Mechanical Properties of the Dried and Swollen Gels Obtained from Poly (Ethylene Glycol Allenyl Methyl Ether)

抄録

The mechanical properties of gels obtained by the cationic crosslinking of poly (ethylene glycol allenyl methyl ether) were examined both in the dried and swollen states. Relatively high elastic properties were observed in the dried state. The storage modulus (E′) and loss modulus (E″) were evaluated as a function of the cationic crosslinking conditions. In most cases, E″was much smaller than E'. The number of elastically effective crosslinking points (n_e) and the molecular weight between two crosslinking points (M_c) were estimated from the storage modulus (E′) in a linear viscoelastic region. The maximum value of ne and the minimum value of M_c was observed for the dried gel produced by the reaction in CH₂Cl₂ (20wt%) with 1.2mol% of BF₃·OEt₂. Thus, the effectiveness of the crosslinker was found to be dependent upon the cationic crosslinking conditions.