الفهرس 
IntroductionOnly 14 pages are availabe for public view
 |  | from | 169 |  |  |
| | | from | 169 | | |
Abstract
The opportunity to develop superior products for the structural applications has sustained the interest in plastic materix(PMCs). HDPE has a good low temperature performance but a poor adhession to the reinforcement materials in the PMCs. conversely,PP has a good interfacial adhesion in PMCs but a poor low temperature peerformance.Therefore, replacement of HDPE and PP based composites with compatible HDPE/PP based composites is expected to provide composite systems with a superior performance.
Accordingly, this thesis is devoted to prepare isotropic compatible HDPE/PP blends and to employ the molecular composites theory for the optimization of such blends for the structural applications requirements.
Injection molding grades of HDPE and PP haveing matched physical properties were melt mixed twice in a single screw extruder in order to prepare blends of varying composition.
Then isotropic sheets of the homopolymers and blends were prepared by compression molding. In this process, the molded sheets were water cooled with a rate of 18C/min.
After that, afull morphological and structural characterizations of the prepared materials were carried out.In addition,some of the structurally important mechanical and thermal properties were characterized. Such characterizations were performed in order to investigate whether or not the blends are compatible and hence acceptable for the structural applications.Additionally,to provide the database necessary to evaluate the validity of the modified molecular composites model in predicting the young’s modulus and thermal expansioin coefficient of isotropic HDE/PP blends.