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首页> 外文期刊>Journal of Applied Polymer Science >CARRIER EFFECT ON STRUCTURE AND PROPERTIES OF HEAT-TREATED POLY(ETHYLENE TEREPHTHALATE) FIBERS .1. THERMAL ANALYSIS AND DYNAMIC MECHANICAL PROPERTIES
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CARRIER EFFECT ON STRUCTURE AND PROPERTIES OF HEAT-TREATED POLY(ETHYLENE TEREPHTHALATE) FIBERS .1. THERMAL ANALYSIS AND DYNAMIC MECHANICAL PROPERTIES

机译：载体对热处理的聚对苯二甲酸乙二酯纤维的结构和性能的影响1。热分析和动态力学性能

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Poly(ethylene terephthalate) (PET) fibers of different draw ratios (as spun and drawn 2.8X) were submitted to different heat settings. Subsequently, they were treated in benzoic acid solutions at different concentrations and for different times of exposition. The plasticizing effect on the morphology of these heat-setted fibers due to the different treatments in benzoic acid solutions was studied by differential scanning calorimetry (DSC) and dynamic and mechanical thermal analysis (DMTA). The DSC experiments revealed the appearance of a premelting peak (pml) around 130 degrees C, when the applied heat settings were carried out for 8 h in the presence of boiling water, and around 150-160 degrees C for the dry heat setting for 7 h at 130 degrees C followed by 1 h in the presence of boiling water. These premelting peaks have been associated with the melting of smaller and imperfect crystals present in the amorphous region. Also, the analysis of the main melting peaks revealed that the undrawn fiber presented a wider distribution of smaller crystals than the drawn one. Their subsequent treatments in the benzoic acid solutions revealed through the DSC thermograms that this first premelting peak tends to disappear as the concentration and time of benzoic acid treatment increase. Also, a new premelting peak (pm2) appears in the DSC thermograms at temperature around 180 degrees C. It seems that a dislocation of the pml peak is occurring toward higher temperatures and is being transformed in this new premelting peak. The DMTA revealed the appearance of an alpha(c) transition in the temperature range from 140 to 160 degrees C and this alpha(c) transition seems to be related to the relaxations of the new crystallites formed due to the plasticization effect of the benzoic acid. Also, the second premelting peak seems to be related to the fusion of such crystals. Therefore, a complex change in the morphology of the studied PET fibers due to the benzoic acid action has been revealed. (C) 1996 John Wiley & Sons, Inc. [References: 22]
机译：将不同拉伸比（纺丝和拉伸2.8倍）的聚对苯二甲酸乙二醇酯（PET）纤维置于不同的热定型下。随后，将它们在苯甲酸溶液中以不同浓度和暴露时间进行处理。通过差示扫描量热法（DSC）和动态和机械热分析（DMTA）研究了由于在苯甲酸溶液中的不同处理而对这些热固性纤维的形态造成的塑化作用。 DSC实验表明，当在沸水存在下进行8 h施加的热定型时，在130摄氏度左右出现预熔融峰（pml）;对于7℃的干热定型，大约150-160摄氏度时出现预熔融峰（pml）。在130摄氏度下保持1小时，然后在沸水存在下1小时。这些预熔融峰与非晶区中存在的较小且不完美的晶体的熔融有关。同样，对主要熔融峰的分析表明，未拉伸纤维比拉伸纤维呈现出更广泛的分布，其中较小的晶体。通过DSC热分析图，他们随后在苯甲酸溶液中的处理表明，随着苯甲酸处理的浓度和时间的增加，第一个预熔峰趋于消失。另外，在约180摄氏度的温度下，DSC热分析图中出现一个新的预熔峰（pm2）。似乎pml峰的位错朝着更高的温度发生，并且正在此新的预熔峰中转变。 DMTA揭示了在140至160摄氏度的温度范围内出现α（c）转变的现象，并且该alpha（c）转变似乎与由于苯甲酸的增塑作用而形成的新微晶的弛豫有关。 。同样，第二个预熔融峰似乎与这种晶体的融合有关。因此，已经发现由于苯甲酸作用，所研究的PET纤维的形态发生了复杂的变化。 （C）1996 John Wiley＆Sons，Inc. [参考：22]

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