Variations of stress with temperature for stretched networks of trans‐polyisoprene networks in the crystallization region are reported. Such profiles are characteristically U‐shaped with the stress at lower temperatures often climbing to high levels. Valley widths of the profiles narrow as annealing temperature increases to about 50°C, then widen at yet higher temperatures. The degree of crystallization at 22°C is 37% and independent of deformation and annealing temperature. The β crystal form is ove…
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