反应加工体系PVC/PHMS的转矩流变性能研究(Ⅰ)

含氢聚甲基硅氧烷;聚氯乙烯;反应加工体系PVC/PHMS的转矩流变性能研究(Ⅰ)

Torque Rheological Property of PVC/PHMS in Reactive Processing

Polyvinyl chloride(PVC) was chemically modified with polyhydromethylsiloxane(PHMS) via reactive processing in a Haake Rheomix 600P mixing mill. Two kinds of PHMS with different contents of Si-H (202 #PHMS and 206 #PHMS) were used to reduce the maximum torque( TQ max ) of PVC. On increasing the 206 #PHMS amount, the equilibrium torque( TQ eq ) of PVC increased slightly and passed through a maximum at 0 2 phr of 206 #PHMS. In contrast, the TQ eq of PVC modified with 202 #PHMS increased continuously with increase in 202 #PHMS content. Furthermore, the gelating melting time for PVC modified with 202 #PHMS was shorter than that for PVC with 206 #PHMS. With addition of PHMS the equilibrium temperature( T eq ) of PVC increased firstly and then decreased. PHMS was able to decrease not only the total energy( TTQ eq ) consumed in the reactive processing but also the consumption rate of energy in the initial period of the reactive processing.