MORPHOLOGY AND MECHANICAL PROPERTIES OF PA1010/PP BLENDS OBTAINED VIA DYNAMIC PACKING INJECTION MOLDING

YANG Fengxia; ZHOU Chengjuan; DU Rongni; YANG Jinghui; FU Qiang; SU Run; ZHANG Qin

doi:10.3724/SP.J.1105.2010.09259

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MORPHOLOGY AND MECHANICAL PROPERTIES OF PA1010/PP BLENDS OBTAINED VIA DYNAMIC PACKING INJECTION MOLDING

Research Article | 更新时间：2021-03-19

- MORPHOLOGY AND MECHANICAL PROPERTIES OF PA1010/PP BLENDS OBTAINED VIA DYNAMIC PACKING INJECTION MOLDING
- Acta Polymerica Sinica Issue 7, Pages: 849-856(2010)
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- DOI：10.3724/SP.J.1105.2010.09259
  CLC：
- Published：20 July 2010，
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YANG Fengxia, ZHOU Chengjuan, DU Rongni, YANG Jinghui, FU Qiang, SU Run, ZHANG Qin. MORPHOLOGY AND MECHANICAL PROPERTIES OF PA1010/PP BLENDS OBTAINED VIA DYNAMIC PACKING INJECTION MOLDING. [J]. Acta Polymerica Sinica (7):849-856(2010)
DOI：

YANG Fengxia, ZHOU Chengjuan, DU Rongni, YANG Jinghui, FU Qiang, SU Run, ZHANG Qin. MORPHOLOGY AND MECHANICAL PROPERTIES OF PA1010/PP BLENDS OBTAINED VIA DYNAMIC PACKING INJECTION MOLDING. [J]. Acta Polymerica Sinica (7):849-856(2010) DOI： 10.3724/SP.J.1105.2010.09259.

摘要

通过动态保压注射成型方法制备了聚酰胺1010/聚丙烯（PA1010/PP）共混物，并研究了形态与性能的关系.力学性能测试结果表明在熔体冷却过程中施加剪切可以大大提高共混物的拉伸强度、拉伸模量和缺口冲击强度，当PP的质量分数为20%时，共混物的缺口冲击强度达到21.3 kJ/m2，是静态样的3倍多，拉伸强度达到50.9 MPa，是静态样的1.5倍.扫描电镜（SEM）结果表明在动态保压样的横断面可以观察到剪切诱导的形态，中间是芯层，围绕着芯层的是剪切层，最外面是皮层，相区尺寸显著减小、分散相分散更趋均匀，特别是PP的质量分数为20%时，相区尺寸从原来的约3.9 μm降低到约1.4 μm.动态保压样机械性能的提高归因于剪切作用下独特相形态的形成，分子链沿流动方向的取向是拉伸强度提高的主要原因，而剪切使分散相颗粒变小和剪切层中分子链的取向是冲击强度提高的主要原因.

Abstract

The effect of phase morphology on mechanical properties of the immiscible blends of PA1010/PP have been studied via dynamic packing injection molding (DPIM).The tensile strength

tensile modulus and notched impact strength were found largely increased by means of shear.When the content of PP was 20%

the izod impact strength of dynamic samples was 21.3 kJ/m2

which was more than 3 times that for the static samples.The tensile strength of dynamic samples was 50.9 MPa when the content of PP was 20%

which was 1.5 times that for the static samples.SEM results showed that the shear-induced morphology with core in the center and shearing layer surrounding the core was observed in the cross-section areas of the specimens.SEM results also indicated a remakably decrease of domain size and more uniform dispersion of the dynamic molded specimens

especially when the content of PP was 20%

the domain size decreased from about 3.9 μm to about 1.4 μm.The observed higher mechanical properties in dynamic samples could be due to the effect of phase morphology under shear stress.The tensile strength of dynamic samples is higher than that of static samples in the whole composition region due to the molecular orientation induced by shear stress in DPIM

and the toughing mechanism lies in shearing-induced smaller domain size and the molecular orientation induced by shear stress in DPIM.

关键词

PA1010/PP共混物剪切增韧机理相形态

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