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

Gang Wang; Ke Wang

doi:10.11777/j.issn1000-3304.2018.18011

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

Research Article | 更新时间：2021-01-26

- Studies on the Induction of Poly(lactic acid) Stereocomplex by Thermal and Tensile Treating
- Acta Polymerica Sinica Vol. 0, Issue 9, Pages: 1221-1227(2018)
- 作者机构：
  
  四川大学高分子科学与工程学院　成都 610065
- 作者简介：
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2018.18011
  CLC：
- Published：2018-9，
  
  Received：11 January 2018，
  
  Revised：15 March 2018，
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Gang Wang, Ke Wang. Studies on the Induction of Poly(lactic acid) Stereocomplex by Thermal and Tensile Treating. [J]. Acta Polymerica Sinica 0(9):1221-1227(2018)
DOI：

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

摘要

通过溶液共沉淀-压板的方法，在聚乳酸混合物中形成了具备一定有序度的“准有序相”，并基于此结构在聚乳酸的玻璃化转变温度附近进行拉伸形成了立构复合晶(SC晶). 红外光谱的结果表明足够高含量的右旋聚乳酸是诱导形成SC晶的前提：5%含量试样在测试中没有获得SC晶，当含量高达20%时则可以通过低温退火或者拉伸处理试样来形成SC晶. 70 °C退火时由于自成核作用以及准有序相的异相成核作用，往往伴随形成

'晶. 在50 °C拉伸时受限于链段活性只能形成中间相；在70 °C时拉伸模式对诱导效果有很大影响. 以较快速率(应变速率

= 0.06 s

−1

)拉伸可以诱导高纯度的SC晶，间歇性的拉伸会同时形成

'晶和SC晶2种晶体.

Abstract

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 (

) 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

(

e.g.

70 °C). Owing to the self-nucleation and heterogeneous nucleation of QOP

'-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

'-form can be selectively generated. When stretched below

(

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

'-form crystals would be induced.

关键词

拉伸立构复合晶红外光谱准有序相

Keywords

Tensile deformationStereocomplexInfrared spectroscopyQuasi-ordered phase

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CAS Key Laboratory of Engineering Plastics, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences

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