand, it provides an applied setting for this study; a setting in which the objectives of the National Economic and Social Development Plan (Issue 10) for Thailand must apply. PARIT’s policy make

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Mutepe, Rendani Daphney. "Investigation of Guayule's Agronomic Performance and Agro-processing in South Africa." University of the Western Cape, 2017. http://hdl.handle.net/11394/6323.

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Philosophiae Doctor - PhD (Biotechnology)<br>Guayule (Parthenium argentatum) is grown for its high quality hypoallergenic natural rubber latex production. The plant is native to the Chihuahua desert of North America and successful trials have been done in Europe, the United States of America (USA) and the Republic of South Africa (RSA). It is already undergoing industrial scale development in the USA producing good quality rubber products with impressive stretchiness and strength. The performance of guayule lines AZ1, AZ2, AZ3, AZ4, AZ5, AZ6, OSU1, and 11591 was investigated in the Eastern and

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Baudoin, Marion. "Impact de la taille des particules de caoutchouc du latex d’Hevea brasiliensis sur leurs propriétés aux interfaces fluides et en feuilles de caoutchouc sec." Electronic Thesis or Diss., Université de Rennes (2023-....), 2024. http://www.theses.fr/2024URENS038.

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Cette thèse vise à approfondir notre compréhension du processus de coagulation des deux catégories de taille de particules de caoutchouc issues du latex d’Hevea brasiliensis et à établir un lien avec les propriétés mécaniques du caoutchouc final. L’originalité réside dans une approche multi-échelle et pluridisciplinaire, englobant l’analyse des particules natives et de leur auto-organisation à l’état liquide, ainsi que les propriétés mécaniques des films secs sous forme de feuilles de caoutchouc (mini ADS). L’étude a été menée sur deux tailles de particules provenant des clones, RRIM600 et PB2

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Filho, Henrique José Servolo. "Avaliação da resistência à tração de couro vegetal de tecido de algodão impregnado com látex de cinco cultivares de seringueira (Hevea spp.) e vulcanizado." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/11/11136/tde-02102006-154140/.

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O couro vegetal é obtido através do revestimento de tecido de fibras celulósicas com látex de campo ou concentrado, extraído de seringueira (Hevea spp.). A produção do couro vegetal já ocorre atualmente, possibilitando manter os seringueiros da região norte do Brasil em sua atividade com melhor valor agregado ao produto, sendo ainda submetido ao processo de vulcanização associado à defumação. Adicionalmente, dá ao produtor de seringueira possibilidade de agregar valor ao seu produto e cria alternativa de matéria-prima com padrão de qualidade para a indústria da moda que trabalha exclusivamente

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Tsutsumoto, Nayra Yumi. "Avaliação do comportamento estrutural de vigas de concreto armado com taliscas de bambu reforçadas nos nós /." Ilha Solteira, 2016. http://hdl.handle.net/11449/144273.

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Orientador: José Luiz Pinheiro Melges<br>Resumo: O bambu é uma planta renovável, perene, tropical e que apresenta uma série de vantagens, tais como: crescimento rápido, elevada resistência mecânica, grande versatilidade, beleza, e não necessita do replantio de colmos. Certamente, fica evidente que o bambu é um material de grande potencial, para diversos setores, sobretudo da construção civil, em que o mesmo vem sendo utilizado desde os tempos mais remotos. Nas estruturas de concreto, o bambu tem sido estudado como um elemento passível de resistir aos esforços de tração. Entretanto, como desvan

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