Hot drawing of partially miscible blends of polycarbonate and poly(butylene terephthalate)

✍ Scribed by B. J. Reekmans; K. Nakayama

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 617 KB
• Volume: 62
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19961003)62:1<247::aid-app28>3.0.co;2-0

✦ Synopsis

Samples of P C -P B T blends over the entire composition range were drawn at 160OC to high extensions, 2.1-5.8, t o study the mechanical reinforcement and the molecular structure development upon deformation. Elastic modulus E' increases with extension ratio for all compositions and temperatures. Blends with 25 and 40 wt % of P C show higher E' at low temperature than pure P B T blends do. Crystallinity increases with extension ratio and is relatively smaller with increasing P C content. T h e influence o f t h e reversible a t o p crystal form transformation was also studied. T h e second moment of the orientation function f for both crystal forms increases to high values > 0.9 at relatively low extensions.fdecreases with P C content for a crystals but decreases for p crystals. T h e a fraction is high for P B T and decreases with P C content and extension ratio in the blends. Strain recovery experiments show that the (Y to p transformation is also elastic in nature a t high extension ratios and that the reinforcing effect in high P B T content blends is not due t o the a/@ ratio.