Effect of Optical Purities on the Crystallization and Melting Behaviors of Poly(L-lactic acid)

doi:10.11944/j.issn.1000-0518.2016.08.150423

Chinese Journal of Applied Chemistry ›› 2016, Vol. 33 ›› Issue (8): 887-893.DOI: 10.11944/j.issn.1000-0518.2016.08.150423

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Effect of Optical Purities on the Crystallization and Melting Behaviors of Poly(L-lactic acid)

XIANG Sheng^a^b,SHAO Jun^c,FENG lidong^d,LI Gao^a^*(),CHEN Xuesi^a,BIAN Xinchao^a,LIU Fengqi^d

^a Key Laboratory of Polymer Ecomaterials,Changchun Institute of Applied Chemistry,Changchun 130022,China
^b University of Chinese Academy of Sciences,Beijing 100039,China
^c College of Chemistry and Chemical Engineering,Jiangxi Normal University,Nanchang 330022,China
^d College of Chemistry,Jilin University,Changchun 130012,China

Received:2015-11-30 Accepted:2016-02-29 Published:2016-07-21 Online:2016-07-21
Contact: LI Gao
Supported by:
Supported by the National Natural Science Foundation of China(No51303176, No.51403089, No.51573178)

Abstract

Abstract:

In both nonisothermal and isothermal treatments, crystallization and melting behaviors of poly(L-lactic acid)(PLLA) with different optical purities(91.6%, 93.3%, 94.0%, 97.0%, 98.4%) were investigated by differential scanning calorimetery(DSC) and wide-angle X-ray diffraction(WAXD).With the increase of optical purities of PLLA, the crystallization rate, the melting enthalpy, crystallization temperature and melting point increase. The Avrami index(n) is about 3, indicating a three-dimensional spherulitic growth on heterogeneous nuclei during the isothermal process. The crystalline structure of PLLA is independent on the variation of optical purities of PLLA. However, the critical temperature for crystal formation from δ-form to α-form crystals increases during the isothermal crystallization process with optical purities increasing of PLLA. All the results show that the crystallization and melting behaviors are dependent on the optical purities of PLLA.

Key words: poly(L-lactic acid), optical purity, crystallization

XIANG Sheng, SHAO Jun, FENG lidong, LI Gao, CHEN Xuesi, BIAN Xinchao, LIU Fengqi. Effect of Optical Purities on the Crystallization and Melting Behaviors of Poly(L-lactic acid)[J]. Chinese Journal of Applied Chemistry, 2016, 33(8): 887-893.

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Effect of Optical Purities on the Crystallization and Melting Behaviors of Poly(L-lactic acid)

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