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Homocomposites of Polylactide (PLA) with Induced Interfacial Stereocomplex Crystallites
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Polymer Technology.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Polymer Technology.ORCID iD: 0000-0002-5850-8873
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Fibre Technology.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Fibre Technology.
2015 (English)In: ACS Sustainable Chemistry & Engineering, ISSN 2168-0485, Vol. 3, no 9, 2220-2231 p.Article in journal (Refereed) Published
Abstract [en]

The demand for “green” degradable composite materials increases with growing environmental awareness. The key challenge is achieving the preferred physical properties and maintaining their eco-attributes in terms of the degradability of the matrix and the filler. Herein, we have designed a series of “green” homocomposites materials based purely on polylactide (PLA) polymers with different structures. Film-extruded homocomposites were prepared by melt-blending PLA matrixes (which had different degrees of crystallinity) with PLLA and PLA stereocomplex (SC) particles. The PLLA and SC particles were spherical and with 300–500 nm size. Interfacial crystalline structures in the form of stereocomplexes were obtained for certain particulate-homocomposite formulations. These SC crystallites were found at the particle/matrix interface when adding PLLA particles to a PLA matrix with d-lactide units, as confirmed by XRD and DSC data analyses. For all homocomposites, the PLLA and SC particles acted as nucleating agents and enhanced the crystallization of the PLA matrixes. The SC particles were more rigid and had a higher Young’s modulus compared with the PLLA particles. The mechanical properties of the homocomposites varied with particle size, rigidity, and the interfacial adhesion between the particles and the matrix. An improved tensile strength in the homocomposites was achieved from the interfacial stereocomplex formation. Hereafter, homocomposites with tunable crystalline arrangements and subsequently physical properties, are promising alternatives in strive for eco-composites and by this, creating materials that are completely degradable and sustainable.

Place, publisher, year, edition, pages
2015. Vol. 3, no 9, 2220-2231 p.
National Category
Polymer Technologies
Identifiers
URN: urn:nbn:se:kth:diva-173245DOI: 10.1021/acssuschemeng.5b00498OAI: oai:DiVA.org:kth-173245DiVA: diva2:852258
Note

QC 20150910

Available from: 2015-09-08 Created: 2015-09-08 Last updated: 2017-01-11Bibliographically approved
In thesis
1. Towards a retro-structural design of degradable aliphatic polyester-based materials
Open this publication in new window or tab >>Towards a retro-structural design of degradable aliphatic polyester-based materials
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The increasing amount of accumulated plastic waste has led to a continuous search for degradable materials for use in a variety of applications. This eco-friendly approach contemplates the use of degradable alternatives to the inert polymers (the main components in plastics) used today and further engineering of their degradation pathways. The most extensively investigated group of degradable polymers is the poly(α-esters), due to their tailorable thermo-mechanical properties and degradability. However, degradation of these polymers can be undesirable or desirable depending on the time of occurrence. Thus, by controlling the degradation process, it is possible to predict and, consequently, tailor the materials’ lifetime for specific needs.Herein, a methodology to allow for a retro-structural design of degradable materials based on aliphatic polyesters is presented. Insights into the degradation behavior of the systems were obtained and further translated to different levels of structural designs to achieve desired macroscopic properties in terms of performance and degradability. Several combinational strategies based on polymer morphology, polymer structure and block design, were developed. As a result, homopolymers and block copolymers with projected degradation for different instances were created. Apart from bulk modifications in the material, it was shown that it was possible to tailor degradation pathways by means of specific interactions between polymer pairs in block copolymers and also in polymer blends. Furthermore, well-defined structure-property relationships are crucial when designing materials with specific degradability properties. In light of this, degradable polyester-based particles with tunable crystalline structures and, hence, physical properties, were developed. These particles proved to function as reinforcing agents in the creation of “green” homocomposites. These composites are promising alternatives in the search for materials that are completely degradable and sustainable.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2015. 95 p.
Series
TRITA-CHE-Report, ISSN 1654-1081 ; 2015:62
Keyword
Hydrolysis, polyesters, polylactide, hydrophobicity, crystallinity, miscibility, nanoparticles, stereocomplex, homocomposites
National Category
Polymer Chemistry
Research subject
Chemistry
Identifiers
urn:nbn:se:kth:diva-177187 (URN)978-91-7595-748-7 (ISBN)
Public defence
2015-12-11, Kollegiesalen, Brinellvägen 2, KTH, Stockholm, 13:30 (English)
Opponent
Supervisors
Note

QC 20151117

Available from: 2015-11-17 Created: 2015-11-17 Last updated: 2015-11-17Bibliographically approved

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