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Miscibility and surface segregation in PVC/polyester blends: the influence of chain architecture and composition
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.ORCID iD: 0000-0002-7790-8987
2007 (English)In: Journal of Polymer Science Part B: Polymer Physics, ISSN 0887-6266, E-ISSN 1099-0488, Vol. 45, no 13, 1552-1563 p.Article in journal (Refereed) Published
Abstract [en]

Four poly(butylene adipate) (PBA) polyesters, the structure ranging from linear to highly branched, were synthesized and solution casted with poly(vinyl chloride) (PVC) in 20 or 40 wt % concentrations to evaluate the influence of polyester chain architecture on miscibility, surface segregation, and mechanical properties. The miscibility of PVC and polyesters is based on specific interactions between the carbonyl group in the polyester and PVC. These interactions cause a shift in the carbonyl absorption band in the FTIR spectra. The shifting of the carbonyl absorption band was more significant for all the 40 wt % blends compared with the blends containing 20 wt % of the same polyester. In the 20 wt % blends surface segregation and enrichment of polyester at the blend surface increased as a function of branching. However, all the films containing 40 wt % of polyester had similar surface composition. This is explained by better miscibility and stronger intermolecular interactions in the 40 wt % blends, which counteract the effect of branching on the surface segregation. High degree of branching resulted in poor miscibility with PVC and poor mechanical properties. A linear or slightly branched polyester structure, however, resulted in good miscibility and desirable blend properties.

Place, publisher, year, edition, pages
2007. Vol. 45, no 13, 1552-1563 p.
Keyword [en]
Blends; Branched; Miscibility; Poly(vinyl chloride); Polyesters; Fourier transform infrared spectroscopy; Molecular interactions; Polyesters; Polyvinyl chlorides; Solubility; Surface segregation; Branched polyester structure; Polybutylene adipate (PBA) polyesters; Polyester chains; Polyester enrichment
National Category
Polymer Chemistry Polymer Technologies
Identifiers
URN: urn:nbn:se:kth:diva-6758DOI: 10.1002/polb.21149ISI: 000247282100006Scopus ID: 2-s2.0-34547281828OAI: oai:DiVA.org:kth-6758DiVA: diva2:11559
Note

QC 20100805

Available from: 2007-02-14 Created: 2007-02-14 Last updated: 2017-12-14Bibliographically approved
In thesis
1. Environmentally Friendly Plasticizers for PVC: Improved Material Properties and Long-term Performance Through Plasticizer Design
Open this publication in new window or tab >>Environmentally Friendly Plasticizers for PVC: Improved Material Properties and Long-term Performance Through Plasticizer Design
2007 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

Linear and branched poly(butylene adipate) polyesters with number-average molecular weights ranging from 700 to 10 000 g/mol, and degrees of branching ranging from very low to hyperbranched were solution cast with PVC to study the effects of chemical structure, molecular weight, end-group functionality, and chain architecture on plasticizing efficiency and durability. Miscibility was evaluated by the existence of a single glass transition temperature and a shift of the carbonyl group absorption band. Desirable mechanical properties were achieved in flexible PVC films containing 40 weight-% of polyester plasticizer. Methyl-ester-terminated polyesters with a low degree of branching and an intermediate molecular weight enhanced the plasticizing efficiency, as shown by greater elongation, good miscibility, and reduced surface segregation. A solid-phase extraction method was developed to extract the low molecular weight products that migrated from pure poly(butylene adipate) and PVC/ poly(butylene adipate) films during aging in water. The effects of branching, molecular weight, end-group functionality, and polydispersity on plasticizer permanence were evaluated by quantification of low molecular weight hydrolysis products, weight loss, surface segregation, and the preservation of material properties during aging. A more migration-resistant polymeric plasticizer was obtained by combining a low degree of branching, hydrolysis-protecting end-groups, and higher molecular weight of the polyester. Films plasticized with a slightly branched polyester showed the best durability and preservation of material and mechanical properties during aging. A high degree of branching resulted in partial miscibility with PVC, poor mechanical properties, and low migration resistance. The thermal stability of polyester-plasticized films was higher than that of films containing a low molecular weight plasticizer, and the stabilizing effect increased with increasing plasticizer concentration.

Place, publisher, year, edition, pages
Stockholm: KTH, 2007. 66 p.
Series
Trita-FPT-Report, ISSN 1652-2443 ; 2006:45
Keyword
poly(butylene adipate), poly(vinyl chloride), plasticizers, miscibility, mechanical properties, surface segregation, migration, degradation products
National Category
Polymer Chemistry
Identifiers
urn:nbn:se:kth:diva-4272 (URN)978-91-7178-557-2 (ISBN)
Public defence
2007-02-16, Sal F3, KTH, Lindstedtsvägen 26, Stockholm, 10:00
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Note
QC 20100805Available from: 2007-02-14 Created: 2007-02-14 Last updated: 2010-08-05Bibliographically approved

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