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首页> 外文期刊>Journal of Applied Polymer Science >Crystallization of poly(ehtylene terephthalate)modified withcodiols
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Crystallization of poly(ehtylene terephthalate)modified withcodiols

机译：二醇改性的聚对苯二甲酸乙二醇酯的结晶

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The nucleation of poly(ethylene terephthalate) (PET) by codiols and olefinic segments was studied. The codiols 1,5-pentanediol, 1,8-octanediol, 2,5-.hexanediol, and 1,3-dihydroxymethyl benzene were copolymerized into PET in a concentration range of 0—10 mol %. The melting (Tm), crystallization (729, and glass-transition (Tg) tempera-tures were studied. These codiols were found to be able to nucleate PET at low concentrations, probably by lowering the surface free energy of the chain fold. However, the codiols also disturbed the structural order of the polymer, resulting in a decrease in both the Tm and T~ values. The optimum codiol concentration was found to be at around 1 mol %, which is lower than previously reported. A diamide segment N,N’-bis(p-carbo-methoxybenzoyl)ethanediamine (T2T) was found to be a more effective nucleator than the codiols; however, no synergy was observed between the nucleating effect of the diamide segment T2T and that of the codiol. An olefinic diol (C36-diol) with a molecular weight of 540 g/mol was also copolymerized into PET in a concentration range of 0—21 wt %. Only one Tg was observed in the resulting copolymers, suggesting that the amorphous phases of PET and the C36-diol are miscible. The main effect of incorporat-ing the C36-diol into PET was the lowering of the Tg; thus, the C36-diol is an internal plastifier for PET. The C36-diol had little effect on the Tm value; however, the T~ value actually in’creased in the 11.5 wt % copolymer. As the Tg decreased and the T0 increased, the crystallization window also increased and thereby the likelihood of crystallization. Therefore, the thermally stable C36-diol appears to be an interesting compound that may be useful in improving the crystallization of PET.
机译：研究了二醇和烯烃链段对聚对苯二甲酸乙二醇酯（PET）的成核作用。将共二醇1，5-戊二醇，1，8-辛二醇，2，5-。己二醇和1，3-二羟甲基苯以0-10mol％的浓度范围共聚到PET中。研究了熔化温度（Tm），结晶温度（729）和玻璃化转变温度（Tg），发现这些二醇可在低浓度下使PET成核，可能是降低了链折叠的表面自由能。 ，二元醇也干扰了聚合物的结构顺序，导致Tm和T〜值均下降，发现最佳二元醇浓度约为1 mol％，低于先前报道的二酰胺链段N ，发现N'-双（对-碳-甲氧基苯甲酰基）乙二胺（T2T）比椰油二醇更有效;但在二酰胺链段T2T的成核作用与椰油二醇的成核作用之间未观察到协同作用。分子量为540 g / mol的烯烃二醇（C36-二醇）也以0-21 wt％的浓度共聚到PET中，在所得的共聚物中仅观察到一个Tg，表明PET和C的非晶相。 C36-二醇是可混溶的。将C36-二醇公司化为PET是降低Tg。因此，C36-二醇是PET的内部增塑剂。 C36-二醇对Tm值的影响很小。然而，在11.5 wt％的共聚物中，T〜值实际上增加了。随着Tg的降低和T0的增加，结晶窗口也增加，从而结晶的可能性也增加。因此，热稳定的C36-二醇似乎是令人感兴趣的化合物，可用于改善PET的结晶。

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