Recent advances in structural characterization of natural rubber
Structural characterization of rubber from Hevea brasiliensis (NR) has been carried out to elucidate the biosynthesis mechanism of rubber molecule as well as to find the relationship between physical properties characteristic of NR and its structure. Recent advances of structural studies have provid...
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th-mahidol.277632018-09-13T13:47:07Z Recent advances in structural characterization of natural rubber Yasuyuki Tanaka Lucksanaporn Tarachiwin The Institute of Science and Technology for Research and Development, Mahidol University Sumitomo Rubber (Thailand) Co. Materials Science Structural characterization of rubber from Hevea brasiliensis (NR) has been carried out to elucidate the biosynthesis mechanism of rubber molecule as well as to find the relationship between physical properties characteristic of NR and its structure. Recent advances of structural studies have provided a series of new information on the structure of long-chain branching based on the result of selective decomposition of branch-points by chemical and enzymatic treatments as well as physical treatment such as polar solvent treatments and washing of NR latex by centrifugation in the presence of a surfactant. The measurement of the resulting rubber with NMR, FTIR, SEC and dilute solution viscosity provided confirming evidence that the initiating terminal (ω-terminal) with an unidentified functional group and phosphate terminal (α-terminal) form branch-points by hydrogen bond, ionic bond or micelle formation of phospholipids linked to both terminal groups. Based on these results, the origin of green properties characteristic of NR has been explained and a new mechanism of storage hardening has been proposed. The purification method by saponification of NR latex developed for the structural characterization has been applied to produce purified NR latex free from Type I allergic reaction. Instantaneous coagulation of saponified latex by the use of a flocculant and formic acid has provided solid saponified NR having good green and cured rubber properties. 2018-09-13T06:47:07Z 2018-09-13T06:47:07Z 2009-01-01 Article Rubber Chemistry and Technology. Vol.82, No.3 (2009), 283-314 10.5254/1.3548250 00359475 2-s2.0-78650323415 https://repository.li.mahidol.ac.th/handle/123456789/27763 Mahidol University SCOPUS https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=78650323415&origin=inward |
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Materials Science Yasuyuki Tanaka Lucksanaporn Tarachiwin Recent advances in structural characterization of natural rubber |
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Structural characterization of rubber from Hevea brasiliensis (NR) has been carried out to elucidate the biosynthesis mechanism of rubber molecule as well as to find the relationship between physical properties characteristic of NR and its structure. Recent advances of structural studies have provided a series of new information on the structure of long-chain branching based on the result of selective decomposition of branch-points by chemical and enzymatic treatments as well as physical treatment such as polar solvent treatments and washing of NR latex by centrifugation in the presence of a surfactant. The measurement of the resulting rubber with NMR, FTIR, SEC and dilute solution viscosity provided confirming evidence that the initiating terminal (ω-terminal) with an unidentified functional group and phosphate terminal (α-terminal) form branch-points by hydrogen bond, ionic bond or micelle formation of phospholipids linked to both terminal groups. Based on these results, the origin of green properties characteristic of NR has been explained and a new mechanism of storage hardening has been proposed. The purification method by saponification of NR latex developed for the structural characterization has been applied to produce purified NR latex free from Type I allergic reaction. Instantaneous coagulation of saponified latex by the use of a flocculant and formic acid has provided solid saponified NR having good green and cured rubber properties. |
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The Institute of Science and Technology for Research and Development, Mahidol University |
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The Institute of Science and Technology for Research and Development, Mahidol University Yasuyuki Tanaka Lucksanaporn Tarachiwin |
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Yasuyuki Tanaka Lucksanaporn Tarachiwin |
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Yasuyuki Tanaka |
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Recent advances in structural characterization of natural rubber |
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Recent advances in structural characterization of natural rubber |
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Recent advances in structural characterization of natural rubber |
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Recent advances in structural characterization of natural rubber |
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Recent advances in structural characterization of natural rubber |
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recent advances in structural characterization of natural rubber |
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2018 |
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https://repository.li.mahidol.ac.th/handle/123456789/27763 |
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