Synthesis and hydrophilicity of poly(trimethylene 2,6-naphthalate)/poly(ethylene glycol) copolymers

Abstract

Poly(trimethylene 2,6-naphthalate) (PTN)/poly(ethylene glycol) (PEG) copolymers were synthesized by the twostep melt copolymerization process of dimethyl-2,6-naphthalenedicarboxylate (2,6-NDC) with 1,3-propanediol (PD) and PEG. The copolymers produced had different PEG molecular weights and contents. The structure, thermal property, and hydrophilicity of these copolymers were studied by proton nuclear magnetic resonance ( 1 H-NMR) analysis, differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and by contact angle, moisture content, and instantaneous elastic recovery measurements. The intrinsic viscosity and the instantaneous elastic recovery of the PTN/PEG copolymers increased with increasing PEG molecular weight and content, whereas the glass transition, melting, and cold crystallization temperatures, and the heat of fusion of the PTN/PEG copolymers all decreased with increasing PEG molecular weight or content. The thermal stability of the copolymers was not affected by PEG molecular weight or content. The hydrophilicity, as determined by contact angle and moisture content measurements of the copolymer films, was significantly improved with increasing PEG molecular weight and content.

Hierarchical self-assembly of miktoarm star copolymers with pathway complexity

“…It is well known that the surfaces grafted with PS are typically hydrophobic, 55 whereas PEG-coated surfaces are relatively hydrophilic. 56,57 To further confirm the surface composition of the bundled nanofibers, the casting film of SEW-2 obtained from the THF/methanol mixture was further characterized by water wetting. The resulting static contact angle of water was determined to be 125°, indicative of a highly hydrophobic Fig.…”

“…By contrast, this smaller value (70°) was in the range of water contact angles on the thin films that were grafted with PEG chains (35-75°). 56,57 These collective data indicated that the regular vesicles were comprised of PS 57 cores and [α-SiW 12 O 40 ] 4− /PEG 45 coronas (Fig. 5).…”

Preparation of waterborne elastic polyesters by chain extension with isophorone diisocyanate as a chain extender

“…The instantaneous elastic recovery (IER, %) of samples after the first and the fifth stretch‐recovery cycle was calculated with eq. , and the results were reported as averaged values of five tests of each sample where L 0 is the original length of the film tested and Δ L is the increase of the film length after the first or the fifth stretch‐recovery cycles.…”