Sulfur Dioxide → HCID 86732912, compound

Participants

Reaction Steps

In a preferred embodiment, which is intended to be illustrative only, to polyisobutylene having a molecular weight of about 4 × 106 and dissolved at a level of 5 grams in 100 ml of n-heptane is added 20 ml of liquid sulfur dioxide at a temperature of 0°C. Ten grams of norbornene dissolved in 10 ml of n-heptane is added and this mixture is agitated at 10,000 rpm for 5 minutes. The agitation is terminated and a block copolymer of polyisobutylene and norbornene-sulfur dioxide is isolated by precipitating in methanol. This material is found to have incorporated 7.2 wt. % sulfur. On this basis, the material is compared to a physical mixture of polyisobutylene and a norbornene sulfur dioxide copolymer at equal levels of sulfur. It is found that the block copolymer shows substantially greater modulus as compared to the physical mixture described.

Provenance & Evidence