Chemistry Reference
In-Depth Information
ABSTRACT
The structure and physical properties of the thermoplastic vulcanizates
(TPE-V) produced in the process of the reactive processing of polypropyl-
ene (PP) and ethylene-octene elastomer (EOE) in the form of alloy, using
the cross-linking system was analyzed. With the DMTA, SEM and DSC
it has been demonstrated that the dynamically produced vulcanizates con-
stitute a typical dispersoid, where semicrystal PP produces a continuous
phase, and the dispersed phase consists of molecules of the cross-linked
ethylene-octene elastomer, which play a role of a modifier of the proper-
ties and a stabilizer of the two-phase structure. It has been found that the
mechanical as well as the thermal properties depend on the content of the
elastomer in the blends, exposed to mechanical strain and temperature.
The best results have been achieved for grafted/cross-linked blends with
the contents of iPP/EOE-55/45%.
8.1 INTRODUCTION
The structure and physical properties of the thermoplastic vulcanizates
(TPE-V) produced in the process of the reactive processing of polypropyl-
ene (PP) and ethylene-octene elastomer (EOE) in the form of alloy, using
the cross-linking system was analyzed. With the DMTA, SEM and DSC
it has been demonstrated that the dynamically produced vulcanizates con-
stitute a typical dispersoid, where semicrystal PP produces a continuous
phase, and the dispersed phase consists of molecules of the cross-linked
ethylene-octene elastomer, which play a role of a modifier of the proper-
ties and a stabilizer of the two-phase structure. It has been found that the
mechanical as well as the thermal properties depend on the content of the
elastomer in the blends, exposed to mechanical strain and temperature.
The best results have been achieved for grafted/cross-linked blends with
the contents of iPP/EOE-55/45%.
The thermoplastic elastomers (TPE) are a new class of the polymeric
materials, which combine the properties of the chemically cross-linked
rubbers and easiness of processing and recycling of the thermoplastics
[1-8]. The characteristics of the TPE are phase micrononuniformity and
specific domain morphology. Their properties are intermediate and are in
the range between those, which characterize the polymers, which produce
the rigid and elastic phase. These properties of TPE, regardless of its type
