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UV-assisted synthesis of poly(L-lactide-co-glycidyl methacrylate-graft-acrylamide) for use in biomedical and environmental applications
Abstract
Amphiphilic surface-grafted poly(L-lactide-co-glycidyl methacrylate-graft-acrylamide-co-N,N’-methylenebisacrylamide) copolymer, P(LLA-co-GMA-g-AAm-co-MBAm) has been synthesized by a UV photopolymerization process. The grafted copolymer particles possess a combination of unique properties of biodegradable PLLA, PGMA, and PAAm polymers. The success of the grafting process was verified by FTIR and 1H NMR spectroscopy. FTIR results confirm the presence of P(AAm-co-MBAm) chains as grafted chains. Two characteristics 1H NMR signals of polyacrylamide appear at 2.0-2.1 and 1.5-1.6 ppm (overlap with PLLA methine proton) in the grafted copolymer, further ensuring the existence of polyacrylamide. Along with qualitative data, 1H NMR results also show that 0.8 mole % of acrylamide had been grafted, for which 58% of GMA double bonds had reacted. The grafted copolymers have high potential for use in various applications, especially in biomedical and environmental fields.
... In contrast, a new signal due to methine (-CH-CH2) of PAAm appears at 2.0-2.1 ppm in the spectra of the grafted copolymers [Inset of Figure 6]. However, the expected methylene (-CH-CH2) signal overlaps with that of the methylene of PLA at 1.5-1.6 ppm [55][56][57]. Nonetheless, these firmly show the success of the grafting reaction and the presence of AAm chains on the surface of copolymer particles. 1 H NMR spectra of Cop, cCop and their corresponding grafted products are compared in Band areas of the amide I and amide II modes are calculated by a curve fitting program, as summarized in Table 2. ...
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