• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Applied Polymer Science >Melting, crystallization behaviors, and nonisothermal crystallization kinetics of PET/PTT/PBT ternary blends
【24h】

Melting, crystallization behaviors, and nonisothermal crystallization kinetics of PET/PTT/PBT ternary blends

机译：PET / PTT / PBT三元共混物的熔融，结晶行为和非等温结晶动力学

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The melting, crystallization behaviors, and nonisothermal crystallization kinetics of the ternary blends composed of poly(ethylene terephthalate), poly(trimethylene terephthalate) (PTT) and poly(buthylene terephthalate) (PBT) were studied with differential scanning calorimeter (DSC). PBT content in all ternary blends was settled invariably to be one-third, which improved the melt-crystallization temperature of the ternary blends. All of the blend compositions in amorphous state were miscible as evidenced by a single, composition-dependent glass transition temperature (T-g) observed in DSC curves. DSC melting thermograms of different blends showed different multiple melting and crystallization peaks because of their various polymer contents. During melt-crystallization process, three components in blends crystallized simultaneously to form mixed crystals or separated crystals depending upon their content ratio. The Avrami equation modified by Jeziorny and the Ozawa theory were employed to describe the nonisothermal crystallization process of two selected ternary blends. The results spoke that the Avrami equation was successful in describing the nonisothermal crystallization process of the ternary blends. The values of the t(1/2) and the parameters Z(c) showed that the crystallization rate of the ternary blends with more poly(ethylene terephthalate) content was faster than that with the lesser one at a given cooling rate. The crystal morphology of the five ternary blends investigated by polarized optical microscopy (POM) showed different size and distortional Maltese crosses or light spots when the PTT or poly(ethylene terephthalate) component varied, suggesting that the more the PTT content, the larger crystallites formed in ternary blends. (c) 2007 Wiley Periodicals, Inc. J Appl Polym Sci 104: 3459-3468, 2007.
机译：用差示扫描量热仪（DSC）研究了由聚对苯二甲酸乙二醇酯，聚对苯二甲酸丙二醇酯（PTT）和聚对苯二甲酸丁二醇酯（PBT）组成的三元共混物的熔融，结晶行为和非等温结晶动力学。所有三元共混物中的PBT含量始终固定为三分之一，从而提高了三元共混物的熔融结晶温度。 DSC曲线中观察到的单一的，取决于组成的玻璃化转变温度（T-g）证明了，所有处于非晶态的共混物组成都是可混溶的。不同共混物的DSC熔解热谱图显示出不同的多重熔融和结晶峰，因为它们的聚合物含量不同。在熔融结晶过程中，共混物中的三种成分同时结晶，形成混合晶体或分离的晶体，具体取决于它们的含量比。用Jeziorny和Ozawa理论修正的Avrami方程描述了两种选择的三元共混物的非等温结晶过程。结果表明，Avrami方程成功地描述了三元共混物的非等温结晶过程。 t（1/2）和参数Z（c）的值表明，在给定的冷却速率下，聚对苯二甲酸乙二酯含量较高的三元共混物的结晶速率要快于较小的三元混合物。偏振光学显微镜（POM）研究的五种三元共混物的晶体形态显示出不同的尺寸，当PTT或聚对苯二甲酸乙二酯成分变化时，马耳他十字形或光斑畸变，这表明PTT含量越多，形成的微晶越大。三元混合。 （c）2007 Wiley Periodicals，Inc. J Appl Polym Sci 104：3459-3468，2007。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号