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Melting points are measured and equilibrium melting points calculated for hydroxybutyrate/hydroxyvalerate copolymers (PHB/HV) of varying molecular weight, containing 4 and 18% of hydroxyvalerate units. For low-HV copolymer, there is a significant reduction in melting point with molecular weight: values of equilibrium melting point in the range 176-188°C can be obtained from samples with molecular weight between 56 000 and 220 000. For the higher-HV copolymer, complex melting behaviour is observed, which suggests molecular-weight-dependent variations in the degree of exclusion of HV from the crystal lattice.

Посилання на статтю:

Variation in melting point with molecular weight for hydroxybutyrate/ hydroxyvalerate copolymers / S. J. Organ // Polymer. – 1993. – Vol 34. – P. 2175-2179.

Variation in melting point with molecular weight for hydroxybutyrate/ hydroxyvalerate copolymers - Завантажити.