Study on microstructure and properties of ST-NAB3 nucleating agent-modified chain-extended poly lactic acid
PLA was melt-blended with a chain extender(CEAX8840)and a nucleating agent(ST-NAB3)by using a torque rheometer,and the microstructure,crystallization behavior,mechanical properties,and heat resistance of the modified PLA were characterized by suing scanning electron microscope,hot-plate polarizing microscope,differential scanning calorimeter,thermal deformation meter,universal testing machine,and impact tester.The results indicated that the modified PLA obtained the smallest crystal size at CEAX8840 and ST-NAB3 contents of 6 and 1 wt％,respec-tively;however,its crystal density was the highest.Moreover,the crystallization temperature and crystallinity degree of the modified PLA were increased to 123.9 ℃ and 44.9％,respectively.In addition,its impact strength and thermal de-formation temperature were increased to 64.7 kJ/m2 and 84.9 ℃,respectively.
poly(lactic acid)chain extendernucleating agentimpact strengththermal deformation temperature
万方数据
维普
