Citation: Hui Zhen Zhao, Jian Yuan Hao, Cheng Dong Xiong, Xian Mo Deng. Different crystallinity of poly(d,l-lactide-co-p-dioxanone) copolymers acquired by control of chain microstructure[J]. Chinese Chemical Letters, ;2009, 20(12): 1506-1509. doi: 10.1016/j.cclet.2009.07.012 shu

Different crystallinity of poly(d,l-lactide-co-p-dioxanone) copolymers acquired by control of chain microstructure

a Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, China;
b School of Microeletronics and Solid State Electronics, University of Electronic Science and Technology of China, Chengdu 610054, China;
c Graduate School of Chinese Academy of Sciences, Beijing 100039, China

Received Date: 19 March 2009

Fund Project: This work was supported by the National Natural Sciences Fund of China (No.50603025) and the Opening Project of State Key Laboratory of Polymer Materials Engineering (Sichuan University).

Poly(d,l-lactide-co-p-dioxanone) (P(LA-co-PDO)) copolymers with different chain microstructures were synthesized by onestep or two-step bulk ring-opening polymerizations of d,l-lactide (LA) and p-dioxanone (PDO) monomers using stannous octoate [Sn(Oct)₂ ]/n-dodecanol as the initiating system.The average sequence lengths of the lactidyl (L_LA) and dioxanyl (L_PDO) units were calculated from the ¹H NMR spectra.It was found that both L_LA and L_PDO values from the two-step syntheses were significantly longer than those from the corresponding one-step syntheses, indicating more blocky structure achieved for the twostep copolymers.Corresponding to this difference in microstructure, the two-step copolymers were semi-crystalline, while the one-step copolymers were completely amorphous.In conclusion, the crystallinity of P(LA-co-PDO) copolymers could be adjusted conveniently to meet specific applications by changing the microstructure of the copolymers via different polymerization routes.
- Poly(d,l-lactide-co-p-dioxanone),
- Copolymerization,
- Chain microstructure,
- Crystallinity
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