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Jianhua Yang,Zhean Xia,Mingjian Cao,Xiangxin Ran 한국고분자학회 2020 폴리머 Vol.44 No.4
Polyethylene oxide (PEO) possesses poor mechanical properties, which limits its application. For the purpose of improving the mechanical properties of water-soluble films, blend of polylactic glycolic acid (PLGA) with PEO was prepared by melt blending. The hydrogen bonding between PEO and PLGA was investigated by Fourier transform infrared spectrometer. The crystallization behavior, water solubility, and mechanical properties were evaluated. The results showed that there was a hydrogen bonding force between PLGA and PEO, and this force can improve the mechanical strength and water absorption of the film. When the PLGA content reached 20 wt%, the tensile strength and the elongation at break achieved a maximum 26.1MPa and 771.2%, respectively. Compared to neat PEO, blend with 10 wt% of PLGA had considerably higher water absorption capacity. When the PLGA content was 40 wt%, the film would not disperse in water.
Minjian Cao,Zhean Xia,Xiangxin Ran,Jinglong Zou 한국고분자학회 2021 폴리머 Vol.45 No.4
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 ε-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 ㎜, and loop tack was 8.45 N/25 ㎜.