Zobrazeno 1 - 10
of 40
pro vyhledávání: '"S. P. Chum"'
Publikováno v:
Journal of Applied Polymer Science. 113:3236-3244
This work compared the elastomeric properties of two low-crystallinity ethylene–octene copolymers. One was a block copolymer with lamellar crystals and the other was a random copolymer with fringed micellar crystals. The comparison of the stress–
Publikováno v:
Journal of Polymer Science Part B: Polymer Physics. 47:1313-1330
The ethylene-octene block copolymers in this study consist of long crystallizable sequences with low comonomer content alternating with rubbery amorphous blocks with high comonomer content. The crystallizable blocks form lamellae that organize into s
Publikováno v:
Polymer Engineering & Science. 48:642-648
The effect of thermal history on the oxygen permeability of biaxially oriented polypropylene (BOPP) films was investigated. Compression-molded sheets prepared with different cooling rates were biaxially oriented at several temperatures in the range b
Publikováno v:
Polymer. 49:1365-1375
Blocky ethylene–octene copolymers synthesized by chain-shuttling polymerization differ from statistical copolymers in their rapid rate of crystallization and in the formation of space-filling spherulites even when the crystallinity is as low as 7%.
Publikováno v:
Macromolecules. 40:2852-2862
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
Publikováno v:
Polymer Engineering & Science. 47:1658-1665
The effect of thermal history on the transparency of biaxially-oriented polypropylene (BOPP) films was investigated. Compression molded sheets prepared with different cooling rates were biaxially oriented at several temperatures. Correlations were so
Publikováno v:
Journal of Applied Polymer Science. 104:489-499
The elastic behavior of a propylene–ethylene copolymer was investigated. An initial “conditioning” tensile extension up to 800% strain resulted in an elastomer with low initial modulus, strong strain hardening, and complete recovery over many c
Publikováno v:
Journal of Applied Polymer Science. 107:1730-1736
Films of two isotactic propylene homopoly- mers prepared with different catalysts and a propylene/ ethylene copolymer were biaxially oriented under condi- tions of temperature and strain rate that were similar to those encountered in a commercial fil
Publikováno v:
Polymer. 47:6387-6397
The crystallization behavior and morphological patterns of a miscible blend of two propylene/ethylene (P/E) copolymers that differed in ethylene content were studied. Metallocene-catalyzed P/E copolymers containing 3.1 and 11.0 mol% ethylene were cho
Publikováno v:
Macromolecules. 39:1496-1506
Miscibility of homogeneous propylene/ethylene (P/E) copolymers of relatively narrow molecular weight distribution was studied as a function of constituent comonomer content. Polymers with up to 31 mol % ethylene were blended in pairs in order to vary