CHEM 4214 Lecture Notes - Lecture 27: Glass Transition, Cross-Link, Elastomer
Document Summary
Particle form factor correction replace rg with r fix problem 2 of hw. -> can get rid of sol fraction by putting in organic solvent, then just leaves you with gel fraction. 2 ways to make polymer network: vulcanization -> 1,4-polyisoprene has double bond in backbone --> can then open up later with sulfur (s8) (founded by goodyear in 1844) to attack the double bond and then form cross-link. -> low glass transition temperature (at room temperature, it"s a cross-linked liquid) --> called. How many x-links needed to create a network? if have sample with only 1 mw. 3rd, p + p + p at n, have (n - 1)p then if find cross-link, now move down that polymer (red) and keep doing that x = # connected chains. Polydisperity we are randomly picking up monomers, so. 1st way to make polymer was vulcanization: polymerizaiton of multifunctional monomers.
