Abstract
On heating, crystallinity of branched nylon 3 (prepared by hydrogen transfer polymerization of acrylamide) increases through two successive crystallizations which give two exotherms in DTA at 115 and 260°. The first is interpreted as a “cold crystallization” and the second as a crystallization occurring when the most imperfect crystalline regions begin to melt. Both crystallizations involve a reorganization of polymer chain segments into higher order or larger size crystallites and depend on the content of branching structural units in the samples. A maximum is found in the heat evolved during crystallization for samples of intermediate branching content, since these polymers can considerably increase their crystallinity on heating: on the contrary, lightly branched samples are already quite ordered as prepared and largely branched samples can only slightly improve their poor crystallinity.
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