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学科主题: 高分子化学
题名: Syntheses and physical characterization of new aliphatic triblock poly(l-lactide-b-butylene succinate-b-L-lactide)s bearing soft and hard biodegradable building blocks.
其他题名: 新性脂肪族三嵌段共聚物 PLLA-PBS-PLLA的合成与物理表征
作者: Ba CY(巴朝义) ; Yang J(杨晶) ; Hao QH(郝庆辉) ; Liu XY(刘小云) ; Cao AM(曹阿民)
通讯作者: 曹阿民
刊名: Biomacromolecules
发表日期: 2003-01-01
卷: 4, 期:6, 页:1827-1834
收录类别: SCI
部门归属: 中国科学院上海有机化学研究所高分子材料研究室
英文摘要: This study presents chemical syntheses and physical characterization of a new alipbatic poly(L.-lactide-b- butylene succinate-b-L.-lactide) triblock copolyester with soft and hard biodegradable building blocks. First, poly(butylene succinate) (PBS) prepolymers terminated- with hydroxyl fnnctional groups were synthesized through melt polycondensation from succinic acid and 1,4-butanediol. Furher, a series of new PLLA-b-PBS-b-PLLA triblock copolyesters bearing various average PLLA block lengths were prepared via ring opening polymerization of L-lactide with the synthesized hydroxyl capped PBS prepolymer (Mn= 4.9KDa) and stannous octanoate as the macroinitiator and catalyst, respectively. By means of GPC, NMR, FTIR. DSC, TGA, and wide-angle X-ray diffractometer (WAXD), the Inacromolecular structures and physical properties were intensively studied for these synthesized PBS prepolymer and PLLA-b-PBS-b-PLLA triblock copolyesters. 13C NMR and GPC experimental results conffrmed the formation of sequential block structures wiblout any detectable transesterification under the present experimental conditions, and the molecular weights of triblock copolyesters could be readily regulated by adjusting the feeding molar ratio of L-lactide monomer to the PBS macroinitiator. DSC measurements showed all singls glass transitions, and their glass transition temoeratures were found to be between those of PLLA and PBS, depending on the lengths of PLLA blocks. It was noteworthy that the segmental flexibilities of the hard PLLA blocks were found to be remarkably enhanced by the more flexible PBS block partner, and the PBS and PLLA building blocks were well mixed in the amorphous regions. Results ot TGA analyses indicated that thermal degradation and stabilities of the PLLA blocks strongly depended on the average PLLA block lengths of triblock copolyesters. In addition, FTIR and WAXD results showed the coexistence of the assenmblied PLLA and PBS crystal strutures when the average PLLA block lenIgth became larger than 7.8. These results may be beneficial for this new hiondegradable aliphatic triblock copolyester to be applied as a potential biomaterial.
语种: 英语
相关网址: 查看原文
内容类型: 期刊论文
URI标识: http://ir.sioc.ac.cn/handle/331003/22884
Appears in Collections:高分子材料研究室_期刊论文

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Recommended Citation:
Ba CY,Yang J,Hao QH,et al. Syntheses and physical characterization of new aliphatic triblock poly(l-lactide-b-butylene succinate-b-L-lactide)s bearing soft and hard biodegradable building blocks.[J]. Biomacromolecules,2003,4(6):1827-1834.
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