The relaxation phenomena of polymers are very important because they play an important role in their physical properties. Dynamic mechanical analysis was used in this work in order to study the effect of tactic and compositional sequences on the relaxation processes observed in poly(vinyl chloride) (PVC). The polymers studied in this work were PVC modified by means of reductive hydrogenation and chlorination reactions at low degrees of modification. The results obtained with hydrogenated poly(vinyl chloride) indicated that the decrease in mmr tetrads at the end of the isotactic sequences in the chain by stereospecific hydrogenation led to concomitant decreases in intensity and temperature of the maximum of the β relaxation. This effect seemed to be stronger the longer the isotactic sequence associated with the said structure. On the other hand, in the case of chlorinated poly(vinyl chloride) (CPVC), the results of the evolution of the β relaxation with the degree of chlorination showed that the predominant factor was the compositional microstructure (substitution of hydrogen atoms by chlorine atoms, increasing the possibility of inter-chain interactions leading to a stiffening of the chain, with the consequent increase in the β temperature).

聚合物的松弛现象非常重要，因为它们在其物理性质中起着重要的作用。为了研究策略和组成顺序对聚氯乙烯（PVC）中松弛过程的影响，使用了动态力学分析。在这项工作中研究的聚合物是通过低度改性的还原性氢化和氯化反应对PVC进行改性的。用氢化聚氯乙烯获得的结果表明，通过立体有择加氢，链中等规序列末端的mmr四联体减少，导致β最大值的强度和温度随之降低。松弛。与所述结构相关的等规序列越长，该作用似乎越强。另一方面，在氯化聚氯乙烯（CPVC）的情况下，β弛豫随氯化程度的演变结果表明，主要因素是组成的微观结构（氢原子被氯原子取代） ，增加了链间相互作用导致链变硬的可能性，从而导致β温度升高。