Rapid compression induced solidification of two amorphous phases of poly(ethylene terephthalate)
Rapid compression induced solidification of two amorphous phases of poly(ethylene terephthalate)
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DOI：
10.1088/0022-3727/39/16/024
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发表时间：
2006-08-21
影响因子：
3.4
通讯作者：
Li, L. B.
中科院分区：
文献类型：
--
作者：
Hong, S. M.;Liu, X. R.;Li, L. B.
聚对苯二甲酸乙二酯（PET）熔体分别通过20 ms内快速压缩至2 GPa和一系列比较工艺（包括自然冷却、缓慢压缩和快速冷却）固化。结合回收样品的XRD和差示扫描量热数据，明确了快速压缩诱导了两种非晶相。一种是相对稳定的，也可以在缓慢压缩和冷却过程中形成。另一种是亚稳的，在371K转变为晶相.这种亚稳非晶相不能通过缓慢压缩或自然冷却获得，并且其晶化温度与快速冷却样品中形成的亚稳非晶相的晶化温度显著不同。
Melts of poly(ethylene terephthalate) were solidified by rapid compression to 2 GPa within 20 ms and by a series of comparative processes including natural cooling, slow compressing and rapid cooling, respectively. By combining XRD and differential scanning calorimetry data of the recovered samples, it is made clear that rapid compression induces two kinds of amorphous phases. One is relatively stable and can also be formed in the slow compression and the cooling processes. Another is metastable and transforms to crystalline phase at 371 K. This metastable amorphous phase cannot be obtained by slow compression or natural cooling, and its crystallization temperature is remarkably different from that of the metastable amorphous phase formed in the rapid cooling sample.