Abstract
A series of poly(isobutylene-alt-maleic anhydride)-g-alkyl alcohol (PIAM-Cn) comb-like polymers were fabricated through the esterification process between poly(isobutylene-alt-maleic anhydride) (PIAM) and n-alkyl alcohol with various side-chain lengths changing from n = 10, 16, 18, 22 to 26. Side-chain crystallization, phase transition, segment conformation, and relaxation behavior of PIAM-Cn comb-like polymers have been in-depth investigated by DSC, variable-temperature X-ray scattering and FTIR, as well as dielectric spectroscopy. For PIAM-Cn comb-like polymers, the phase transition temperature, enthalpy and side-chain crystallization behavior show an obvious dependence upon the side-chain length, and a minimum requirement of carbon atoms to form the side-chain crystallites is 9. The phase transition process from regular orthorhombic packing, irregular hexagonal packing manner to the amorphous state of PIAM-C26 is well confirmed in combination with the other PIAM-Cn (n = 10, 16, 18, 22), showing the varied local packing of and conformational variation of side alkyl chains. Moreover, the chain segment relaxation of PIAM-Cn (n = 10, 18) indicates the restricted local stacking process originated from the cooperation motion of the PIAM backbone and the side chain. A proposed three-phase model is used to describe the chain motion and segment packing manner of comb-like polymers. Also, the phase transition and chain segment relaxation behavior of comb-like polymers are further interpreted from the aspect of side-chain crystallization.
Published Version
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