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qvblybf木虫 (正式写手)
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[求助]
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采用熔融共混法制备了一系列PET/矿物填料复合材料，采用示差扫描量热法(DSC)研究了含有碳酸钙（CaCO3）、蒙脱土（MMT）或凹凸棒土（AT）的PET复合材料在不同热历程中的结晶和熔融行为，并初步研究多种碳酸钙对PET拉伸强度的影响。研究发现MMT和AT对PET的慢速降温结晶无明显影响，而碳酸钙在慢速降温过程中能够有效促进PET结晶，在-2.5℃/min的降温速率下随碳酸钙含量增加结晶热焓（△Hc）分别达到-11.67J/g、-19.40J/g和-23.22J/g。填料种类和含量会对复合材料升温过程的冷结晶和熔融产生较大影响，低含量矿物填料主要对PET的冷结晶起成核作用，其中MMT成核效果最好。较高含量下不同填料会对PET结晶结构产生影响，从而得到多样的DSC曲线变化。碳酸钙对PET冷结晶和熔融参数的影响介于MMT和AT之间，采用通用聚合物加工方法制备的PET/碳酸钙复合材料保持了较高的拉伸强度。 A series of PET/Mineral filler composites were prepared by melt blending. Crystallization and melting behavior of PET composites respectively containing Calcium Carbonate(CaCO3), Montmorillonite(MMT) and Attapulgite(AT) of various thermal histories were studied by Differential Scanning Calorimeter(DSC). The effect of veriety CaCO3 in tensile strength of PET composites was studied. It was found that there was no significant effect of MMT and AT in slow cooling crystallization of PET. At the same time CaCO3 effectively promoted crystallization of PET in -2.5℃/min cooling process, the crystallization enthalpy increased to -11.67J/g, -19.40J/g and -23.22J/g respectively with the growth of CaCO3 contents. Filler types and contents played important roles in cold crystallization and melting during the heating process, when contents was low, the mineral filler assisted crystallization as the crystalline core which MMT was the best of all three. As the contents came higher, mineral fillers affected the crystal structures, leaded to variety DSC curve. Acticity of CaCO3 in PET cold crystallization and melting ranged between MMT and AT, with the common polymer processing methods, PET/CaCO3 composites maintained a sufficiently high tensile strength. |
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xiaohanhan2007 
捐助贵宾 (小有名气)
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【答案】应助回帖
qvblybf(金币+200, 翻译EPI+1): 谢谢! 总体还算可以，毕竟有点隔行了，我们是学高分子的，谢谢了啊！ 2011-11-26 22:23:00
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A series of PET/Mineral filler composites have been prepared by the method of melt blending, and the crystallization and melting behaviors of PET composites containing calcium carbonate(CaCO3), montmorillonite(MMT) or attapulgite(AT) during different stages of the thermo process utilizing the differential scanning calorimeter(DSC). Besides, the effects of various types of CaCO3 on the tensile strength have been preliminarily investigated. The results exhibited that MMT and AT did not influence the slow cooling crystallization of PET significantly, whereas CaCO3 has been shown to facilitate the crystallization of PET in this process. The crystallization enthalpy (△Hc) increased with increasing content of CaCO3 at the cooling rate of -2.5℃/min, reaching -11.67J/g、-19.40J/g and -23.22J/g, respectively. Moreover, the types and contents of the fillers have also been demonstrated to affect the cold crystallization and melting of the heating process remarkably. Mineral fillers of low contents would promote the nucleation in the cold crystallization of PET, among which MMT has been justified to be the most effective. Mwanwhile, different mineral fillers of relatively high contents would affect the crystal structures of PET, yielding various types of DSC curves. Furthermore, the effect of CaCO3 on the cold crystallization and melting parameters has been proven to range between MMT and AT, and thus, a relatively high tensile strength could be maintained employing the PET/CaCO3 composites prepared by the general polymer processing methods. |
3楼2011-11-26 15:43:02
qvblybf
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2楼2011-11-26 13:36:31
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