Journal
MACROMOLECULAR RAPID COMMUNICATIONS
Volume 29, Issue 18, Pages 1549-1553Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/marc.200800350
Keywords
crystallization; graft copolymers; isotactic polystyrene; macromonomers; polyolefins
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Funding
- DFG [MU 836/5-3]
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Vinyl-terminated isotactic polystyrene macromonomers were copolymerized with ethylene and 1-octene to new polyolefin graft copolymers with crystallizable polystyrene side chains. The iPS content was varied from 4 to 78 wt.-% using different metallocene and halfsandwich catalysts. No solubility problems of the stereoregular macromonomer occured, because iPS does not crystallize during polymerization. In addition the polymers show nanophase separation of the polyolefin backbone and the iPS side chains. The crystallization of iPS, having a melting point of about 200 degrees C, can be achieved by annealing. This synthesis strategy allows the fabrication of a new class of thermoplastic elastomers with improved heat distortion temperatures.
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