Polycaprolactone Polymer segment

The transition temperatures were essentially the same for a similar type of polymers regardless of molecular weight range In this study. The lower transition (-86 C) In the B-CL of 70-30 wtX dlblock Is associated with Tg of the polybutadiene block and the upper transition (56 C) with the crystalline melting temperature of polycaprolactone segment No polycaprolactone Tg (about -60 C for Its amorphous part) was observed In the B-CL dlblock, evidently because of Its lowr content and proximity to the polybutadiene Tg. It can be detected at -59 C, however. In the S/B-Cl of 33/44-23 wt% dlblock terpolymer. In the latter, the Tg of the S/B block (-20 ) was essentially the same as the random S/B copolymer control which Is coded as S/B-CL 33/44-0 iftZ In Table IV. 

Meng Q, et al. Polycaprolactone-based shape memory segmented polyurethane fiber. J Appl Polym Sci 2007 106 2515-23. 

Kavlock KD, Whang K, Guelcher SA, Goldstein AS. Degradable segmented polyurethane elastomers for bone tissue engineering effect of polycaprolactone content J Biomater Sci Polym Ed 2013 24(l) 77-93. 

Meng Q.H., Hu J., Zhu Y, Lu J. and Liu Y. (2007), Polycaprolactone-based shape memory segmented polyurethane fiber. Journal of Applied Polymer Science, 106 pp. 2515-2523. 

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. 

---