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Macrostructural Design of Polylactide-based Materials for Improved Mechanical and Degradation Properties
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Polymer Technology.
2014 (English)Licentiate thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2014. , 52 p.
Series
TRITA-CHE-Report, ISSN 1654-1081 ; 2014:6
National Category
Polymer Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-143542ISBN: 978-91-7595-034-1 (print)OAI: oai:DiVA.org:kth-143542DiVA: diva2:707509
Presentation
2014-04-04, K2, Teknikringen 28, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20140324

Available from: 2014-03-24 Created: 2014-03-24 Last updated: 2014-03-24Bibliographically approved
List of papers
1. Polylactides with "green" plasticizers: Influence of isomer composition
Open this publication in new window or tab >>Polylactides with "green" plasticizers: Influence of isomer composition
2013 (English)In: Journal of Applied Polymer Science, ISSN 0021-8995, E-ISSN 1097-4628, Vol. 130, no 4, 2962-2970 p.Article in journal (Refereed) Published
Abstract [en]

Synthesized polylactides (PLA) with different D-isomer contents in the polymer chain were melt-blended with a series of green plasticizers by extrusion. Mechanical and thermal properties as well as the morphology of the plasticized materials were characterized to demonstrate how the combination of PLA with different D-contents and plasticizer controls the material properties. After addition of acetyl tributyl citrate (ATC), the elongation at break for PLA with a low D-isomer content was twice as high as that for PLAs with high D-isomer contents. Similar variations in the plasticization effect on the PLAs were also observed with the other plasticizers used, glyceryl triacetate (GTA), glycerol trihexanoate (GTH) and polyethylene glycol (PEG). In order to continue with the development of renewable polymers in packaging applications, the interrelation between a plasticizer and a specific polymer needs to be understood.

Keyword
polyesters, stereochemistry and tacticity, plasticizer, extrusion, packaging
National Category
Polymer Technologies
Identifiers
urn:nbn:se:kth:diva-128460 (URN)10.1002/app.39446 (DOI)000323249700085 ()2-s2.0-84883053686 (Scopus ID)
Funder
Swedish Research Council, A0347801EU, European Research Council, 246776
Note

QC 20130912

Available from: 2013-09-12 Created: 2013-09-12 Last updated: 2017-12-06Bibliographically approved
2. Tuning the Degradation Profiles of Poly(L-lactide)-Based Materials through Miscibility
Open this publication in new window or tab >>Tuning the Degradation Profiles of Poly(L-lactide)-Based Materials through Miscibility
2014 (English)In: Biomacromolecules, ISSN 1525-7797, E-ISSN 1526-4602, Vol. 15, no 1, 391-402 p.Article in journal (Refereed) Published
Abstract [en]

The effective use of biodegradable polymers relies on the ability to control the onset of and time needed for degradation. Preferably, the material properties should be retained throughout the intended time frame, and the material should degrade in a rapid and controlled manner afterward. The degradation profiles of polyester materials were controlled through their miscibility. Systems composed of PLLA blended with poly[(R,S)-3-hydroxybutyrate] (a-PHB) and polypropylene adipate (PPA) with various molar masses were prepared through extrusion. Three different systems were used: miscible (PLLA/a-PHB5 and PLLA/a-PHB20), partially miscible (PLLA/PPA5/comp and PLLA/PPA20/comp), and immiscible (PLLA/PPA5 and PLLA/PPA20) blends. These blends and their respective homopolymers were hydrolytically degraded in water at 37 degrees C for up to I year. The blends exhibited entirely different degradation profiles but showed no diversity between the total degradation times of the materials. PLLA presented a two-stage degradation profile with a rapid decrease in molar mass during the early stages of degradation, similar to the profile of PLLA/a-PHB5. PLLA/a-PHB20 presented a single, constant linear degradation profile. PLLA/PPA5 and PLLA/PPA20 showed completely opposing degradation profiles relative to PLLA, exhibiting a slow initial phase and a rapid decrease after a prolonged degradation time. PLLA/PPA5/comp and PLLA/PPA20/comp had degradation profiles between those of the miscible and the immiscible blends. The molar masses of the materials were approximately the same after 1 year of degradation despite their different profiles. The blend composition and topographical images captured at the last degradation time point demonstrate that the blending component was not leached out during the period of study. The hydrolytic stability of degradable polyester materials can be tailored to obtain different and predetermined degradation profiles for future applications.

Keyword
Hydrolytic Degradation, Atactic Poly(3-Hydroxybutyrate), Mechanical-Properties, Enzymatic Degradation, Aliphatic Polyesters, Poly(Dl-Lactic Acid), Poly(Lactic Acid), Phase-Structure, Blends, Polylactide
National Category
Biochemistry and Molecular Biology Polymer Chemistry
Identifiers
urn:nbn:se:kth:diva-141304 (URN)10.1021/bm401667b (DOI)000329879800042 ()2-s2.0-84892601347 (Scopus ID)
Funder
Swedish Research Council, A0347801EU, European Research Council, 246776
Note

QC 20140214

Available from: 2014-02-14 Created: 2014-02-13 Last updated: 2017-12-06Bibliographically approved

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