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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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1,3-PBO扩链改性端羧基聚乳酸的性能表征
DOI: 10.3724/SP.J.1105.2012.11272, PP. 14-18
Keywords: 聚乳酸,羧基封端,双噁唑啉,扩链,直接熔融缩聚
Abstract:
以乳酸为原料、辛酸亚锡为催化剂,采用梯度升温法,在170℃、0.098MPa条件下直接熔融缩聚合成端羧基共聚物P(LA/SA).将其用2,2-(1,3-亚苯基)-二噁唑啉(1,3-PBO)扩链,按n(—COOH)/n(—oxazoline)=1∶1.4比例加入1,3-PBO,在150℃,0.098MPa条件下反应15min制得聚酰胺酯(PEA).采用GPC、FTIR、1H-NMR、DSC、XRD、TGA、SEM等手段对聚合物的结构进行了表征和性能测试.结果表明,与P(LA/SA)相比,扩链产物相对分子质量大幅度提高,重均分子量达36×104;产物Tg比PLA升高,材料的刚性增强;产物热稳定性能提高,为一步分解;产物结晶度较P(LA/SA)降低,其柔韧性较P(LA/SA)增强,但相对于PLA有所降低.
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