Studies Leading to Iodine-Tagged Crosslinked Polybutadiene

Citation

Clarke, Mildred Allen (1971) Studies Leading to Iodine-Tagged Crosslinked Polybutadiene. Master's thesis, California Institute of Technology. doi:10.7907/7951-NC71. https://resolver.caltech.edu/CaltechTHESIS:04222010-090826127

Abstract

Work leading to the synthesis of uniformly crosslinked poly-butadiene with iodine tags at both ends of a small percentage of the crosslinking chains is described. The following reactions have been investigated: conversion of dibromopolybutadiene to diiodopolybutadiene; conversion of dihydroxypolybutadiene to polybutadiene diisocyanate; chain extension of polybutadiene diisocyanate with 3-dirnethylamino-1, 2-propane-diol to form a linear polybutadiene with pendant dimethylamino groups (PBPA); crosslinking of the PBPA by quaternization of the amine groups with diiodopolybutadiene; and formation of the amine salt of PBPA by treatment with hydrochloric acid. Mechanical properties of PBPA, its HC1 salt, and the cross-linked polybutadiene were determined by free torsional oscillation. Salt formation apparently leads to pseudo-crosslinking of the polymer by association of the ionic groups, so that the polymer exhibits elastomeric behavior between -30° and 40°C. Crosslinking of PBPA by quaternization of the amine groups with diiodopolybutadiene extends the elastic region to 130°C, where creep begins due to degradation of the polymer.

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