Strain-induced crystallization of poly(ethylene 2,5-furandicarboxylate). Mechanical and crystallographic analysis
Strain-induced crystallization of poly(ethylene 2,5-furandicarboxylate). Mechanical and crystallographic analysis
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DOI：
10.1016/j.polymer.2019.122126
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发表时间：
2020-01-01
期刊：
影响因子：
4.6
通讯作者：
Billon, Noelle
中科院分区：
文献类型：
--
作者：
Forestier, Emilie;Combeaud, Christelle;Billon, Noelle
聚(2，5-呋喃甲酸乙二醇酯)，简称PEF，在玻璃化转变温度以上进行单轴拉伸。这种基于生物的聚合物被认为是石油类似物聚对苯二甲酸乙二酯(PET)的有力竞争对手。为了在瓶子成型中取代PET，PEF必须变形成大应变，只有当它处于橡胶状态时才能达到。在本工作中，通过精确确定PEF呈现类橡胶状态的温度和应变速率范围来选择拉伸条件。通过在参考温度下建立主曲线，这是可行的。局部应变场测量可以描述PEF的本征力学行为。在拉伸比约为6：8的情况下，机械响应呈现出令人印象深刻的应变硬化，同时形成了具有高取向的定义良好的晶相。对衍射峰进行了指标化，并与以前的文献进行了比较。在机械加载或静态结晶过程中，只观察到一个晶相。机械加载显著加快了结晶速度。
Poly(ethylene 2,5-furandicarboxylate), referred to as PEF, was uni-axially stretched for temperatures above glass transition temperature. This bio-based polymer is considered as a serious competitor for the petroleum analogous poly(ethylene terephthalate), named PET. To replace PET in bottle forming, PEF has to be deformed to large strains which are only reachable when it is in its rubbery state. In the present work, the stretching conditions have been chosen by determining precisely the range of temperature and strain rate where PEF exhibits a rubbery-like state. This was feasible through the building of a master curve at a reference temperature. Local strain field measurements allow the description of PEF intrinsic mechanical behaviour. Above a draw ratio of around 6 to 8, the mechanical response presents an impressive strain hardening whereas a well-defined crystalline phase with a high orientation is formed. Diffraction peaks were indexed and compared to previous papers. Only one crystalline phase was observed either under mechanical loading or during static crystallization. Mechanical loading significantly speeds up crystallization.