School of Material Science and Engineering, East China University of Science and Technology, Shanghai 200237, China
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Random copolymers of poly(lactic acid-co-glycolic acid-co-ε-caprolactone) (PLGA-CL) based on lactic acid (LA), glycolic acid (GA), citric acid (CA), and e-caprolactone (CL) were synthesized and characterized. 1H NMR spectra showed that the polymerization conversion of various monomers was high under the experimental conditions, and the degree of polymerization of the polycaprolactone (PCL) segment increased with the growth of CL content. The content of CL has a remarkable effect on the decrease of glass transition temperature (Tg) of the copolymers. The adhesive properties of random copolymers as pressure-sensitive adhesive (PSA) were evaluated. With the increase of CL content, 180° peel strength, the shear strength and loop tack decreased. When CL content was 16.7 wt%, 180° peel strength was 4.76 N/25 mm, and loop tack was 8.45 N/25 mm.
Keywords: poly(lactic acid-co-glycolic acid), ε-caprolactone, glass transition temperature, pressure-sensitive adhesive property.
2021; 45(4): 592-600
Published online Jul 25, 2021
School of Material Science and Engineering, East China University of Science and Technology, Shanghai 200237, China