The effect of physical aging on the rates of cold crystallization of poly(ethylene terephthalate)
The effect of physical aging on the rates of cold crystallization of poly(ethylene terephthalate)
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DOI：
10.1016/s0032-3861(00)00092-6
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发表时间：
2000-09
期刊：
影响因子：
4.6
通讯作者：
X. Lu;J. N. Hay
中科院分区：
文献类型：
--
作者：
X. Lu;J. N. Hay
采用差示扫描量热法（DSC）研究了物理老化和去老化对聚对苯二甲酸乙二酯（PET）冷结晶速率的影响。在玻璃化转变温度以下储存无定形PET会增加随后在玻璃化转变温度Tg以上加热时的冷结晶速率，并且速率的增加取决于已经发展的物理老化的程度。各种影响，从发展的初级核存储的假想温度的普遍下降，已被认为是。扫描电镜和热台光学显微镜的散装结晶试样表明，物理老化增加了样品中存在的球晶的数量。去老化，通过加热老化试样到更高的温度，但低于Tg，观察到减少物理老化的程度和结晶率的增加紧随着老化的残余程度。
The effect of physical aging and de-aging on cold crystallization rates of polyethylene terephthalate, (PET) has been investigated by differential scanning calorimetry (DSC). Storage of amorphous PET below the glass transition increases the rates of subsequent cold crystallization on heating above the glass transition temperature, Tg, and the increase in rate depends on the extent of physical aging which has developed. Various effects, from the development of primary nuclei on storage to a general decrease of the fictive temperature, have been considered. Both SEM and hot stage light microscopy of the bulk crystallizing specimens show that physical aging increased the number of spherulites present in the sample. De-aging, by heating aged specimens to higher temperatures but below Tg, was observed to reduce the extent of physical aging and the increase in the rates of crystallization closely followed the residual extent of aging.