ABS树脂的核磁共振研究及单体含量对宏观性能的影响

摘要

收集国内市场上几种常用的ABS树脂颗粒,采用核磁共振(1H NMR、13C NMR)法测定丙烯腈-丁二烯-苯乙烯共聚物(ABS)的单体组分含量和序列分布,GPC法测定游离SAN分子量及分布.考察了单体种类、含量、SAN分子量及分布对ABS树脂的力学性能及物理性能的影响.结果表明,增加丁二烯含量有利于提高产品的冲击强度,但产品的密度会降低;增加苯乙烯含量可提高产品的熔体质量流动速率和密度;增加丙烯腈含量和SAN分子量,产品的冲击强度和拉伸强度都有所提升.最后总结出每种产品的特点及适用领域.%Several common acrylonitrile-butadiene-styrene (ABS) resin particles in the domestic market were collected to analyze their composition and macroscopic properties.The monomer content and sequence distribution of ABS were determined by nuclear magnetic resonance spectroscopy (1HNMR,13CNMR),and molecular weights and molecular weight distribution by gel permeation chromatography (GPC).The monomer type,monomer content,relative molecular weights and distribution of SAN were measured to evaluate ABS resins' mechanical and physical properties.The results show that the increase of butadiene content is beneficial to improve the impact strength of the product,but the density decreases.Increasing the styrene content will increase the melt mass flow rate and density of the product;and when raising the acrylonitrile content or the molecular weights of SAN,the impact and stretch strengths of the product are improved.Finally,the characteristics and the applicable areas of each product were summed up.