Thermal properties of copolymerization products of methyl methacrylate with methacrylamide

Synthesis of PMMA-co-PMAA Copolymer Brush on Multi-Wall Carbon Nanotubes

“…Also a small amount of amorphous carbon after the KMnO 4 oxidation process can be expected [8] although other report shows that oxidation by KMnO 4 in an acidic suspension provides nanotubes free of amorphous carbon [9]. Trace for PMMA-co-PMAAM (line c) clearly shows several decomposition events, similar to [17]. The first one is located at ca.…”

“…Finally, also glass transition temperatures for homopolymers were determined as T g = 105.2˚C ± 0.7˚C for neat PMMA (very similar to usually published value for PMMA [15,16,18]) and T g = 213˚C ± 4˚C for PMAA (available literature data for PMAA significantly vary such as for example 170˚C [16] or 251˚C [15]). Noticed increase in copolymer's T g compared to pure PMMA is usually explained as influence of polar MAA units when strong intermolecular interactions between MAA and MMA units occurs due to the formation of hydrogen bonds [15][16][17].…”

“…A solution radical polymerization of MMA and copolymerization of MMA with MAA were performed in a 40 wt% solution [17] of monomers in MEK (60 ml) at 70˚C for 20 hours using AIBN (0.16 g) as initiator. The molar concentration of MAA in the reaction mixture was 9 mol%.…”

“…One possible way how to prepare PMMA-co-PMAA copolymers is a free radical copolymerization of appropriate monomers in a solvent. As it was shown [15][16][17] the copolymer composition depends on initial monomers MMA:MAA ratio. At a low MMA concentration in monomer mixture the content of monomer units in copolymer is only slightly higher but at higher content of MAA the product is enriched in MAA units rendering isolated PMAA units along copolymer main-chain [15].…”

“…Their improved thermal properties are due to strong hydrogen bonding interactions between this two types of monomer segments [15,16]. These copolymers also pose high degree of homogeneity caused by a good miscibility [16] high transparency or improved adhesion to substrates like silicate glass [17]. Their practical importance is for example in area of optical-electronic industry.…”