Self-complementary multiple hydrogen bonding interactions increase the glass transition temperatures to supramolecular poly(methyl methacrylate) copolymers

摘要

We have prepared a series of poly(methyl methacrylate) (PMMA)-based copolymers through free radical copolymerization of methyl methacrylate in the presence of 2-ureido-4[1H]-pyrimidinone methyl methacrylate (UPyMA). The glass transition temperature was increased with the increase of UPyMA contents in PMMA copolymers due to strong self-complementary multiple hydrogen bonding interactions of UPy moiety. The Fourier transform infrared and solid-state NMR spectroscopic analyses provided positive evidence for the presence of multiple hydrogen bonds interaction of UPy moiety. Furthermore, the proton spin-lattice relaxation time in the rotating frame [T_(1ρ)(H)] for the PMMA copolymers had a single value that was less than pure PMMA, indicating the smaller domain sizes in PMMA copolymers.