Rheological and thermal degradation properties of hyperbranched polyisoprene prepared by anionic polymerization.

ABSTRACT: Hyperbranched polyisoprene was prepared by anionic copolymerization under high vacuum condition. Size exclusion chromatography was used to characterize the molecular weight and branching nature of these polymers. The characterization by differential scanning calorimetry and melt rheology indicated lower T_g and complex viscosity in the branched polymers as compared with the linear polymer. Degradation kinetics of these polymers was explored using thermogravimetric analysis via non-isothermal techniques. The polymers were heated under nitrogen from ambient temperature to 600°C using heating rates from 2 to 15°C min^-1. Three kinetics methods namely Friedman, Flynn-Wall-Ozawa and Kissinger-Akahira-Sunose were used to evaluate the dependence of activation energy (

SUBMITTER: Habibu S 

PROVIDER: S-EPMC6894563 | biostudies-literature | 2019 Nov

REPOSITORIES: biostudies-literature