Effect of Poly(D-lactic acid) Block Copolymers with Soft Chains on the Tensile Behavior of Poly(L-lactic acid)

Xiao-lu Li; Rui Wang; Chun-fang Yang; Zhen-feng Dong; Xiu-qin Zhang; Du-jin Wang; De-yi Wang

doi:10.11777/j.issn1000-3304.2017.17197

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Effect of Poly(D-lactic acid) Block Copolymers with Soft Chains on the Tensile Behavior of Poly(L-lactic acid)

Research Article | 更新时间：2021-01-26

- Effect of Poly(D-lactic acid) Block Copolymers with Soft Chains on the Tensile Behavior of Poly(L-lactic acid)
- Acta Polymerica Sinica Vol. 0, Issue 5, Pages: 598-606(2018)
- 作者机构：
  
  1.北京服装学院服装材料研究开发与评价北京市重点实验室北京市纺织纳米纤维工程技术研究中心　北京 100029
  2.中国科学院化学研究所北京分子科学国家实验室中国科学院工程塑料重点实验室　北京 100190
  3.马德里高等材料研究院马德里 28906
- 作者简介：
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2017.17197
  CLC：
- Published：2018-5，
  
  Received：24 July 2017，
  
  Revised：30 August 2017，
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Xiao-lu Li, Rui Wang, Chun-fang Yang, Zhen-feng Dong, Xiu-qin Zhang, Du-jin Wang, De-yi Wang. Effect of Poly(D-lactic acid) Block Copolymers with Soft Chains on the Tensile Behavior of Poly(L-lactic acid). [J]. Acta Polymerica Sinica 0(5):598-606(2018)
DOI：

Xiao-lu Li, Rui Wang, Chun-fang Yang, Zhen-feng Dong, Xiu-qin Zhang, Du-jin Wang, De-yi Wang. Effect of Poly(D-lactic acid) Block Copolymers with Soft Chains on the Tensile Behavior of Poly(L-lactic acid). [J]. Acta Polymerica Sinica 0(5):598-606(2018) DOI： 10.11777/j.issn1000-3304.2017.17197.

摘要

采用聚右旋乳酸(PDLA)与聚乙二醇(PEG)的三嵌段共聚物(PDLA-

-PEG-

-PDLA)对聚左旋乳酸(PLLA)进行改性，系统研究熔融共混法制备的PLLA/PDLA-

-PEG-

-PDLA共混物的热性能和不同温度下的拉伸行为，并通过原位X射线散射(WAXS)技术探索不同含量的PDLA-

-PEG-

-PDLA对PLLA在拉伸过程中结晶行为的影响. 结果表明，加入PDLA-

-PEG-

-PDLA对PLLA的热稳定性影响较小；PLLA/PDLA-

-PEG-

-PDLA共混物中由于立构晶的存在，能有效提高PLLA的

晶的结晶速率；室温(30 °C)拉伸时，样品均呈现脆性断裂；拉伸温度提高至50 °C，纯PLLA和PLLA/PDLA-

-PEG-

-PDLA (95/5)的共混物仍然呈现脆性断裂，但是随着PDLA-

-PEG-

-PDLA含量的增加，PLLA发生屈服，断裂伸长率由纯PLLA的10%左右提高至200%以上；80 °C拉伸时，PDLA-

-PEG-

-PDLA的加入显著提高了PLLA在拉伸过程中的结晶速率，出现

晶的应变从纯PLLA的400%降低至50%以下，立构晶含量在拉伸过程中基本保持不变. 上述结果显示含柔性链段的PDLA的嵌段共聚物可有效提高PLLA的结晶速率和延展性，拓宽PLLA的应用范围.

Abstract

Poly(L-lactic acid) (PLLA) is a biodegradable and biocompatible material used in many fields

such as packaging

textile and drug delivery. The low crystallization rate and poor toughness are two major drawbacks for its processing and high-performance applications. In this study

poly(D-lactic acid)-polyethylene glycol (PEG)-poly(D-lactic acid) triblock copolymers (PDLA-

-PEG-

-PDLA) were used to modify the structure and property of PLLA. PLLA/PDLA-

-PEG-

-PDLA blends were prepared by melt blending

and their thermal and mechanical properties were systematically studied by thermal gravimetric analysis (TGA)

differential scanning calorimetry (DSC) and temperature-variable tensile tests. To understand the structure evolution

the crystallization behavior of the blends during stretching was investigated by

in situ

wide angle X-ray scattering (WAXS). The results showed that the addition of PDLA-

-PEG-

-PDLA had no detrimental effect on the thermal stability of PLLA. By virtue of the nucleation capacity of the stereo-complex crystals formed between PLLA and PDLA chains

the crystallization rate of the

crystals of the PLLA matrix was improved remarkably compared with that of pure PLLA. When stretched at room temperature (30 °C)

the modified PLLA samples displayed brittle fracture. With the stretching temperature increased to 50 °C

both PLLA and PLLA/PDLA-

-PEG-

-PDLA (95/5) exhibited brittle fracture. However

the blends showed clear yielding and ductile deformation with an elongation at break as high as 200% when the content of the triblock copolymer was above 5%. With the stretching temperature further increased to 80 °C

the crystallization of

crystals in the PLLA/ PDLA-

-PEG-

-PDLA blends was significantly enhanced during the stretching process. The critical strain

where

crystals appeared in the blend

decreased from 400% in pure PLLA to less than 50%. The stereo-complex crystallites had no change during the stretching process. The above results indicated that the triblock copolymer consisting of PDLA and PEG chains was an excellent candidate as PLLA modifier with dual effects of promoting crystallization and improving toughness.

关键词

聚左旋乳酸嵌段共聚物拉伸行为结晶

Keywords

Poly(L-lactic acid)PDLA-b-PEG-b-PDLAStretching behaviorCrystallization

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SINOPEC Beijing Research Institute of Chemical Industry

College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University

State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology

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Bohai Rim Collaborative Innovation Center on Green Chemical Application Technology, Department of Chemical Engineering, Weifang Vocational College

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