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Starve fed emulsion copolymerization of vinyl acetate and 1-hexene at ambient pressure
KTH, Skolan för kemivetenskap (CHE), Fiber- och polymerteknik, Polymera material.ORCID-id: 0000-0002-7348-0004
KTH, Skolan för kemivetenskap (CHE), Fiber- och polymerteknik, Polymera material.
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2014 (engelsk)Inngår i: Polymer international, ISSN 0959-8103, E-ISSN 1097-0126, Vol. 63, nr 10, s. 1850-1855Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

A novel emulsion copolymer of vinyl acetate (VAc) and 1-hexene was synthesized at ambient pressure. The feeding technique, initiation system and reaction time of the copolymerization were optimized based on molecular characteristics such as the weight contribution of 1-hexene in the copolymer chains and glass transition temperature (T-g) as well as on bulk properties like minimum film-formation temperature (MFFT) and solid content. According to nuclear magnetic resonance spectroscopy and differential scanning calorimetry results, the combination of starve feeding and redox initiation, within a reaction time of 4h, effectively led to the copolymerization at ambient pressure between highly reactive polar VAc monomers and non-polar 1-hexene monomers of low reactivity. The copolymer showed a lower T-g and MFFT, and a reasonable solid content compared to the poly(vinyl acetate) (PVAc) homopolymer. The consumption rate, hydrolysis of acetate groups and chain transfer reactions during the polymerization were followed using infrared spectroscopy. Based on the results, the undesirable reactions between the VAc blocks were hindered by the neighbouring 1-hexene molecules. Tensile testing revealed an improvement in the toughness and elongation at break of VAc-1-hexene films compared to PVAc films.

sted, utgiver, år, opplag, sider
2014. Vol. 63, nr 10, s. 1850-1855
Emneord [en]
emulsion copolymerization, vinyl acetate, 1-hexene, ambient pressure
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Identifikatorer
URN: urn:nbn:se:kth:diva-153844DOI: 10.1002/pi.4709ISI: 000341810400013Scopus ID: 2-s2.0-84908234866OAI: oai:DiVA.org:kth-153844DiVA, id: diva2:754992
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QC 20141013

Tilgjengelig fra: 2014-10-13 Laget: 2014-10-09 Sist oppdatert: 2017-12-05bibliografisk kontrollert

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