Article(id=1242117159132926668, tenantId=1146029695717560320, journalId=1146031591421210625, issueId=1242117113696031283, articleNumber=null, orderNo=null, doi=null, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1240761600000, receivedDateStr=2009-04-27, revisedDate=1249315200000, revisedDateStr=2009-08-04, acceptedDate=null, acceptedDateStr=null, onlineDate=1252771200000, onlineDateStr=2009-09-13, pubDate=1252771200000, pubDateStr=2009-09-13, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1252771200000, onlineIssueDateStr=2009-09-13, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1774073408153, creator=sys-migrate, updateTime=1774073408153, updator=sys-migrate, issue=Issue{id=1242117113696031283, tenantId=1146029695717560320, journalId=1146031591421210625, year='2009', volume='27', issue='0917', pageStart='3', pageEnd='140', issueExtLink='null', onlineDate='null', pubDate='1252771200000', pubDateStr='2009-09-13', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=3, issueType=-1, specialIssue=null, createTime=1774073397321, creator='sys-migrate', updateTime=1774073397321, updator='sys-migrate', preIssue=null, nextIssue=null, articleTotal=null, ext=null, issueFiles=null, downloadFileDto=null}, startPage=106, endPage=110, ext={EN=ArticleExt(id=1242117162966516061, articleId=1242117159132926668, tenantId=1146029695717560320, journalId=1146031591421210625, language=EN, title=Research Advance of Synthesis and Modification of Polylactic Acid, columnId=1242116810380743325, journalTitle=Science & Technology Review, columnName=Reviews, runingTitle=null, highlight=null, articleAbstract=Polylactic acid is a widely used biodegradable material, which, together with its copolymers, are now among the most important biomedical materials. There are two main methods for synthesizing homopolymer of lactic acid: the ring-opening polymerization and the direct polycondensation. The direct polycondensation method includes the direct melt polycondensation and the solution polycondensation. In accordance with the reaction mechanism, the ring-opening polymerization includes the anionic ring-opening polymerization, the cationic ring-opening polymerization and the ring-opening polymerization of coordination. In this paper, the polymerization mechanism and the research progress of different polymerization methods are discussed. The high cost in synthesizing lactic acid homopolymer, the low molecular weight of products and its hydrophobic, brittle performance have limited its applications. The current study of polylactic acid is mainly concentrated in the modification. The latest research progress on chemical and physical modifications are reviewed, such as copolymerization, cross-linking, surface modification, blends, fiber composites and so on. Synthesis and modification of polylactic acid are discussed. Synthesis conditions should be improved. Non-toxic or low-residue catalysts should be used., authors=null, authorsList=null, authorCompany=null, correspAuthors=null, authorNote=null, correspAuthorsNote=null, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=eIbC49MU8nDxAL8lI8hMtA==, pdfFileSize=678845, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1242117160512852703, articleId=1242117159132926668, tenantId=1146029695717560320, journalId=1146031591421210625, language=CN, title=聚乳酸的合成和改性研究进展, columnId=1242116809164390686, journalTitle=科技导报, columnName=综述文章, runingTitle=null, highlight=null, articleAbstract=聚乳酸类材料是一种用途广泛的生物降解高分子材料，已经成为生物医用材料中最受重视的材料之一。乳酸均聚物的合成主要有两种方法：丙交酯开环聚合法和直接缩聚法。直接缩聚法包括溶液缩聚和熔融缩聚；按照反应机制，开环聚合法包含阴离子型开环聚合、阳离子型开环聚合和配位开环聚合。本文讨论了各种聚合方法的机制和研究进展。由于乳酸均聚物合成的成本高，产物分子量低及其疏水性、脆性等性能缺陷，限制了其应用范围，目前对聚乳酸的研究主要集中在改性上，本文详细介绍了共聚、交联、表面修饰等化学改性方法和共混、增塑、纤维复合等物理改性方法的最新研究进展。并对聚乳酸的合成及改性的研究方向进行了展望，改进聚乳酸的合成工艺条件，使用无毒或低残留量的催化剂；用新材料对聚乳酸进行改性，在克服原有缺点的基础上开发出新用途的聚乳酸材料。, authors=陈佑宁¹,樊国栋²,张知侠¹,党西妹¹, authorsList=陈佑宁;樊国栋;张知侠;党西妹, authorCompany=1. 咸阳师范学院化学与化工学院，陕西咸阳 7120002. 陕西科技大学化学与化工学院，西安 710021, correspAuthors=null, authorNote=null, correspAuthorsNote=陈佑宁, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=E7BjhcO34w+TyjdEpR4GLA==, pdfFileSize=678845, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null)}, authors=null, 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