Dual Site Character of AlEt3-ZnCl2-CCl4 Catalyst in the Copolymerization of Ethylene with Vinyl Acetate

Sàegusa, Takeo; Yatsu, Tadao; Miyaji, Satoru; Fujii, Hiroyasu

doi:10.1295/polymj.1.7

Cited by 10 publications

(5 citation statements)

References 3 publications

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“…Especially interesting is the bimetallic complex system AlEt3 -ZnCl2 which is the basis for alternating complex copolymerization 1870,1874,2453). ESR studies have been reported for the following aluminium alkyls: AlRC1 2 125 1), AlEt 2 Cl, AlEtCI 2 , AlEt32261), AlEt3-ZnCI22453), and AlEt2Cl-ZnCI2752, 788) for initiating polymerization and copolymerization.…”

Section: Cationic Polymerization Initiated With Lewis Acidsmentioning

confidence: 99%

ESR Spectroscopy in Polymer Research

Rånby¹,

Rabek²

1977

Polymers Properties and Applications

294

118

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Section: Cationic Polymerization Initiated With Lewis Acidsmentioning

confidence: 99%

ESR Spectroscopy in Polymer Research

Rånby¹,

Rabek²

1977

Polymers Properties and Applications

294

118

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“…The gross copolymerization product obtained by the pre-mixed catalyst system Q) has already been shown to consist of the ethylenerich random copolymer corresponding to spot A, and the 1 : I-alternating copolymer corresponding to spot B. 3 The parallel behavior of the two sets of spots strongly suggests that the copolymerization product obtained by the in-situ catalyst system likewise consists of random and 1 : 1-alternaung copolymers. The gross copolymers prepared by the in-situ catalyst system were then subjected to quantitative TLC analysis to determine the compositions of fractions A and B.…”

Section: Molecular Weightmentioning

confidence: 98%

“…The TLC analysis of the copolymerization product was performed by a procedure similar to that proposed by Inagaki, et al,4 and employed in our preceding paper. 3 A commerical silica gel (GF254, Merck AG, Darmstadt) was used as the stationary phase. The gel layer was activated at l 10°C for 1 hr immediately before use.…”

Section: Thin-layer Choromatography (Tlc) Of Product Copolymersmentioning

confidence: 99%

“…Solvent fractionation and thin-layer chromatography analyses showed that the I : I-alternating copoly-mer was accompanied by a random copolymer. 3 This fact suggested the coexistence of two kinds of catalytic sites in the catalyst system, i,e., one responsible for the alternating copolymerization and the other for the free-radical copolymerization. * Present address: Research Center, Mitsui Petrochemical Industries, Ltd., Wagi-cho, Kuga-gun, Yamaguchi-ken 740, Japan.…”

mentioning

confidence: 99%

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Alternating Copolymerization of Ethylene with Vinyl Acetate by AlEt3—ZnCl2—CCl4 Catalyst

Sàegusa

Yatsu

Fujii

1976

Polym J

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The behavior of the ternary catalyst system consisting of AlEta, ZnCb, and CC14, which enables the copolymerization of ethylene with vinyl acetate to produce a mixture of I : I-alternating and random copolymers was studied. By the adoption of in-situ catalyst preparation, whereby all the catalyst components were brought into contact in the presence of the monomers, the copolymerization product gained both in yield and in molecular weight. This was ascribable, by thin-layer chromatography analysis, to the increase in the yield and molecular weight on the part of the 1 : Ialternating copolymer. Varying the feed order of the catalyst components suggested that a bimetallic complex was formed between AlEta and ZnCb, and that the complex so formed made an important contribution to the alternating copolymerization. The 1 : I-alternating copolymer was formed with excellent selectivity by the procedure of aging the mixture of AlEta with ZnCl2 prior to the addition of CCl4. IR and NMR analyses further suggested that the bimetallic complex possibly has the ethyl group in a bridge across the aluminum and zinc atoms, and that vinyl acetate coordinates to the complex via not only the carbonyl group but also the carbon-carbon double bond to form a chelate structure.

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“…An improvement of the compatibility of the components in PP composites is achieved by using modifiers based on modified polyaminotriazoles [3,41 and copolymers of ethylene with acrylate and methacrylate comonomers containing nitrogen [5]. The effective use and estimation of the efficiency of modifiers in physical modification of PP fibres require the evaluation of i h e technological compatibility in the process of spinning [6, 71. A low compatibility with respect to polypropylene manifests itself by reduced processability and partial separation of the modifying component, which results in clogging of the spinning nozzle and breaking of the fibres.…”

Section: Introductionmentioning

confidence: 99%

Modifiers improving the dyeability of polypropylene

et al. 1989

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A number of copolymers on the basis of acrylate or methacrylate copolymers containing nitrogen and of ethylene copolymers containing structural units of N,N-diethyl-2-aminoethyl acrylate and 2,2,6,6-tetramethyl-4-piperidyl acrylate or of the vinyl ester of N,N-dimethyl-6-aminocaproic acid were synthetized. These copolymers wcre added to polypropylene before spinning. The dyeability of stretched fibres with acid dyestuffs was evaluated. Modifikatoren zur Verbesserung der Farbbarkeit von PolypropylenEine Anzahl Copolymere auf Basis von stickstoffhaltigen Acrylat-und Methacrylatcopolymeren sowie von Ethylencopolymeren, die N,N-Diethyl-2-aminoethyl-acrylat-oder 2,2,6,6-Tetramethyl-4-piperidylacrylat-Struktureinheiten enthalten, und auf Basis des Vinylesters der N,N-Dimcthyl-6-aminocapronsaure wurden synthetisiert. Diese Copolymere wurden dem Polypropylen vor dem Verspinnen zugesetzt. Die Anfarbbarkeit der gereckten Fasern mit sauren Farbstoffen wurde gepruft. Modu@utcamopbi d~u~ yAyuzuenuR oKpazuusaeMocmu nofiunponzuteiLaCHHTe3HpOBaH PRH COnOJIHMepOB H a OCHOBe a30TCOAepxta~HX aKpHJIaTHbIX H MeTaKpHJIaTHblX COnOJIHMePOB, a TaKH(e COIIOJIHMepOB 3THJIeHa, KOTOPbIe COAepxtaT CTPYKTYPHbIe 3BeHbR N,N-AHaTHJI-2-aMHH03THJI-aKpmnaTa IlJIH 2,2,6,6-TeTpaMeTHJI-4-nHnepH~HJIaKpHJIaTa H H a OCHOBe BHHHJIOBOrO 3@Hpa N,N-AHMeTHJI-&-aMHHOKanpOHOBO~ KHCJIOTIJ. ~T H cononHMepm 6b1nn ~0 6 a~n e~b 1 K nonnnponnneHy nepen @opMosameM. Mccnenosanacb oKpamusae-MOCTb BbITRHYTblX BOJIOKOH C KHCJIbIMH KpaCIlTeJIHMH.

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Dual Site Character of AlEt3-ZnCl2-CCl4 Catalyst in the Copolymerization of Ethylene with Vinyl Acetate

Cited by 10 publications

References 3 publications

ESR Spectroscopy in Polymer Research

ESR Spectroscopy in Polymer Research

Alternating Copolymerization of Ethylene with Vinyl Acetate by AlEt3—ZnCl2—CCl4 Catalyst

Modifiers improving the dyeability of polypropylene

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