Journal
MOLECULES
Volume 25, Issue 23, Pages -Publisher
MDPI
DOI: 10.3390/molecules25235740
Keywords
block copolymers; renewable resources; RAFT; alkyl lactate; PSA
Funding
- Spanish Ministerio de Ciencia, Innovacion y Universidades [MAT2017-82669-R]
- Serra Hunter Programme of the Government of Catalonia
- Miguel Servet Program from Instituto de Salud Carlos III [CPII13/00017]
- Fondo de Investigaciones Sanitarias from Instituto de Salud Carlos III
- European Union (ERDF/ESF, `Investing in your future') [PI18/00349]
- Diputacion General de Aragon [B25_20R]
- Centro de Investigacion Biomedica en Red en Enfermedades Hepaticas y Digestivas (CIBERehd)
- European Regional Development Fund [MOBTT21]
- Estonia-Russia Cross Border Cooperation Programme [ER30]
- Baltic Research Programme in Estonia (EEA) [EMP426]
- University Rovira i Virgili [DL003536]
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Lactic acid is one of the key biobased chemical building blocks, given its readily availability from sugars through fermentation and facile conversion into a range of important chemical intermediates and polymers. Herein, well-defined rubbery polymers derived from butyl lactate solvent were successfully prepared by reversible addition-fragmentation chain transfer (RAFT) polymerization of the corresponding monomeric acrylic derivative. Good control over molecular weight and molecular weight distribution was achieved in bulk using either monofunctional or bifunctional trithiocarbonate-type chain transfer agents. Subsequently, poly(butyl lactate acrylate), with a relative low T-g (-20 degrees C), good thermal stability (5% wt. loss at 340 degrees C) and low toxicity was evaluated as a sustainable middle block in all-acrylic ABA copolymers using isosorbide and vanillin-derived glassy polyacrylates as representative end blocks. Thermal, morphological and mechanical properties of copolymers containing hard segment contents of <20 wt% were evaluated to demonstrate the suitability of rubbery poly(alkyl lactate) building blocks for developing functional sustainable materials. Noteworthy, 180 degrees peel adhesion measurements showed that the synthesized biosourced all-acrylic ABA copolymers possess competitive performance when compared with commercial pressure-sensitive tapes.
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