Polycaprolactone branched

The promising results by Huber et al. [37] and Choi and Kwak [38] with a reduction in the migration of highly branched polyesters to hexane and polymer substrates suggested that the introduction of branches in the plasticizer structure could be an effective way to prevent the release of plasticizer also in aqueous environments. Volatihty, extractabihty, and exudation tests for PVC/hyperbranched polycaprolactone showed that there was no plasticizer migration even at very harsh conditions, while 7-78% of additives in PVC/DEHP migrated out of the samples [91]. 

Figure 5. Plots of intrinsic viscosities vs. degree of branching of hyperbranched polycaprolactones in CHCI3 and THF at 20 and 50 °C resp.

The [T ] value of a branched polymer is smaller than that of the corresponding linear polymer. The MHS equation of a segmented polyurethane, synthesised from methylenebis (4-phenyl isocyanate), polycaprolactone and 2-aminoethanol in N, A -dimethylacetamide shows upward curvature at Mw 10 owing to an increase in the degree of branching per molecule in the region of 10 [41]. Therefore, it should be noted that of the branched polymer cannot be unconditionally determined by using the MHS equation established for the linear polymer. 

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