Determination of Compositional Heterogeneity in Copolymers by Thin Layer Chromatography. I. Preliminary Results for Styrene-Acrylate Copolymers

ABSTRACT:Copolymerization of ethylene with vinyl acetate was carried out at room temperature by the ternary catalyst system consisting of equimolar amounts of AlEts, ZnCh and CCk By solvent fractionation and thin layer chromatography analysis, the copolymerization product was found to consist of two different copolymer fractions. One was the 1 : 1 alternating copolymer and the other was identified with the copolymer produced by the usual free radical initiator under the same reaction conditions. Two different catalyst sites were assumed, i.e.,

Section: Resultsmentioning

confidence: 83%

“…The TLC analysis of the copolymerization product was performed by a procedure similar to that proposed by Inagaki et al 4 …”

Section: Thin Layer Chromatography (Tlc) Of the Copolymerization Productmentioning

confidence: 99%

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

Sàegusa

Yatsu

Miyaji

et al. 1970

“…The experimental procedures for TLC were similar to those described by Inagaki et al 7 Precoated plates (Analtech Uniplate Silicagel GF-2511) were used. The absorbent, silicagel, was activated by heating the plates at ll0°C for 1 h before use.…”

Section: Tlc Experimentsmentioning

confidence: 99%

Comparison of Cross Fractionation and TLC Methods in the Determination of the Compositional Distribution of a Statistical Copolymer

Teramachi

Hasegawa

Yoshida

1982

“…8 Experimental conditions specific to the present study are noted below. The adsorbents used were Silica Gel B-0 (Wako Chemicals Co., Tokyo) and Alumina Oxide G (E. Merck AG., Darmstadt).…”

Section: T Lc Proceduresmentioning

confidence: 99%

Thin-Layer Chromatographic Identification of Chain Architectures of Styrene—Butadiene Copolymers

Donkai

Miyamoto

Inagaki

1975

ABSTRACT:The feasibilities of thin-layer chromatography as a tool to identify the chain architecture of given copolymer samples have been investigated. To this end, styrene-butadiene (SB) block copolymers with known chain architecture were prepared and used as reference samples. Preliminary TLC experiments on these samples indicated that the random, tapered, diblock and triblock SB-samples could be chromatographically distinguished from one another under suitable development conditions. By applying the procedures thus established, the chain architecture of various commercial SB-products could be identified without appreciable interference from the molecular weight and composition.