Polyisoprene spherulites

Andrews76 gave results of the work of Reed and Martin on cis-polyisoprene specimens crystallized from a strained cross linked melt and on solid state polymerized poly-oxymethylene respectively, explaining the results by simple two phase models. He also summarized the studies of Patel and Philips775 on spherulitic polyethylene which showed that the Young s modulus increased as a function of crystallite radius by a factor of 3 up to a radius of about 13 n and then decreased on further increasing spherulite size. 

A typical optical micrograph for trans-1,4-polyisoprene crystallized from the melt is given in Fig. 10 where a spherulite morphology is observed.Spherulite structures can also be obtained by solvent evaporation from a thin layer of a dilute trans 1,4 polyisoprene solution, as seen in Fig. 11. 

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