The T1ρ 13C spin-lattice relaxation time of interpenetrating networks by solid state NMR

摘要: Abstract Poly (2-hydroxyethyl methacrylate) (PHEMA) and poly(2-hydroxyethyl interpenetrated with 5% SiO 2 (PHEMA-IPN) were studied by 13 C CP/MAS NMR. From these results, the structure of two polymers verified Spin-lattice relaxation times for polymer carbons in rotating frame, T 1 ρ , have been measured as a function temperature. The spin-lattice α -quarternary carbonyl PHEMA PHEMA-IPN undergo slow motions, i.e., motions on side minimum, while those 1-,2-, β -methylene, 3-methyl fast minimum. times, we discuss mobility, correlation time, activation energy PHEMA-IPN, respectively. energies found to be generally higher than PHEMA. side-chain 2-methylene is attributed bonding between hydroxyl group