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Designed chain architecture for enhanced migration resistance and property preservation in poly(vinyl chloride)/polyester blends
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: Biomacromolecules, ISSN 1525-7797, E-ISSN 1526-4602, Vol. 8, no 4, 1187-1194 p.Article in journal (Refereed) Published
Abstract [en]

Blends of poly(vinyl chloride) (PVC) and poly(butylene adipate) (PBA) with varying degrees of branching were analyzed with respect to migration resistance during aging in water, preservation of material properties, and thermal stability. Gas chromatography-mass spectrometry, water absorption, weight loss, thermogravimetric analysis, Fourier transform infrared spectroscopy, contact angle, tensile testing, and differential scanning calorimetry were used to analyze the blends before and after aging in water for 6 weeks. Films plasticized with slightly branched polyester maintained their material and mechanical properties best during aging. High degree of branching was accompanied by poor miscibility, increased hydrophilicity, and polydispersity, and highly branched PBA was not favorable as a plasticizer. Strong intermolecular interactions reduced the water absorption and increased the migration resistance of the blends. Polymeric plasticizers with no, low, or moderate degree of branching improved the thermal stability of films compared to films plasticized with a traditional phthalate plasticizer. Proper design of plasticizer architecture led, thus, to improved migration resistance, long-term properties, and thermal stability in PVC/polyester blends.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2007. Vol. 8, no 4, 1187-1194 p.
Keyword [en]
Absorption; Contact angle; Differential scanning calorimetry; Fourier transform infrared spectroscopy; Gas chromatography; Mass spectrometry; Polybutenes; Polyesters; Polymer blends; Tensile testing; Thermodynamic stability; Enhanced migration resistance; Intermolecular interactions; Polybutylene adipate; Polyvinyl chlorides; phthalic acid; plasticizer; polyester; polyvinylchloride; water; article; differential scanning calorimetry; film; gas chromatography; hydrophilicity; infrared spectroscopy; mass spectrometry; preservation; priority journal; tensile strength; thermogravimetry; thermostability; water absorption; Butylene Glycols; Membranes, Artificial; Plasticizers; Polymers; Polyvinyl Chloride; Surface Properties; Temperature; Water
National Category
Polymer Chemistry Polymer Technologies
Identifiers
URN: urn:nbn:se:kth:diva-6759DOI: 10.1021/bm070001kISI: 000245510100019PubMedID: 17343406Scopus ID: 2-s2.0-34247617673OAI: oai:DiVA.org:kth-6759DiVA: diva2:11560
Note

QC 20100805. Uppdaterad från Manuskript till Artikel i tidskrift 20100805. QC 20160212

Available from: 2007-02-14 Created: 2007-02-14 Last updated: 2016-02-12Bibliographically 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
Opponent
Supervisors
Note
QC 20100805Available from: 2007-02-14 Created: 2007-02-14 Last updated: 2010-08-05Bibliographically approved

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