Citation: Gang Wang, Ke Wang. Studies on the Induction of Poly(lactic acid) Stereocomplex by Thermal and Tensile Treating[J]. Acta Polymerica Sinica, ;2018, 0(9): 1221-1227. doi: 10.11777/j.issn1000-3304.2018.18011 shu

Studies on the Induction of Poly(lactic acid) Stereocomplex by Thermal and Tensile Treating

Gang Wang ,
Ke Wang ^,

College of polymer science and engineering, Sichuan University, Chengdu 610065

Corresponding author: Ke Wang, wkestar@scu.edu.cn
Received Date: 11 January 2018
Revised Date: 15 March 2018
Available Online: 6 September 2018

Adding stereocomplex (SC) crystals into matrix can effectively improve the hydrolysis resistance and heat-resistance of polylactic acid (PLA). However, the existence of pre-formed SC crystals will increase the processing difficulty because a higher processing temperature is needed. Thus the exploration of inducing SC crystals via external force fields is important. In this paper, ‘quenched’ and ‘annealed’ PLA enantiomer mixtures were studied. The enantiomer mixtures were prepared by solution coprecipitation. Preparation of the ‘quenched’ specimen is done in two steps: hot pressed at 250 °C for 5 min and then quenched in air (15 °C). The method of annealing is done as following: hot pressed at 250 °C for 5 min, annealed at 200 °C for 30 min, and finally quenched in air. The X-ray diffraction patterns indicated that a loose structure with low order degree, named as quasi-ordered phase (QOP), was formed in the two types of the samples. Based on this structure, SC crystals was formed during stretching near the glass transition temperature (T_g) of PLA.The results of infrared spectra indicated that adequate amount of poly(D-lactic acid) (PDLA) is the prerequisite for the induction of SC crystals. There was no SC crystal generated in the specimens with 5% of PDLA, regardless of the treatment used. However, SC crystal appearred in the specimens with 20% of PDLA. This is because that adequate amount of QOP regions can merge and rebuild into complete crystals. In the specimens of high PDLA content, the transition could happen either during annealing or stretching above T_g (e.g., 70 °C). Owing to the self-nucleation and heterogeneous nucleation of QOP, α'-form crystal would be formed concomitantly during annealling. Therefore the former approach cannot generate pure SC crystal. As to the latter approach, depending on the tensile temperature and rate, mesophase, SC crystal and α'-form can be selectively generated. When stretched below T_g (e.g., 50 °C), only mesophase can be obtained beacause of low chain activity. As stretched at 70 °C, the tensile model has a great effect on the induced results. Fast stretching will induce highly pure SC crystals. Otherwise, when given sufficent time for chain segmet adjustment, both SC and α'-form crystals would be induced.
- Tensile deformation,
- Stereocomplex,
- Infrared spectroscopy,
- Quasi-ordered phase
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沈阳化工大学材料科学与工程学院沈阳 110142

Studies on the Induction of Poly(lactic acid) Stereocomplex by Thermal and Tensile Treating

南开大学师唯/华北电力大学（保定）刘景维：二维配位聚合物中有序的亲锂冠醚位点用于无枝晶锂沉积

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通讯作者: 陈斌, bchen63@163.com