DC Field | Value | Language |
---|---|---|
dc.contributor.author | Woo, Seong-Ihl | ko |
dc.contributor.author | KIM, BO | ko |
dc.contributor.author | JUN, HS | ko |
dc.contributor.author | Chang, Ho Nam | ko |
dc.date.accessioned | 2019-03-06T18:57:45Z | - |
dc.date.available | 2019-03-06T18:57:45Z | - |
dc.date.created | 2012-02-06 | - |
dc.date.issued | 1995-10 | - |
dc.identifier.citation | POLYMER BULLETIN, v.35, no.4, pp.415 - 421 | - |
dc.identifier.issn | 0170-0839 | - |
dc.identifier.uri | http://hdl.handle.net/10203/250725 | - |
dc.description.abstract | In order to synthesize the high molecular weight poly(lactic acid) [PLA], Hexamethylene diisocyanate [HDI] was used as a chain extender connecting the terminal group of polymers. Poly(lactic acid) of high molecular weight, 76000 (M(w)) and 33000 (M(n)), was obtained by using antimony trioxide catalyst after chain-extending with HDI. Without chain-extending, the molecular weight of PLA was about 7000 (M(n)). T-m in the 2nd-scan DSC thermogram was not found when PLA was chain-extended with HDI. In order to check the degree of crystallization of polymers, annealing of these polymers was carried out at 120 degrees C. Peaks of XRD (X-Ray Diffraction) were sharpened as the duration of annealing was lengthened. The analysis of polymers reacted with HDI by H-1-NMR showed the broad peaks at 1.32 and 3.14 ppm assigned to HDI units. The molecular weight of polymers increased with the increase in the mole ratio of -NCO/-OH. | - |
dc.language | English | - |
dc.publisher | SPRINGER VERLAG | - |
dc.subject | EPSILON-CAPROLACTONE | - |
dc.subject | POLYLACTONES | - |
dc.subject | MECHANISM | - |
dc.subject | LACTONES | - |
dc.title | POLYMERIZATION OF AQUEOUS LACTIC-ACID TO PREPARE HIGH-MOLECULAR-WEIGHT POLY(LACTIC ACID) BY CHAIN-EXTENDING WITH HEXAMETHYLENE DIISOCYANATE | - |
dc.type | Article | - |
dc.identifier.wosid | A1995RT07100005 | - |
dc.identifier.scopusid | 2-s2.0-0001326460 | - |
dc.type.rims | ART | - |
dc.citation.volume | 35 | - |
dc.citation.issue | 4 | - |
dc.citation.beginningpage | 415 | - |
dc.citation.endingpage | 421 | - |
dc.citation.publicationname | POLYMER BULLETIN | - |
dc.contributor.localauthor | Woo, Seong-Ihl | - |
dc.contributor.localauthor | Chang, Ho Nam | - |
dc.contributor.nonIdAuthor | KIM, BO | - |
dc.contributor.nonIdAuthor | JUN, HS | - |
dc.type.journalArticle | Article | - |
dc.subject.keywordPlus | EPSILON-CAPROLACTONE | - |
dc.subject.keywordPlus | POLYLACTONES | - |
dc.subject.keywordPlus | MECHANISM | - |
dc.subject.keywordPlus | LACTONES | - |
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