| |
| |
| |
|
Modifikace izotaktického polypropylenu
Ličko, M. ; Jeníková, Z. ; Rybníček, J. ; Horník, J. ; Steidl, J. ; Raab, Miroslav
Injection moulded samples of polypropylene were used to study the effect of trigonal .beta.-phase and ethylene propylene rubber on mechanical-physical properties in respect to microstructure. The results were compared with pure isotactic polypropylene, .beta.phase induced by 0.33 weight percent of a nucleation reagent and 20 weight percent of EPM rubber increases the toughness of iPP. A substantial increase in toughness was observed by combining both additives resulting in spherolite refinement and reduction in amorphous content. However, the improvement in toughness was at the expense of the yield strength and modulus of elasticity.
|
| |
|
Polymers and people
Raab, Miroslav
This lecture offers a chronological survey of the most important inventions in polymeric materials and their inventors. Special attention is devoted to the role of serendipity that seemingly assisted to some great discoveries.
|
| |
| |
|
Polymer nanomaterials and nanoprocesses in polymers
Raab, Miroslav
Polymeric nanomaterials and nanoprocesses in polymers. Polymeric nanomaterials have been attracting great interest both from scientific and technological points of view. The basic ways to nanomaterials with polymeric matrix are reviewed together with the methods for their structural characterization. These methods are suitable also for the study of nanoprocesses in polymers.
|
| |