2007
DOI: 10.1021/ma061680e
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Characterization of Some New Olefinic Block Copolymers

Abstract: Exciting new developments in polyolefin synthesis give rise to olefinic block copolymers with properties typical of thermoplastic elastomers. The blocky copolymers synthesized by chain shuttling technology consist of crystallizable ethylene-octene blocks with low comonomer content and high melting temperature (hard blocks), alternating with amorphous ethylene-octene blocks with high comonomer content and low glass transition temperature (soft blocks). This paper describes the materials science of these unique … Show more

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Cited by 164 publications
(236 citation statements)
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“…The degree of crystallinity decreases with increasing content of soft segments; thus, the polymer changes from a rigid plastic to a soft elastomer [1][2][3].…”
Section: Open Accessmentioning
confidence: 99%
See 1 more Smart Citation
“…The degree of crystallinity decreases with increasing content of soft segments; thus, the polymer changes from a rigid plastic to a soft elastomer [1][2][3].…”
Section: Open Accessmentioning
confidence: 99%
“…The detection was performed in the refraction mode, a cobalt matrix was used for oligomers, sodium bromide was used as a cation source, and positive ionization was used. 1 H NMR spectra were recorded on a Varian 300 Fourier transform spectrometer (Varian Inc., CA, USA) operating at 300 MHz.…”
Section: Measurementsmentioning
confidence: 99%
“…When compared to random copolymers, OBCs in the solid-state have a unique crystal morphology and show improved physical properties such as compression set, elastic recovery, and abrasion resistance. [3,5] Figure 3 shows the analytical TREF profile comparing an olefin block copolymer (0.878 g/cc, 1.5 I 2 ) to a random copolymer (AFFINITY TM VP8770, 0.887 g/cc, 0.9 I 2 ) and a polymer blend (0.89 g/cc, 1.0 I 2 ) with components that are representative of the hard and soft segments within the olefin block copolymer. Although not a perfect comparison, the differences shown in Figure 3 cannot be reconciled by the slight differences in density and melt index of these polymers.…”
Section: Nuclear Magnetic Resonance (Nmr) Analysismentioning
confidence: 99%
“…Conventionally, PE and PP have been polymerized applying Ziegler-Natta catalyst. Development of metallocene catalyst provided the technologies for designing new types of polymers such as those with narrow molecular weight and composition distributions, controlled stereo regularity [1][2] , copolymerization [3][4][5][6][7] etc. Especially, development of polymers with elastomeric characteristics is widely investigated recently [8][9][10][11][12][13].…”
Section: Introductionmentioning
confidence: 99%