Inducing nano-confined crystallization in PLLA and PET by elastic melt stretching.
Inducing nano-confined crystallization in PLLA and PET by elastic melt stretching.
复制标题
通过弹性熔融拉伸在 PLLA 和 PET 中诱导纳米限制结晶。
DOI：
10.1039/d0sm02181d
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发表时间：
2021
期刊：
影响因子：
3.4
通讯作者：
Gengxin Liu
中科院分区：
文献类型：
--
作者：
M. Razavi;Wenwen Zhang;H. Khonakdar;A. Janke;Liangbin Li;Gengxin Liu
基于广泛研究的聚（l-乳酸）（PLLA）和聚对苯二甲酸乙二醇酯（PET），它们在完全结晶形式下是脆性的，这封信表明，它们可以通过创建纳米尺寸的晶体同时保留缠结网络来制成超延展性，耐热性和光学透明。原子力显微镜图像证实了所感知的纳米限制结晶。时间分辨的X-射线散射/衍射测量揭示了冷结晶的出现，无论是应力松弛从大的逐步熔融拉伸或退火的预熔融拉伸PLLA和PET以上的Tg。机械测试表明，处于这种新状态的这些聚合物甚至远高于Tg也是刚性的，例如，在100 °C。
Based on the widely studied poly(l-lactic acid) (PLLA) and polyethylene terephthalate (PET) that are brittle in their fully crystalline form, this Letter shows that they can be made to be super ductile, heat resistant and optically clear by creating nano-sized crystals while preserving the entanglement network. Atomic force microscopic images confirm the perceived nano-confined crystallization. Time-resolved X-ray scattering/diffraction measurements reveal the emergence of cold crystallization during either stress relaxation from large stepwise melt-stretching or annealing of pre-melt-stretched PLLA and PET above Tg. Mechanical tests show that these polymers in such a new state are rigid even well above Tg, e.g., at 100 °C.