Journal Article10.1002/MARC.1995.030160403
Synthesis of polypropene‐block‐poly(ethylene‐co‐propene) by short‐period polymerization with MgCl2‐supported Ziegler catalyst
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TL;DR: In this article, a short-period polymerization method was successfully applied to the synthesis of a diblock copolymer, polypropene-block-poly(ethylene-co-propene), which was carried out for ca. 0,1 s with a MgCl2-supported Ziegler catalyst.
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Abstract: The short-period polymerization method was successfully applied to the synthesis of a novel diblock copolymer, polypropene-block-poly(ethylene-co-propene). The polymerization was carried out for ca. 0,1 s with a MgCl2-supported Ziegler catalyst. The copolymers obtained showed unimodal curves in gel-permeation chromatography without any peak in the low-molecular-weight region. After extraction with heptane, the fraction of poly(ethylene-co-propene) remained unchanged in the copolymer but disappeared in a commercial so-called block-type copolymer. All the results the formation of polypropene-block-poly(ethylene-co-propene), in which poly(ethylene-co-propene) is chemically linked with polypropene.
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Citations
Specific Roles of Al‐Alkyl Cocatalyst in the Origin of Isospecificity of Active Sites on Donor‐Free TiCl4/MgCl2 Ziegler‐Natta Catalyst
TL;DR: In this paper, the formation, deactivation and transformation of stereospecific active sites on the donor-free TiCl 4 /MgCl 2 catalyst induced by short time reaction with triethylaluminium (TEA) cocatalyst (pretreatment time: 0∼60 s) were investigated by stopped-flow propylene polymerization combined with temperature rising elution fractionation (Tthis paper) and gel permeation chromatography (GPC) methods.
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Structure and Mechanical Behavior of the Mesomorphic Form in a Propylene- b -Poly(ethylene- co -propylene) Copolymer and Its Comparison with Other Thermal Treatments
TL;DR: In this article, a mesomorphic form of polypropylene-b-(ethylene-co-propylene) was obtained by quenching in a dry ice/methanol bath after melting, and an exhaustive analysis of such a mesophase has been performed comparing its morphological details and mechanical properties with the rest of thermal treatments.
Formation, deactivation and transformation of stereospecific active sites on TiCl4/dibutylphthalate/Mg(OEt)2 catalyst induced by short time reaction with Al-alkyl cocatalyst
TL;DR: In this article, the formation and deactivation of active sites with broad multiplicity in isospecificity on the Ziegler-Natta catalyst were investigated by stopping-flow propene polymerization combined with temperature rising elution fractionation (Tthis article) and GPC methods.
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Patent
Propylene block copolymer, process for preparation thereof and propylene resin composition comprising same
Kazuyuki Watanabe,Hisayoshi Yanagihara +1 more
- 26 Jun 1996
TL;DR: In this paper, a polypropylene block copolymer with a crystallization temperature curve determined by a differential scanning calorimeter has been shown to have a high soluble content on xylene extraction at 25°C and a proportion of the area of the secondary peaks to the main peak.
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Living polymerizations of propylene and syntheses of atactic polypropylene-block-poly(ethylene-co-propylene) using metallocene catalyst systems
Yoshifumi Fukui,Murata Masahide +1 more
TL;DR: In this paper, atactic polypropylene-(ethylene-co-propylene) (ataPP/EP) block copolymers were prepared by the addition of ethylene monomer during the living polymerization of propylene at low temperature.
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References
Stopped flow polymerization of propene with typical MgCl2-supported high-yield catalysts
TL;DR: In this article, a new method, viz. stopped flow polymerization, has been employed to observe the quasi-living polymerization state of propene, and it was found that the molecular weight distribution was maintained constant from the very start of the polymerization process (after 0.1 s).
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Annealing of commercial block polypropylene. I. Thermal and physical properties
TL;DR: In this paper, the effect of annealing on the impact strength of block copolymer (block PP) moldings is investigated and it is shown that the effect is due to changes of fine texture and morphology of crystallites and is explicable by recrystallization and polymer diffusion.
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