恒黏剂对恒黏天然橡胶生胶分子结构及动态力学性能的影响

Effect of constant viscosity agent on molecular structure and dynamic mechanical properties of raw constant viscosity natural rubber

用门尼黏度仪、凝胶渗透色谱仪和橡胶加工分析仪分析了恒黏剂盐酸羟胺、盐酸氨基脲制备的恒黏天然橡胶生胶的门尼黏度、相对分子质量及其分布和动态力学性能。结果表明,相比于盐酸氨基脲,盐酸羟胺对天然橡胶门尼黏度、相对分子质量及其分布和动态力学性能有更大的影响。盐酸羟胺基恒黏天然橡胶的门尼黏度和相对分子质量均明显低于天然橡胶,弹性模量在低频率范围随频率增大而增加的幅度明显小于天然橡胶,损耗因子随应变的增大明显大于天然橡胶,复数黏度对剪切速率的敏感度小于天然橡胶。

The Mooney viscosity,relative molecular mass and its distribution,dynamic mechanical properties of raw constant viscosity natural rubber prepared with hydroxylamine hydrochloride and semicarbaside hydrochloride as constant viscosity agent were measured with Mooney viscometer,gel permeation chromatograph and rubber processing analyzer,respectively.The results showed that compared to semicarbazide hydrochloride,hydroxylamine hydrochloride had a more significant impact on Mooney viscosity and relative molecular mass of natural rubber.The Mooney viscosity,relative molecular mass of hydroxylamine hydrochloride-based natural rubber were evidendy lower than those of natural rubber,and the increase rate of elastic modulus of the former was less than that of the latter with increasing frequency at lower frequency,the increase rate of lose factor of the former was larger than that of the latter with increasing strain,and the sensitivity of shear rate for complex viscosity of the former was smaller than that of the latter.