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Synthesis of poly(1‐hexene)s end‐functionalized with phenols
Author(s) -
Yanjarappa Mallinamadugu J,
Sivaram Swaminathan
Publication year - 2005
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.1848
Subject(s) - 1 hexene , polymer chemistry , phenol , catalysis , hexene , reagent , selectivity , polymerization , chemistry , molar mass distribution , materials science , organic chemistry , polymer , ethylene
Electrophilic alkylations of phenol/2,6‐dimethylphenol were performed with vinylidene‐terminated poly(1‐hexene)s using BF 3 ·OEt 2 catalyst. Vinylidene‐terminated poly(1‐hexene)s with M n varying from 400 to 10000 were prepared by bulk polymerization of 1‐hexene at 50 to −20 °C using Cp 2 ZrCl 2 /MAO catalysts. The phenol/2,6‐dimethylphenol‐terminated poly(1‐hexene)s was characterized by NMR ( 1 H, 13 C), UV, IR and vapor phase osmometer (VPO). The isomer distribution ( ortho, para and ortho / para ) was determined by 13 P NMR using a phosphitylating reagent, namely 2‐chloro‐1,3,2‐dioxaphospholane. The number‐average degree of functionality ( F n ) >0.9 with >95% para selectivity could be achieved using low‐molecular‐weight oligomers of poly(1‐hexene)s. Copyright © 2005 Society of Chemical Industry