The equilibrium thermodynamic properties and crystallization behavior of poly(p-phenylene succinate) (PPSc) were examined using differential scanning calorimetry (DSC) and a wide-angle X-ray diffractometer. When PPSc quenched into liquid nitrogen, the PPSc still showed 60 J/g of the heat of fusion,
Properties of fabricated poly-p-phenylene
β Scribed by David M. Gale
- Publisher
- John Wiley and Sons
- Year
- 1978
- Tongue
- English
- Weight
- 234 KB
- Volume
- 22
- Category
- Article
- ISSN
- 0021-8995
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β¦ Synopsis
Abstract
Mechanical properties of fabricated polyβpβphenylene (PB) parts are compared to those of commerical polyimide. PB showed excellent retention of strength and stiffness at high temperature. Results of environmental exposure and properties of some PB composites are included. In general, PB parts have properties between those of commercial polyimide and carbon graphite.
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We investigate the quasi-particle conformational defects (excitons, polarons and bipolarons) in phenylene vinylene oligomers (PVOs) consisting of up to 12 repeat units. The conformations are determined by minimisation of the total Hartree-Fock energy calculated at 3-21G level. The Hartree-Fock calcu
A new p-phenylene-vinylene-thiophene-based siloxane block copolymer has been synthesized. The copolymer consists of alternating rigid and flexible blocks. The rigid blocks are composed of phenylene-vinylene-thiophene-based units, and the flexible blocks are derived from 1,3-dialkyldisiloxane units.
The high temperature properties of Poly( p-phenylene-2,6-benzobisoxazole) (PBO) fiber are examined and compared with those of the p-Aramid fiber. In particular, the temperature dependence of tensile strength of the PBO fiber is reported for the first time. The PBO fiber has 100ΠC higher decompositio