Side-chain crystallization and segment packing of poly(isobutylene-alt-maleic anhydride)-g-alkyl alcohol comb-like polymers

Side‐chain crystallization and phase transition of poly[styrene‐co‐(maleic anhydride)]‐g‐alkylamine comb‐like polymers

“…The unique phase structure and side-chain crystallization behavior depend on the side-chain length, polymer backbone, the chemical spacers between main chains and side chains and the layered nanostructure. [4][5][6][7][8] Information on the packing structure, conformational variation and crystallization habit has been reported previously, [9][10][11][12][13][14][15][16][17][18] and the length of pendent side chains, the critical crystallizable carbon atoms and the rigidity of the backbone show an important contribution. The exhibited side-chain crystalline packing of comb-like polymers that originates from crystallizable alkyl side chains illustrates the main difference from linear polymers and main-chain crystallization polymers, [17][18][19] and the hexagonal phase (⊍ H ) is a typical one, which is strongly regulated by the crystallizable carbon atoms and the polymer backbones.…”

“…Recently, a series of double-component comb-like polymers have been reported by our group with poly[ethylene-graft-(maleic anhydride)] (EMA), poly[styrene-co-(maleic anhydride)] (SMA), poly[(methyl vinyl ether)-alt-(maleic anhydride)] (PVEM), poly[acrylonitrile-co-(alkyl acrylate)] and poly [isobutylene-alt-(maleic anhydride)] (PIAM) as polymer main chain. 9,11,21,35,36 Interestingly, these double-component comblike polymers such as EMA-Cn, PVEM-Cn, PIAM-Cn and SMA-g-CnOH exhibit a chain packing manner different from that of the single-component ones. Also, PVEM-Cn and PIAM-Cn comb-like polymers required at least nine CH 2 units to satisfy the critical crystallization requirement for the pendent alkyl side chains.…”

“…Also, PVEM-Cn and PIAM-Cn comb-like polymers required at least nine CH 2 units to satisfy the critical crystallization requirement for the pendent alkyl side chains. 9,11 Meanwhile, the rigid SMA backbone decreases the crystallizable carbon atoms in the alkyl side chains, and then the phase change enthalpy is inferior to that of the flexible EMA-Cn, PVEM-Cn and PIAM-Cn. This further indicates that the crystallization habits of comb-like polymers depend on the polymer rigidity, the backbone component and the side-chain length.…”

Construction of lamellar morphology by side‐chain crystalline comb‐like polymers for gas barrier

“…The normalized enthalpy values of P(S-AA) n -g(p) were significantly smaller than the corresponding alkylamine, suggesting that only a portion of the alkylene segments was involved into crystalline lattice. 29,[41][42][43][44] Moreover, the melting points of P(S-AA) n -g(p) are slightly higher than those of pure alkylamine, which is probably caused by the existence of hydrogen bond generated by the reaction between amines and carboxylic acids. 45 Furthermore, it could be concluded that the higher degree of crystallinity could be achieved when P(S-AA) n -g(p) had the longer side chains or the higher grafting density.…”

Preparation of antistatic epoxy resin coatings based on double comb-like quaternary ammonium salt polymers

“…28 The structure of comb-like polymer, especially the varied packing manners of side chains, contributes the varied crystallization behavior. 29 The incorporating of side chains into the polymer main chain can suppress the crystallinity and enhance the solubility. 30 In this study, the double comb-like quaternary ammonium salt polymers with the main chain containing quaternary ammonium salt groups are designed and synthesized, which have the advantages of good solubility in epoxy resin paints by increasing the branch length to reduce the polarity and crystallinity because of forming a double comb-shaped polymer structure.…”