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采用冷冻萃取聚对苯二甲酸乙二酯(PET)溶液(0.1～10g/dL7种不同浓度,3种不同性能溶剂)的方法制备了解缠结PET试样.与链相互穿透且缠结的熔体骤冷试样相比,解缠结PET试样的结晶能力明显增强,且随着制样溶液浓度的降低,链间解缠结程度增加,PET的结晶能力逐渐增强,有序结构含量明显增加,但是如果制样溶液浓度太低,溶液中链间距离太大,则又不利于萃取过程中链间的有序堆砌而结晶.采用接触浓度c*附近的溶液,既可确保链间的有效解缠结又有利于链间的有序堆砌而结晶.PET的结晶能力甚至还受制样所用溶剂性能的影响,这是因为溶剂性能影响了溶液中链间的相互作用以及链的解缠结程度.
Uncooled PET samples were prepared by freeze-extraction of polyethylene terephthalate (PET) solutions (0.1-10 g / dL of 7 different concentrations and 3 different performance solvents) Compared with the melt-quenched samples, the crystallization ability of the untwisted PET samples is obviously enhanced. With the decrease of the concentration of the sample solution, the degree of inter-chain disentanglement increases, the crystallization ability of PET gradually increases, and the ordered structure content Obviously increase, but if the sample solution concentration is too low, the distance between the chains in the solution is too large, it is not conducive to the extraction process of the orderly stacking between chains and crystallization.Using contact concentration c * near the solution, Of the effective solution entanglement is also conducive to the orderly stacking between the chain crystallization.PET crystallization ability even by the solvent properties of the sample preparation, this is because the solvent properties affect the interaction between the solution chain and the chain unwrapping Degree of knot.