Effect of temperature and HV monomer concentration on parameters of the unit cell of the PHB/HV biopolymer crystal

Changes of the unit cell parameters in the crystalline phase of the poly(β-hydroxy-butyrate- co-valerate) (PHB/HV) containing 0, 6, 15 and 22 mol% HV, during heating from room temperature to the melting point, were studied. It was found that unit cell expansion occurred with increasing HV monomer co...

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Bibliographic Details
Published in:Polymer (Guilford) 1997-03, Vol.38 (5), p.1239-1242
Main Authors: SKRBIC, Z, DIVJAKOVIC, V, PETROVIC, Z. S
Format: Article
Language:English
Subjects:
Applied sciences
bacterial polyesters
cell parameters
Exact sciences and technology
Organic polymers
PHB/HV
Physicochemistry of polymers
Properties and characterization
Structure, morphology and analysis
unit cell expansion
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Summary:Changes of the unit cell parameters in the crystalline phase of the poly(β-hydroxy-butyrate- co-valerate) (PHB/HV) containing 0, 6, 15 and 22 mol% HV, during heating from room temperature to the melting point, were studied. It was found that unit cell expansion occurred with increasing HV monomer concentration from 0 mol% to 22 mol%. The increase in lattice parameters a and b are almost linear with increasing concentration and the concentrational expansion coefficients in the direction a and b are about 6 × 10 −4 (mol%HV) −1 and 3 × 10 −4 (mol%HV) −1, respectively. The parameter c (fibre axis) remains unchanged. Temperature change causes unit cell expansion characterized by significant change of the parameter a only, with the linear coefficient of thermal expansion of about 1.3 × 10 −4 °C −1.
ISSN:0032-3861
1873-2291
DOI:10.1016/S0032-3861(96)00822-1