New comb-like poly(n-alkyl itaconate)s with crystalizable side chains

The effect of NOM to TiO2: interactions and photocatalytic behavior

“…Moreover, LHA2 spectrum revealed that the main peak was at 33 ppm, while this was shifted to 30 ppm in the adsorbed material (LT400). This change reveals methylene units in fast equilibrium between trans and glance conformations, characteristic of molten states [35]. This agrees with the findings by Chen et al who observed that when humics interact with TiO 2 their conformation changes and TiO 2 mainly adsorbs the phenolic moieties of humic acid [6].…”

Effect of alkyl side chain substitution on molecular structure of comb-like poly(2-hydroxyethyl methacrylate) derivatives

“…This type of interdigitated structure is created through hexagonal packing, which is a typical structure in confined alkyl chains. [19][20][21] Alternatively, the lower population (37%) of alkyl side chains in the copolymer of PC-37 leads to tilting of the side chains, which generates the interdigitated packing structure between nearby alkyl side chains. The tilting of the side chains results in the decrease in d-spacing observed in the 2-D GIWAXD experiments, where PC-37 (34.3 Å) shows smaller d-spacing compared to PC-92 (40.1 Å), despite the fact that they are the same copolymers with different compositions.…”

Comb-like copolymers of n-alkyl monoitaconates and styrene

“…Following the procedure previously reported [6,8], mono-n-alkyl-itaconates (MI-n) were obtained by esterification of itaconic acid with the corresponding alcohol (1:3 mol/mol) using acetyl chloride as catalyst. Monomer structure is shown in Scheme 1.…”

“…It is well known that n-alkyl side chains in comb like polymers are able to crystallize when they reach a minimum length [20,21]. In the case of poly(n-alkyl itaconate)s, it was found that poly(n-dialkyl itaconate)s with 12 or more carbon atoms in n-alkyl side chains are able to crystallize [4,8], but for poly(mono n-alkyl itaconate)s and poly(methyl n-alkyl itaconate)s 14 or more carbon atoms in the side chain are necessary [8]. The endothermic transitions ascribed to the melting of crystallized alkyl side chains were observed only for copolymers with MI-16, MI-18 or MI-22 and low concentrations of St (St molar fraction ≤ 0.50).…”