Synthesis and characterization of polypropylene-graft-poly(l-lactide) copolymers by CuAAC click chemistry
Journal of Polymer Science, Part A: Polymer Chemistry, vol.56, no.22, pp.2595-2601, 2018 (SCI-Expanded, Scopus)
- Publication Type: Article / Article
- Volume: 56 Issue: 22
- Publication Date: 2018
- Doi Number: 10.1002/pola.29241
- Journal Name: Journal of Polymer Science, Part A: Polymer Chemistry
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Page Numbers: pp.2595-2601
- Keywords: biodegradable, block copolymers, poly(propylene) (PP)
- Trakya University Affiliated: No
Abstract
The syntheses of polypropylene-graft-poly(l-lactide) copolymers (PP-g-PLAs) via copper (I)-catalyzed azide-alkyne cycloaddition “click” reaction (CuAAC) using azide side-chain functionalized polypropylene (PP-N3) and alkyne end-functionalized poly(l-lactide) (PLA-Alkyne) were reported. The CuAAC was then applied to azide and different feeding ratios of alkyne functional polymers to give PP-g-PLAs that were characterized by FTIR, 1H-NMR, GPC, DSC, and WCA measurements. The CuAAC click reaction was achieved by two different feeding ratio (PP-N3:PLA-Alkyne = 1:5 and 1:10) and thermal, biodegradable, and surface properties of obtained graft copolymers were investigated. The molar ratio of PLA were calculated as 72.7 (PP-g-PLA-1) and 78.4% (PP-g-PLA-2) by 1H-NMR spectroscopy. The water contact angle (WCA) values of PP-g-PLA-1 (81o ± 1.3) and PP-g-PLA-2 (75o ± 1.6) copolymers were compared with commercial chlorinated polypropylene (PP-Cl) (90o ± 1.0), suggesting a more hydrophilic nature of desired graft copolymers produced. Conversely, the enzymatic biodegradation studies revealed that the weight losses of graft copolymers were determined as 13.6 and 22.1%, which is about 4% for commercial PP-Cl sample. Thus, it was clear that this simple and facile method was effective in promoting biodegradation of commercial polypropylene and attractive particularly for worldwide environmental remediation goals. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2018, 56, 2595–2601.