The Effect of Deformation History on the Morphology and Properties of Blends of Polycarbonate and a Thermotropic Liquid Crystalline Polymers
Abstract
The addition of an immiscible LCP phase improves the melt processability of a host thermoplastic polymer. In addition, by employing a suitable deformation history, the LCP phase may be elongated and oriented such that a microfibrillar morphology can be retained in the solid state. This has important ramifications for the development of self-reinforcing polymer blends to compete with conventional inorganic fiber-reinforced polymers. Shear flows are generally ineffective at developing these morphologies, but flows that incorporate an extensional region, such as the converging flow found at the entrance to a capillary or die can produce an elongated LCP phase. Simple extensional flows, such as melt drawing, are most effective at producing LCP microfibrils, and their efficiency increases with increasing draw ratio. The moduli of highly drawn blends were well approximated by a composite's analogy of long uniaxially oriented LCP fibers in a PC matrix. Liquid crystalline polymers, Polymer blends.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 11, 1989
- Accession Number
- ADA203632
Entities
People
- A. Kohli
- N. Chung
- Robert A Weiss
Organizations
- University of Connecticut