Thermomechanical properties of poly(1‐butene) synthesized by Ziegler–Natta catalyzed polymerization of 1‐butene in the presence of nucleating agents

Abstract

Isotactic poly(1-butene)s (iPBs) were synthesized via bulk polymerization of 1-butene in the presence of a series of nucleating agents (NAs). The effects of the NAs on the polymerization, crystallization and mechanical properties of the resultant iPBs were systematically investigated. Both ⊍and ⊎-NAs effectively improve the impact resistance of iPB. Specifically, the addition of ⊎-NAs increases the molecular weight, tensile strength, elastic and flexural moduli of iPB without affecting catalytic activity during polymerization, while the ⊍-NAs have no affirmative effect on improving the tensile strength and elastic modulus of iPB. The ⊎-NAs also accelerate the crystal transition rate of iPB from form II to form I.

Effects of zinc isophthalate on the crystallization and crystal transformation behavior of polybutene alloy

“…For example, Mult-920 (a kind of NA with amide structure) was useful to increase the crystallization rate according to the study carried out by Zhao et al [44] and the non-isothermal crystallization kinetics were tested as well. Cui et al [45] investigated the effect of four commercial NAs (WBQ-88, WNA-108, WBG-II and WBG-F) which were added during polymerization on PB. It was found that WBG-II, WBG-F and WNA-108 had the ability to accelerate the rate of crystal transformation while WBQ-88 didn't.…”

Effects of nucleating agents on the II–I transition of iPB-1

“…Similar experimental observations have been reported after addition of ZnIA, 51 MWCNT, 52 or β-NA. 53 Kaszonyiova 29,54 further extended their work on processes of melt-II, III-I and III-II transitions of iPB-1. Most of the studies phenomenally focused on form II melt crystallization kinetics or on the following II-I transition kinetics.…”