Gel Structures of Natural Rubber and Synthetic Isoprene Rubber
The branching degree of natural rubber (NR) estimated by GPC/LALLS measurement is higher than that of synthetic isoprene rubber (IR). Branched polymer chains and the gel networks of NR are easily decomposed by various means such as mechanical force, solvent power and enzymic deproteinization reactio...
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| Veröffentlicht in: | KOBUNSHI RONBUNSHU 1989/08/25, Vol.46(8), pp.465-472 |
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| container_title | KOBUNSHI RONBUNSHU |
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| creator | SHIIBASHI, Toru HIROSE, Kazumasa TAGATA, Nobuo |
| description | The branching degree of natural rubber (NR) estimated by GPC/LALLS measurement is higher than that of synthetic isoprene rubber (IR). Branched polymer chains and the gel networks of NR are easily decomposed by various means such as mechanical force, solvent power and enzymic deproteinization reaction. This decomposition leads to the increase of linear polymer chains. 13CNMR spectrum of the low molecular weight fraction of NR gives small signals which are characteristics of an ester group. From these facts we estimate that the NR gel consists of weak linkages such as hydrogen bonds between an ester group in NR and an amino group in protein. Since the IR gel is formed by chemical bonds, it can be randomly decomposed only by mechanical force; this results in the increase of branched polymer chains. The gel structures of NR and IR are directly observed by transmission electron microscopy. The networks of NR gel show looser than those of IR gels. |
| doi_str_mv | 10.1295/koron.46.465 |
| format | Article |
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Branched polymer chains and the gel networks of NR are easily decomposed by various means such as mechanical force, solvent power and enzymic deproteinization reaction. This decomposition leads to the increase of linear polymer chains. 13CNMR spectrum of the low molecular weight fraction of NR gives small signals which are characteristics of an ester group. From these facts we estimate that the NR gel consists of weak linkages such as hydrogen bonds between an ester group in NR and an amino group in protein. Since the IR gel is formed by chemical bonds, it can be randomly decomposed only by mechanical force; this results in the increase of branched polymer chains. The gel structures of NR and IR are directly observed by transmission electron microscopy. The networks of NR gel show looser than those of IR gels.</description><identifier>ISSN: 0386-2186</identifier><identifier>EISSN: 1881-5685</identifier><identifier>DOI: 10.1295/koron.46.465</identifier><language>jpn</language><publisher>The Society of Polymer Science, Japan</publisher><subject>13C NMR ; Degree of Branching ; Deproteinization ; Electron Microscopy ; Gel Structure ; GPC ; Isoprene Rubber ; LALLS ; Mastication ; Natural Rubber ; Polyisoprene</subject><ispartof>KOBUNSHI RONBUNSHU, 1989/08/25, Vol.46(8), pp.465-472</ispartof><rights>The Society of Polymer Science, Japan</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c315t-bee1a036513f3693d364f7ad15466e01c8c824946ce4358a94936a4bc6c0f013</citedby></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,1877,27901,27902</link.rule.ids></links><search><creatorcontrib>SHIIBASHI, Toru</creatorcontrib><creatorcontrib>HIROSE, Kazumasa</creatorcontrib><creatorcontrib>TAGATA, Nobuo</creatorcontrib><title>Gel Structures of Natural Rubber and Synthetic Isoprene Rubber</title><title>KOBUNSHI RONBUNSHU</title><addtitle>KOBUNSHI RONBUNSHU</addtitle><description>The branching degree of natural rubber (NR) estimated by GPC/LALLS measurement is higher than that of synthetic isoprene rubber (IR). Branched polymer chains and the gel networks of NR are easily decomposed by various means such as mechanical force, solvent power and enzymic deproteinization reaction. This decomposition leads to the increase of linear polymer chains. 13CNMR spectrum of the low molecular weight fraction of NR gives small signals which are characteristics of an ester group. From these facts we estimate that the NR gel consists of weak linkages such as hydrogen bonds between an ester group in NR and an amino group in protein. Since the IR gel is formed by chemical bonds, it can be randomly decomposed only by mechanical force; this results in the increase of branched polymer chains. The gel structures of NR and IR are directly observed by transmission electron microscopy. The networks of NR gel show looser than those of IR gels.</description><subject>13C NMR</subject><subject>Degree of Branching</subject><subject>Deproteinization</subject><subject>Electron Microscopy</subject><subject>Gel Structure</subject><subject>GPC</subject><subject>Isoprene Rubber</subject><subject>LALLS</subject><subject>Mastication</subject><subject>Natural Rubber</subject><subject>Polyisoprene</subject><issn>0386-2186</issn><issn>1881-5685</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1989</creationdate><recordtype>article</recordtype><recordid>eNo9kEFLAzEQhYMoWGpv_oA9eXJrskmmyUWQUmuhKNjeQzadtavb3ZpkD_33bru18JgZeN8MzCPkntExy7R8-ml8U48FdJJXZMCUYqkEJa_JgHIFacYU3JJRCGVOqdSUaQoD8jzHKllF37rYegxJUyTvthttlXy2eY4-sfUmWR3quMVYumQRmr3HGs_uHbkpbBVwdO5Dsn6dradv6fJjvpi-LFPHmYxpjsgs5SAZLzhovuEgiondMCkAkDKnnMqEFuBQcKmsFpqDFbkDRwvK-JA89Gf3vvltMUSzK4PDqrI1Nm0wmcyyCZzAxx50vgnBY2H2vtxZfzCMmmNM5hSTEdBJdvisx79DtF94ga3vfq2wh5meiOOC-i_y4rut9QZr_gfQonOe</recordid><startdate>19890101</startdate><enddate>19890101</enddate><creator>SHIIBASHI, Toru</creator><creator>HIROSE, Kazumasa</creator><creator>TAGATA, Nobuo</creator><general>The Society of Polymer Science, Japan</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7SR</scope><scope>8FD</scope><scope>JG9</scope></search><sort><creationdate>19890101</creationdate><title>Gel Structures of Natural Rubber and Synthetic Isoprene Rubber</title><author>SHIIBASHI, Toru ; HIROSE, Kazumasa ; TAGATA, Nobuo</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c315t-bee1a036513f3693d364f7ad15466e01c8c824946ce4358a94936a4bc6c0f013</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>jpn</language><creationdate>1989</creationdate><topic>13C NMR</topic><topic>Degree of Branching</topic><topic>Deproteinization</topic><topic>Electron Microscopy</topic><topic>Gel Structure</topic><topic>GPC</topic><topic>Isoprene Rubber</topic><topic>LALLS</topic><topic>Mastication</topic><topic>Natural Rubber</topic><topic>Polyisoprene</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>SHIIBASHI, Toru</creatorcontrib><creatorcontrib>HIROSE, Kazumasa</creatorcontrib><creatorcontrib>TAGATA, Nobuo</creatorcontrib><collection>CrossRef</collection><collection>Engineered Materials Abstracts</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><jtitle>KOBUNSHI RONBUNSHU</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>SHIIBASHI, Toru</au><au>HIROSE, Kazumasa</au><au>TAGATA, Nobuo</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Gel Structures of Natural Rubber and Synthetic Isoprene Rubber</atitle><jtitle>KOBUNSHI RONBUNSHU</jtitle><addtitle>KOBUNSHI RONBUNSHU</addtitle><date>1989-01-01</date><risdate>1989</risdate><volume>46</volume><issue>8</issue><spage>465</spage><epage>472</epage><pages>465-472</pages><issn>0386-2186</issn><eissn>1881-5685</eissn><abstract>The branching degree of natural rubber (NR) estimated by GPC/LALLS measurement is higher than that of synthetic isoprene rubber (IR). Branched polymer chains and the gel networks of NR are easily decomposed by various means such as mechanical force, solvent power and enzymic deproteinization reaction. This decomposition leads to the increase of linear polymer chains. 13CNMR spectrum of the low molecular weight fraction of NR gives small signals which are characteristics of an ester group. From these facts we estimate that the NR gel consists of weak linkages such as hydrogen bonds between an ester group in NR and an amino group in protein. Since the IR gel is formed by chemical bonds, it can be randomly decomposed only by mechanical force; this results in the increase of branched polymer chains. The gel structures of NR and IR are directly observed by transmission electron microscopy. The networks of NR gel show looser than those of IR gels.</abstract><pub>The Society of Polymer Science, Japan</pub><doi>10.1295/koron.46.465</doi><tpages>8</tpages><oa>free_for_read</oa></addata></record> |
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| identifier | ISSN: 0386-2186 |
| ispartof | KOBUNSHI RONBUNSHU, 1989/08/25, Vol.46(8), pp.465-472 |
| issn | 0386-2186 1881-5685 |
| language | jpn |
| recordid | cdi_proquest_miscellaneous_25227601 |
| source | J-STAGE (Japan Science & Technology Information Aggregator, Electronic) Freely Available Titles - Japanese |
| subjects | 13C NMR Degree of Branching Deproteinization Electron Microscopy Gel Structure GPC Isoprene Rubber LALLS Mastication Natural Rubber Polyisoprene |
| title | Gel Structures of Natural Rubber and Synthetic Isoprene Rubber |
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