The Crystallization and Melting Behaviors of PDLA-<italic style="font-style: italic">b</italic>-PBS-<italic style="font-style: italic">b</italic>-PDLA Tri-block Copolymers

Cong-Shu Feng; Yun Chen; Jun Shao; Gao Li; Hao-Qing Hou

doi:10.1007/s10118-020-2361-6

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The Crystallization and Melting Behaviors of PDLA-b-PBS-b-PDLA Tri-block Copolymers

ARTICLE | Updated：2019-11-27

- The Crystallization and Melting Behaviors of PDLA-b-PBS-b-PDLA Tri-block Copolymers
- Chinese Journal of Polymer Science Vol. 38, Issue 3, Pages: 298-310(2020)
- Affiliations：
  
  a.College of chemistry and chemical engineering, Jiangxi Normal University, Nanchang 330022, China
  b.Jiangxi Key Laboratory of Organic Chemistry, Jiangxi Science and Technology Normal University, Nanchang 330013, China
  c.Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
- Author bio：
  
  jun.shao@jxnu.edu.cn (J.S.)
  hhq2001911@126.com (H.Q.H.)
- Funds：
- DOI：10.1007/s10118-020-2361-6
  CLC：
- Received：11 June 2019，
  
  Revised：2019-9-24，
  
  Accepted：08 October 2019，
  
  Online First：27 November 2019，
  
  Published：2020-03
- Accepted：
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Feng, C. S.; Chen, Y.; Shao, J.; Li, G.; Hou, H. Q. The crystallization and melting behaviors of PDLA-, b,-PBS-, b,-PDLA tri-block copolymers. Chinese J. Polym. Sci. 2020, 38, 298–310.

Cong-Shu Feng, Yun Chen, Jun Shao, et al. The Crystallization and Melting Behaviors of PDLA-b-PBS-b-PDLA Tri-block Copolymers[J]. Chinese Journal of Polymer Science, 2020, 38(3): 298-310. DOI: 10.1007/s10118-020-2361-6.
Feng, C. S.; Chen, Y.; Shao, J.; Li, G.; Hou, H. Q. The crystallization and melting behaviors of PDLA-, b,-PBS-, b,-PDLA tri-block copolymers. Chinese J. Polym. Sci. 2020, 38, 298–310. DOI： 10.1007/s10118-020-2361-6.

Cong-Shu Feng, Yun Chen, Jun Shao, et al. The Crystallization and Melting Behaviors of PDLA-b-PBS-b-PDLA Tri-block Copolymers[J]. Chinese Journal of Polymer Science, 2020, 38(3): 298-310. DOI: 10.1007/s10118-020-2361-6. DOI：

摘要

Abstract

In this study

the poly(D-lactide)-block-poly(butylene succinate)-block-poly(D-lactide) (PDLA-

-PBS-

-PDLA) triblock copolymers with a fixed length of PBS and various lengths of PDLA are synthesized

and the crystallization behaviors of the PDLA and PBS blocks are investigated. Although both the crystallization behaviors of PBS and PDLA blocks depend on composition

they exhibit different variations. For the PDLA block

its crystallization behaviors are mainly influenced by temperature and block length. The crystallization signals of PDLA block appear in the B-D 2-2 specimen

and these signals get enhanced with PDLA block length. The crystallization rates tend to decrease with increasing PDLA block lendth during crystallizing at 90 and 100 °C. Crystallizing at higher temperature

the crystallization rates increase at first and then decrease with block length. The crystallization rates decrease as elevating the crystallization temperature. The melting temperatures of PDLA blocks increase with block lengths and crystallization temperatures. For the PBS block

its crystallization behaviors are mainly controlled by the nucleation and confinement from PDLA block. The crystallization and melting enthalpies as well as the crystallization and melting temperatures of PBS block reduce as a longer PDLA block has been copolymerized

while the crystallization rates of the PBS block exhibit unique component dependence

and the highest rate is observed in the B-D 2-2 specimen. The Avrami exponent of PBS crystallites is reduced as a longer PDLA block is incorporated or the sample is crystallized at higher temperature. This investigation provides a convenient route to tune the crystallization behavior of PBS and PLA.

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Keywords

references

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⁰

The Crystallization and Melting Behaviors of PDLA-b-PBS-b-PDLA Tri-block Copolymers

DOI：10.1007/s10118-020-2361-6

摘要

Abstract

关键词

Keywords

references