Evaluation of the diethylene glycol bis(allyl carbonate)/acrylic acid copolymer behavior by solid‐state ¹³C‐NMR

Abstract

ABSTRACT:The dynamic behavior of diethylene glycol bis(allyl carbonate) (CR-39)/acrylic acid (AA) copolymers was evaluated by 13 C high-resolution solid-state nuclear magnetic resonance (NMR). The NMR data showed that the copolymerization of CR-39 and AA generated copolymers with different molecular behaviors as a function of AA content, which promoted changes in the crosslinking of CR-39 chains and in the intramolecular forces. The copolymerization process influenced the sequence distribution and domain formation of the monomers, which is a consequence of the dispersion of comonomers along the macromolecular chains.

Effect of the coupling agent on the properties of poly(acrylic acid)−Al2O3 interpenetrating hybrids and sorption of metal ions

“…We used an AA/APS mole ratio of 10 and an excess of initiator, and the low solubility in 2‐butanol provides excellent conditions for reactivating the polymerization reaction during the sol‐gel treatment . The polymer backbone shows CH − and CH 2 − at 43 and 28 ppm, typical chemical shifts for PAA . PAA/Al 2 O 3 ‐TMPM( x ) with x = 0.125 − 0.50 showed new signals at 68 and 9.0 ppm.…”

Fabrication of very high aspect micromold by SU-8 photolithography and electroforming

“…Four additional peaks appeared at 179.1 ppm (peak L), 63.5 ppm (peak M), 27.7 ppm (peak N) and 21.8 ppm (peak P) in the spectrum of Sample A2. The peak at 179.1 ppm (peak L) was attributed to carbon in carbonyl (C=O) group[258,[261][262][263][264], peak M at 63.5 ppm was assigned to carbon atom in ether bond[258,263]. The 13 C…”