Microhardness-structure correlation of iPP/EPR blends : influence of molecular weight and EPR particle content
The influence of molecular weight on the mechanical properties of isotactic poly(propylene) (iPP) and iPP blended with ethylene-propylene copolymers has been investigated by means of the microhardness technique. The hardness (H) of iPP is shown to slightly decrease with increasing molecular mass, wi...
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| Veröffentlicht in: | Colloid and polymer science 1998-09, Vol.276 (9), p.786-793 |
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| container_title | Colloid and polymer science |
| container_volume | 276 |
| creator | FLORES, A AURREKOETXEA, J GENSLER, R KAUSCH, H. H BALTA CALLEJA, F. J |
| description | The influence of molecular weight on the mechanical properties of isotactic poly(propylene) (iPP) and iPP blended with ethylene-propylene copolymers has been investigated by means of the microhardness technique. The hardness (H) of iPP is shown to slightly decrease with increasing molecular mass, within the range of molecular weights investigated. The H-decrease is correlated to a loss of crystallinity as the average molecular weight increases. On annealing, the mechanical properties are enhanced as a consequence of an increase in both, the degree of crystallinity and the crystalline lamellar thickness. A value of H^sup ∞^^sub c^ for iPP crystals of infinite thickness in the α-form is proposed for the first time. The inclusion of EPR particles in the iPP matrix softens the material. This result could be explained in terms of an increase in the basal surface free energy of the iPP crystals with increasing amount of rubber content.[PUBLICATION ABSTRACT] |
| doi_str_mv | 10.1007/s003960050311 |
| format | Article |
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| issn | 0303-402X 1435-1536 |
| language | eng |
| recordid | cdi_proquest_journals_1872811152 |
| source | Springer Nature - Complete Springer Journals |
| subjects | Applied sciences Exact sciences and technology Mechanical properties Microhardness Molecular weight Organic polymers Physicochemistry of polymers Properties and characterization |
| title | Microhardness-structure correlation of iPP/EPR blends : influence of molecular weight and EPR particle content |
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