Title: SEMI-CONTINUOUS SHEAR FLOW INVESTIGATION INTO MEDIUM AND HIGH MOLECULAR WEIGHT POLYHYDROXYBUTYRATE BLENDS
Page Range: p.161-165
Author(s): Sharma L; Ogino Y; Kanaya T; Iwata T; Doi Y
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 15
Issue No: No.2
Abstract
Changes were investigated in the morphology of medium and high molecular weight polyhydroxybutyrate blends (MMWT/HMWT PBB) during shearing, using various in-situ rheological methods. Four PHB blends of medium and high molecular weight species were investigated in order to establish a relationship between molecular weight, shear technique and morphology in PHB. On single shearing, fibres were formed only at the highest MMWT/HMWT ratio of 97/3. This was attributed to a critical orientation molecular weight. Fibre formation took place with all compositions, and there was a rapid initial shish formation on multiple shearing. This is claimed to be evidence for a partial shish based on the Janeschitz-Kriegl model. 21 refs.
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