Side chain dendritic polyurethanes with shape-memory effect
In this study, thermally reversible polyurethanes (PUs) with shape memory effect were developed by using hydrogen bonding to enhance physical interactions. Two different types of PUs were synthesized: (1) a linear PU whose hard segment consists of methylene di-para-phenyl isocyanate (MDI) and di(eth...
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| Veröffentlicht in: | Journal of materials chemistry 2009-01, Vol.19 (44), p.8484-8494 |
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| container_issue | 44 |
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| container_title | Journal of materials chemistry |
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| creator | TSAI, Cheng-Che CHANG, Chia-Cheng YU, Ching-Shiang DAI, Shenghong A WU, Tzong-Ming SU, Wen-Chiung CHEN, Chang-Nan CHEN, Franklin M. C JENG, Ru-Jong |
| description | In this study, thermally reversible polyurethanes (PUs) with shape memory effect were developed by using hydrogen bonding to enhance physical interactions. Two different types of PUs were synthesized: (1) a linear PU whose hard segment consists of methylene di-para-phenyl isocyanate (MDI) and di(ethylene glycol) (DEG); its soft segment is made of Tone 0260 polyol, a polyester polyol; (2) a side-chain dendritic PU which replaces DEG with different generations of dendritic chain extenders. By incorporation of the dendritic structure with peripheral long alkyl chains (strong van der Waals forces), the miscibility between hard and soft segments can be significantly improved. Consequently, the hydrogen bonding reinforced hard segments (malonamide linkages) of side chain dendritic PUs result in greatly enhanced mechanical properties and shape memory effect. During cyclic shape memory tests, one of the series can effortlessly achieve complete recovery in less than 10 second without any deficiency. |
| doi_str_mv | 10.1039/b910614f |
| format | Article |
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Consequently, the hydrogen bonding reinforced hard segments (malonamide linkages) of side chain dendritic PUs result in greatly enhanced mechanical properties and shape memory effect. 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Consequently, the hydrogen bonding reinforced hard segments (malonamide linkages) of side chain dendritic PUs result in greatly enhanced mechanical properties and shape memory effect. During cyclic shape memory tests, one of the series can effortlessly achieve complete recovery in less than 10 second without any deficiency.</description><subject>Condensed matter: structure, mechanical and thermal properties</subject><subject>Exact sciences and technology</subject><subject>Mechanical and acoustical properties of condensed matter</subject><subject>Mechanical properties of nanoscale materials</subject><subject>Physics</subject><issn>0959-9428</issn><issn>1364-5501</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2009</creationdate><recordtype>article</recordtype><recordid>eNo9kEtLxDAURoMoOI6CP6EbxU01aR5tcCWDLxhwoa5LcnNDI32ZdJD-e2eY0dW3ORw-DiGXjN4yyvWd1YwqJvwRWTCuRC4lZcdkQbXUuRZFdUrOUvqilLFSyQW5fw8OM2hM6DOHvYthCpCNQztvIk6N6TFlP2FqstSYEfMOuyHOGXqPMJ2TE2_ahBeHXZLPp8eP1Uu-fnt-XT2sc-C0mnIlSslFWZTWClkAoNCgLMoSrbYApXfAQfHKVEpozZXjTkldWOq1QOscX5LrvXeMw_cG01R3IQG27fbdsEk1VwVTpSy24M0ehDikFNHXYwydiXPNaL2rU__V2aJXB6dJYFofTQ8h_fPFzsgU5b9XtmQr</recordid><startdate>20090101</startdate><enddate>20090101</enddate><creator>TSAI, Cheng-Che</creator><creator>CHANG, Chia-Cheng</creator><creator>YU, Ching-Shiang</creator><creator>DAI, Shenghong A</creator><creator>WU, Tzong-Ming</creator><creator>SU, Wen-Chiung</creator><creator>CHEN, Chang-Nan</creator><creator>CHEN, Franklin M. 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C</au><au>JENG, Ru-Jong</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Side chain dendritic polyurethanes with shape-memory effect</atitle><jtitle>Journal of materials chemistry</jtitle><date>2009-01-01</date><risdate>2009</risdate><volume>19</volume><issue>44</issue><spage>8484</spage><epage>8494</epage><pages>8484-8494</pages><issn>0959-9428</issn><eissn>1364-5501</eissn><abstract>In this study, thermally reversible polyurethanes (PUs) with shape memory effect were developed by using hydrogen bonding to enhance physical interactions. Two different types of PUs were synthesized: (1) a linear PU whose hard segment consists of methylene di-para-phenyl isocyanate (MDI) and di(ethylene glycol) (DEG); its soft segment is made of Tone 0260 polyol, a polyester polyol; (2) a side-chain dendritic PU which replaces DEG with different generations of dendritic chain extenders. By incorporation of the dendritic structure with peripheral long alkyl chains (strong van der Waals forces), the miscibility between hard and soft segments can be significantly improved. Consequently, the hydrogen bonding reinforced hard segments (malonamide linkages) of side chain dendritic PUs result in greatly enhanced mechanical properties and shape memory effect. During cyclic shape memory tests, one of the series can effortlessly achieve complete recovery in less than 10 second without any deficiency.</abstract><cop>Cambridge</cop><pub>Royal Society of Chemistry</pub><doi>10.1039/b910614f</doi><tpages>11</tpages></addata></record> |
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| ispartof | Journal of materials chemistry, 2009-01, Vol.19 (44), p.8484-8494 |
| issn | 0959-9428 1364-5501 |
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| source | Royal Society Of Chemistry Journals 2008-; Alma/SFX Local Collection |
| subjects | Condensed matter: structure, mechanical and thermal properties Exact sciences and technology Mechanical and acoustical properties of condensed matter Mechanical properties of nanoscale materials Physics |
| title | Side chain dendritic polyurethanes with shape-memory effect |
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