Biocompatible propylene glycol alginate-g-polytetrahydrofuran amphiphilic graft copolymers for highly effective drug carriers

Polymer PU–PTHF–PU Significantly Enhances the Mechanical Properties of Poly(lactic acid) Matrix Oil–Water Separation Fiber Membranes

“…The peaks observed at three locations (f–d) are attributed to methyl (CH 3 , 2.42 ppm) and the benzene ring (7.30 ppm, 7.73 ppm) within the TSI fragment, respectively . Whereas PTHF exists as a flexible chain segment, the peaks at g and h denote the methylene group in the chain (CH 2 , 1.62 ppm) as well as the methylene group close to the oxygen (CH 2 , 3.44 ppm), respectively. , In addition, analysis by 13 C NMR (Figure S1) showed that, as the ring-opening copolymerization reaction between TSI and ECH proceeded, the signals at 62.74 ppm (the carbon atom that can be attributed to the terminal methylene group in PTHF) disappeared in the PU–PTHF–PU polymer, suggesting that all of PTHF was successfully linked to the PU chain segments. FTIR analysis further corroborated the polymer’s structural integrity, as illustrated in Figure B.…”

“…Moreover, the pronounced absorption peak at 1745 cm –1 denotes the carbonyl group’s location, while the absorption peaks at 1597 and 1365 cm –1 validate the incorporation of the p -toluenesulfonyl group within the polymer. The absorption peaks at 1281 and 1172 cm –1 indicate the stretching vibrations between C–N and C–O in the PU segment, respectively. , Concurrently, the evident absorption peak at 1119 cm –1 indicates the presence of a C–O–C bond in the PTHF segment …”