Non-isothermal crystallization kinetics of Nylon 10T and Nylon 10T/1010 copolymers:Effect of sebacic acid as a third comonomer

Nylon 10 T and Nylon 10T/1010 samples were synthesized by direct melt polymerization. The non-isothermal crystallization kinetics of Nylon 10 T and Nylon 10T/1010 was investigated by means of differential scanning calorimetry(DSC). Jeziorny equation and Mo equation were applied to describe the non-isothermal crystallization kinetics of the Nylon 10 T and the Nylon 10T/1010. The activation energies for non-isothermal crystallization were obtained by Vyazovkin's method and Friedman's method, respectively. These results showed that Jeziorny equation and Mo equation well described the non-isothermal crystallization kinetics of the Nylon 10 T and the Nylon 10T/1010. It was found that the values of the activation energy for non-isothermal crystallization of the Nylon 10T/1010 were lower than those of the Nylon 10 T at a given temperature or relative crystallinity degree,which revealed that crystallization ability of the Nylon 10T/1010 was higher. The crystal morphology was observed by means of a polarized optical microscope(POM) and X-ray diffraction(XRD). It was found that the addition of sebacic acid comonomer not only did not change the crystal form of the Nylon 10 T, but also significantly increased the number and decreased the size of spherulites. Comparing with the Nylon 10 T, the crystallization rate was increased with the addition of the sebacic acid comonomer.

Isothermal Crystallization Kinetics of Nylon 10T and Nylon 10T/1010 Copolymers:Effect of Sebacic Acid as a Third Comonomer

Nylon 10T and nylon 10T/1010 samples were synthesized by direct melt polymerization.The isothermal crystallization kinetics of nylon 10T and nylon 10T/1010 was investigated by means of differential scanning calorimetry（DSC）.The crystallization kinetics under isothermal condition has been analyzed by the Avrami equation.It was found that the Avrami equation was well-suited to describe the isothermal crystallization kinetics,combined with the results of the Turnbull-Fisher equation.The values of Tm^0 and Kg were obtained by Hoffman-Weeks and Lauritzen-Hoffman equations,respectively.The activation energies for isothermal crystallization of nylon 10T and nylon 10T/1010 were determined using the Arrhenius equation and found to be-123.24 and-81.86 kJ·mol^（-1）,respectively,which reveals that the crystallization ability of nylon 10T/1010was lower than that of nylon 10T during the isothermal crystallization process.The crystal morphology was observed by means of polarized optical microscopy（POM）and X-ray diffraction（XRD）.It was found that the addition of sebacic acid comonomer did not change the crystal form of nylon 10T,but significantly increased the number and decreased the size of spherulites.

高性能玻璃纤维增强PA10T/PA66复合材料研究

以玻璃纤维(GF)增强,马来酸酐接枝氢化苯乙烯-丁二烯嵌段共聚物(SEBS-g-MAH)增容尼龙10T/尼龙66(PA10T/PA66)共混物,考察了两者用量对共混物力学性能、热变形温度、加工性能等的影响。结果表明,随着玻璃纤维添加量从5%增加到40%,复合材料的拉伸强度不断增加,缺口冲击强度先下降后增加,热变形温度大幅度增加,加工性能则变差,SEBS-g-M AH可以明显提高复合材料的缺口冲击强度。PA66与PA10T质量比为35/65,玻璃纤维添加量为40%,SEBS-g-M AH添加量为5%时,所得复合材料的拉伸强度为223. 4 MPa,缺口冲击强度为19. 65 k J/m^2,热变形温度为237. 9℃,熔体质量流动速率为12. 1 g/10min。冲击断面扫描电镜照片表明SEBS-g-MAH可以提高GF、PA10T和PA66之间的相容性。差示扫描量热研究表明PA66和SEBS-g-MAH会破坏PA10T结晶,GF添加量为5%时促进PA10T结晶,40%时稍微阻碍其结晶。

热氧老化对尼龙10T/短玻璃纤维复合材料性能影响

通过熔融共混法制备短玻璃纤维增强尼龙10T (PA10T/SGF)复合材料,采用差示扫描量热、扫描电子显微镜、力学性能测试等表征方法对200℃下PA10T/SGF复合材料的热氧老化性能进行研究。结果表明,SGF和PA10T树脂基体之间的粘结作用是影响试样力学性能的重要因素,在高温下长期老化后玻璃纤维和基体之间脱粘现象严重,当老化时间为50d时,试样的拉伸强度、弯曲强度、缺口冲击强度的保持率为63.5%,59.8%和68.2%。结晶性能测试表明,200℃下经热氧老化处理后PA10T/SGF试样的结晶度随老化时间的延长呈现先下降后上升的趋势。

高玻纤含量尼龙10T材料熔接线性能研究

制备高含量玻纤增强的尼龙10T材料并对材料的熔接线性能进行研究。研究结果表明:尼龙基体树脂的结晶行为对熔接线性能有明显的影响,结晶温度低,结晶慢的材料熔接线强度会相对较高。成核剂、炭黑和尼龙黑色母对材料的结晶行为有影响,从而影响材料的熔接线强度。成型过程中熔体温度和模具温度对熔接线强度影响很大。