The use of glass transition data for characterizing polycarbonatebased blends
β Scribed by M.J. Guest; J.H. Daly
- Publisher
- Elsevier Science
- Year
- 1989
- Tongue
- English
- Weight
- 226 KB
- Volume
- 25
- Category
- Article
- ISSN
- 0014-3057
No coin nor oath required. For personal study only.
β¦ Synopsis
Partitioning of low molecular weight species, such as oligomers, during melt blending is shown to contribute to relative shifts in recorded glass transition temperatures for immiscible blends of bisphenol-A polycarbonate and styrene/acrylonitrile copolymers. These observations indicate the problems in drawing conclusions about miscibility between two polymers solely from shifts of 'one-number' Tg values.
π SIMILAR VOLUMES
In this paper a new method based on the determination of heat capacity increment at the glass transition (β¬Cp) is presented to quantify the effectiveness of compatibilizers for immiscible polymer blends. In order to show the validity of the method, two immiscible blends, polypropylene-poly(ethylene
## Abstract Mixtures of high molecular weight polystyrene (__P__~n~ = 961.5; __T__~g~ = 373 K) and __secβ__butylβterminated oligostyrene (__P__~n~ = 10.6; __T__~g~ = 302 K) show a dependence of the glass transition on the composition (i.e. numberβaverage molecular weight) which cannot be described