Fractionated Crystallization Kinetics and Polymorphic Homocrystalline Structure of Poly(<sub>L</sub>-lactic acid)/Poly(<sub>D</sub>-lactic acid) Blends: Effect of Blend Ratio

Wang-Kai Xiang; Qing Xie; Shan-Shan Xu; Chen-Xuan Sun; Cheng-Tao Yu; Ying Zheng; Peng-Ju Pan

doi:10.1007/s10118-022-2658-8

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Fractionated Crystallization Kinetics and Polymorphic Homocrystalline Structure of Poly(_L-lactic acid)/Poly(_D-lactic acid) Blends: Effect of Blend Ratio

RESEARCH ARTICLE | Updated：2022-05-24

- Fractionated Crystallization Kinetics and Polymorphic Homocrystalline Structure of Poly(_L-lactic acid)/Poly(_D-lactic acid) Blends: Effect of Blend Ratio
- Fractionated Crystallization Kinetics and Polymorphic Homocrystalline Structure of Poly(_L-lactic acid)/Poly(_D-lactic acid) Blends: Effect of Blend Ratio
- Chinese Journal of Polymer Science 2022年40卷第6期页码：567-575
- Affiliations：
  
  a.State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China
  b.Institute of Zhejiang University-Quzhou, Quzhou 324000, China
- Author bio：
  
  yzheng1@zju.edu.cn (Y.Z.)
  panpengju@zju.edu.cn (P.J.P.)
- Funds：
  
  This study was financially supported by the National Natural Science Foundation of China (No. 21873083). WAXD measurement were performed on the beamline BL16B1 of SSRF.
- DOI：10.1007/s10118-022-2658-8
  中图分类号：
- 收稿：2021-08-12，
  
  修回：2021-10-9，
  
  录用：2021-10-25，
  
  网络首发：2022-01-11，
  
  纸质出版：2022-06-01
- Accepted：
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Xiang, W. K.; Xie, Q.; Xu, S. S.; Sun, C. X.; Yu, C. T.; Zheng, Y.; Pan, P. J. Fractionated crystallization kinetics and polymorphic homocrystalline structure of poly(_L-lactic acid)/poly(_D-lactic acid) blends: effect of blend ratio. Chinese J. Polym. Sci. 2022, 40, 567–575 DOI: 10.1007/s10118-022-2658-8.

Wang-Kai Xiang, Qing Xie, Shan-Shan Xu, et al. Fractionated Crystallization Kinetics and Polymorphic Homocrystalline Structure of Poly(_L-lactic acid)/Poly(_D-lactic acid) Blends: Effect of Blend Ratio[J]. Chinese Journal of Polymer Science, 2022, 40(6): 567-575. DOI: 10.1007/s10118-022-2658-8.
Xiang, W. K.; Xie, Q.; Xu, S. S.; Sun, C. X.; Yu, C. T.; Zheng, Y.; Pan, P. J. Fractionated crystallization kinetics and polymorphic homocrystalline structure of poly(_L-lactic acid)/poly(_D-lactic acid) blends: effect of blend ratio. Chinese J. Polym. Sci. 2022, 40, 567–575 DOI: 10.1007/s10118-022-2658-8. DOI：

Wang-Kai Xiang, Qing Xie, Shan-Shan Xu, et al. Fractionated Crystallization Kinetics and Polymorphic Homocrystalline Structure of Poly(_L-lactic acid)/Poly(_D-lactic acid) Blends: Effect of Blend Ratio[J]. Chinese Journal of Polymer Science, 2022, 40(6): 567-575. DOI: 10.1007/s10118-022-2658-8. DOI：

摘要

Fractionated crystallization kinetics and polymorphic homocrystalline structure of asymmetric PLLA/PDLA blends are influenced by

and

. Crystallization of -HCs is favorable in the blends with high

at a low

which is attributed to the conformational matching between -HCs and SCs

and the constrained effects of precedingly-formed SCs.

Abstract

Stereocomplex (SC) crystallization has been an effective way to improve the physical performances of stereoregular polymers. However

the competition between homo and SC crystallizations can lead to more complicated crystallization kinetics and polymorphic crystalline structure in stereocomplexable polymers

which influences the physical properties of obtained materials. Herein

we select the medium-molecular-weight (MMW) poly(

-lactic acid)/poly(

-lactic acid) (PLLA/PDLA) asymmetric blends with different PDLA fractions (

=0.01−0.5) as the model system and investigate the effects of

and crystallization temperature (

) on the crystallization kinetics and polymorphic crystalline structure. We observe the fractionated (

i.e.

multistep) crystallization kinetics and the formation of peculiar

-form homocrystals (HCs) in the asymmetric blends under quiescent conditions

which are strongly influenced by both

and

. Precisely

crystallization of

-form HCs is favorable in the MMW PLLA/PDLA blends with high

(≥0.2) at a low

(80−100 °C). It is proposed that the formation of metastable

-form HCs is attributed to the conformational matching between

-form HCs and SCs

and the stronger constrain effects of precedingly-formed SCs in the early stage of crystallization. Such effects can also cause the multistep crystallization kinetics of MMW PLLA/PDLA asymmetric blends in the heating process.

关键词

Keywords

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DOI：10.1007/s10118-022-2658-8

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Abstract

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references

Fractionated Crystallization Kinetics and Polymorphic Homocrystalline Structure of Poly(_L-lactic acid)/Poly(_D-lactic acid) Blends: Effect of Blend Ratio

Fractionated Crystallization Kinetics and Polymorphic Homocrystalline Structure of Poly(_L-lactic acid)/Poly(_D-lactic acid) Blends: Effect of Blend Ratio