MPBO对PA6/NMA共混物热性能及力学性能的影响

Effect of MPBO on Thermal and Mechanical Properties of PA6 / NMA Blends

采用熔融共混法制备了尼龙6/N-苯基马来酰亚胺-马来酸酐二元共聚物/2,2'-(1,3-亚苯基)双(2-噁唑啉)(PA6/NMA/MPBO)共混物,利用差示扫描量热法(DSC)、热重分析(TGA)、热变形温度、力学性能、熔体质量流动速率等测试研究了MPBO含量对PA6/NMA/MPBO共混物热性能及力学性能的影响。结果表明,随着MPBO含量的增加,PA6/NMA/MPBO共混物的结晶温度、熔融温度、熔融焓以及结晶度均逐渐降低,热稳定性先增加后减小;当MPBO的含量为2份时,热变形温度、拉伸强度和弯曲强度均达到最大值,分别为72.4℃、80.05MPa、106.44 MPa,较纯PA6分别提高了26.9%、15.2%和17%;当MPBO的含量为3份时,PA6/NMA/MPBO共混物熔体质量流动速率达到最低值,仅为0.8 g/10min。

Nylon 6 （PA6） /N-phenyl maleimide-maleic anhydride copolymer （NMA） /2, 2＇- （1, 3-phenylene） bis-2-oxazolin （MPBO） blends were prepared by melt blending method. The effects of MPBO content on thermal and mechanical properties of the PA6/NMA/MPBO blends were studied by means of differential scanning calorimetry （DSC）, thermal gravimetric analysis （TGA）, heat distortion temperature, mechanical properties and melt flow rate test. The results showed that： with the increase of MPBO content, the crystallization and melting temperature, melting enthalpy and crystallinity of PA6/NMA/MPBO blends decreased, but the thermal stability first increased and then decreased ; when the MPBO content was 2 parts, the heat distortion temperature and tensile and bending strength reached the maximum of 72. 4℃, 80. 05 MPa and 106. 44 MPa respectively, which increased 26. 9%, 15.2% and 17% respectively compared with the pure PA6; when MPBO content was 3 parts, the melt mass flow rate of PA6/NMA/MPBO blends reached the minimum of only 0. 8 g/10min.