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首页> 外文期刊>Journal of Applied Polymer Science >The glass transition, crystallization, and melting characteristics of a class of polyester ionomers
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The glass transition, crystallization, and melting characteristics of a class of polyester ionomers

机译：一类聚酯离聚物的玻璃化转变，结晶和熔融特性

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摘要

The glass transition temperature (T-g), crystallization, and melting character of a class of random polyester ionomers (polymer containing < 10 mol % ionic groups) were investigated. The nonlinear change of the T-g and crystallization and melting behavior were characterized using differential scanning colorimetry (DSC). The ionomers are derived from polyethylene terephathalate (PET) modified through copolycondensation with a fully neutralized sulfonate moiety (sodiosulfo) isophthalate (Na-SIP). Significant and systematic changes in the glass transition temperature and thermal characteristics upon addition of Na-SIP on the PET backbone were observed, indicating strong association and interaction on the ionic species. At Na-SIP levels greater than or equal to 4 mol %, the turn of the the glass transition temperature was found, and the same results were obtained for the samples treated either by quenching or dissolution, suggesting the presence of reversible crosslink and aggregation of the ionic species within the organic matrix. When crystallized from the healing or cooling the samples during the DSC nonisothermal crystallization run at a 10degreesC/min, the enthalpy of the cold crystallization and melting showed an obvious decrease with the increase of Na-SIP content, and changes of the crystal temperature had an analogy to those of the T-g. A tune of the crystal temperature was found at Na-SIP levels greater than or equal to 3 mol % (see Figs. 4, 5, and 7). The experimental data were discussed in the context of the restricted mobility model of the aggregation in the ionomers. (C) 2002 Wiley Periodicals, Inc. [References: 7]
机译：研究了一类无规聚酯离聚物（含离子量小于10 mol％的聚合物）的玻璃化转变温度（T-g），结晶度和熔融特性。用差示扫描比色法（DSC）表征了T-g的非线性变化以及结晶和熔融行为。该离聚物源自通过与完全中和的磺酸盐部分（磺基磺基）间苯二甲酸酯（Na-SIP）共缩聚改性的聚对苯二甲酸乙二酯（PET）。观察到在PET骨架上添加Na-SIP后，玻璃化转变温度和热特性发生了显着而系统的变化，表明在离子种类上具有很强的缔合和相互作用。在Na-SIP含量大于或等于4 mol％时，发现玻璃化转变温度发生了变化，并且通过淬灭或溶解处理的样品获得了相同的结果，表明存在可逆的交联和聚集。有机基质中的离子种类。当以10℃/ min的速度进行DSC非等温结晶过程中样品的愈合或冷却时结晶时，随着Na-SIP含量的增加，冷结晶和熔化的焓显着降低，并且结晶温度的变化具有一定的规律性。与Tg类似。在Na-SIP含量大于或等于3mol％时发现晶体温度的变化（见图4、5和7）。在离聚物的聚集的受限迁移率模型的背景下讨论了实验数据。 （C）2002 Wiley Periodicals，Inc. [参考：7]

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