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亚磷酸三苯酯扩链制备高分子量聚乳酸 被引量:11

Synthesis of High Molecular Weight Poly(L-Lactic Acid) by TPPi Chain-Extending
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摘要 以L-乳酸为原料,通过熔融缩聚法制备了分子量较低的聚L-乳酸(PLLA),采用亚磷酸三苯酯(TPPi)为扩链剂对其扩链增粘,研究了TPPi用量和反应时间对产物分子量的影响,得到了M-η为18.6万的高分子量PLLA,由13C-NMR和[α]25可证实其分子结构在扩链前后基本一致。DSC结果显示扩链后产物的熔点和结晶度与扩链前产物相近,TGA表明扩链后产物热稳定性增强。 The poly( L-lactic acid) (PLLA) was synthesized through melt polycondensation from L- lactic acid. The chain-extending reaction of PLLA with triphenyl phosphite (TPPi) was studied. After the chain-extending the PLLA which has a viscosity average molecular weight (M^-η) over 18.6 × 10^4 can be attained in the optimal reaction. The 13C-NMR and [α]z5 prove that the PLLA's molecular structure is kept after the reaction. DSC and TGA results show that the final products are semierystallizabiliity and have good thermal stability.
出处 《高分子材料科学与工程》 EI CAS CSCD 北大核心 2008年第1期20-23,共4页 Polymer Materials Science & Engineering
基金 科技部国际科技合作计划项目(2004DFBA0009)
关键词 聚乳酸 熔融缩聚 扩链 亚磷酸三苯酯 poly(L-lactic acid) melt polycondensation chain-extending triphenyl phosphate
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