Citation: 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, ;2018, 0(5): 598-606. doi: 10.11777/j.issn1000-3304.2017.17197 shu

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

1.
Beijing Key Laboratory of Clothing Materials R & D and Assessment, Beijing Engineering Research Center of Textile Nanofiber, Beijing Institute of Fashion Technology, Beijing 100029
2.
Beijing National Laboratory for Molecular Sciences, Key Laboratory of Engineering Plastic, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190
3.
Madrid Institute for Advances Studies of Materials, Madrid 28906, Spain

Corresponding author: Xiu-qin Zhang, clyzxq@bift.edu.cn
Received Date: 24 July 2017
Revised Date: 30 August 2017
Available Online: 1 March 2018

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-b-PEG-b-PDLA) were used to modify the structure and property of PLLA. PLLA/PDLA-b-PEG-b-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-b-PEG-b-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 α 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-b-PEG-b-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 α crystals in the PLLA/ PDLA-b-PEG-b-PDLA blends was significantly enhanced during the stretching process. The critical strain, where α 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.
- Poly(L-lactic acid),
- PDLA-b-PEG-b-PDLA,
- Stretching behavior,
- Crystallization
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沈阳化工大学材料科学与工程学院沈阳 110142