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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
Ba, CY; Yang, J; Hao, QH; Liu, XY; Cao, A
2003-11-01
Source PublicationBIOMACROMOLECULES
ISSN1525-7797
Volume4Issue:6Pages:1827-1834
AbstractThis study presents chemical syntheses and physical characterization of a new aliphatic 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 functional groups were synthesized through melt polycondensation from succinic acid and 1,4-butanediol. Further, 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 ((M) over bar (n) = 4.9 KDa) 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 macromolecular structures and physical properties were intensively studied for these synthesized PBS prepolymer and PLLA-b-PBS-b-PLLA triblock copolyesters. C-13 NMR and GPC experimental results confirmed the formation of sequential block structures without 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 single glass transitions, and their glass transition temperatures 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 of 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 assemblied PLLA and PBS crystal structures when the average PLLA block length became larger than 7.8. These results may be beneficial for this new biodegradable aliphatic triblock copolyester to be applied as a potential biomaterial.
DOI10.1021/bm034235p
Indexed BySCI
Language英语
WOS IDWOS:000186729700048
PublisherAMER CHEMICAL SOC
Citation statistics
Cited Times:56[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/80328
Collection中国科学院化学研究所
Corresponding AuthorCao, A
AffiliationChinese Acad Sci, Shanghai Inst Organ Chem, Polymer Mat Lab, Shanghai 200032, Peoples R China
Recommended Citation
GB/T 7714
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.
APA Ba, CY,Yang, J,Hao, QH,Liu, XY,&Cao, A.(2003).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.BIOMACROMOLECULES,4(6),1827-1834.
MLA Ba, CY,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".BIOMACROMOLECULES 4.6(2003):1827-1834.
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