电子束辐照对二聚酸型聚酰胺/非晶型α-烯烃共聚物共混体系性能的影响

Effect of electron beam irradiation on properties of dimeric acid polyamide/amorphous poly-α-olefin copolymer blends

为拓宽非晶型α-烯烃共聚物在热缩材料行业的应用,本文通过引入二聚酸型聚酰胺改性非晶型α-烯烃共聚物,采用中能电子加速器研究吸收剂量对二聚酸型聚酰胺/非晶型α-烯烃共聚物共混体系的软化点、凝胶含量、DSC特性和流变学性能的影响。结果表明:当二聚酸型聚酰胺的质量占比≤25%时,二聚酸型聚酰胺/非晶型α-烯烃共聚物共混体系呈现辐射降解特性,共混体系的软化点、储能模量G’和损耗模量G’随温度的变化曲线交点对应的温度T_(j)、特性黏度|η^(*)|随吸收剂量增加而降低;在振荡变温测试过程中,相位角随吸收剂量的升高而增加,出现明显的黏弹性转变。当二聚酸型聚酰胺的质量占比≥50%时,共混体系呈现辐射交联特性,共混体系的黏弹性转变受温度的依赖程度和特性黏度|η*|受频率的依赖程度随着吸收剂量升高都减弱。

To broaden the application of amorphous poly-α-olefin copolymer in the heat shrinkable material industry,in this study,effects of absorbed dose on the softening point,gel content,DSC properties and rheological properties of dimer acid polyamide/amorphousα-olefin copolymer blends were studied.When the mass ratio of dimer acid polyamide was≤25%,dimeric acid polyamide/amorphousα-olefin copolymer blends presented radiation degradation characteristics,the softening point,the corresponding temperature Tj of the intersection of the storage modulus G′and loss modulus G″with temperature change,and intrinsic viscosity|η*|decreased with absorbed dose increasing;during the oscillating temperature test,the phase angle increased obviously with absorbed dose increasing,which showed viscoelastic transition characteristics.When the mass ratio of dimer acid polyamide was≥50%,the blends presented radiation crosslinking characteristics,the dependence of viscoelastic transition on temperature and the dependence of intrinsic viscosity on frequency were reduced with absorbed dose increasing.