This work developed the cationic ring opening polymerization of 3 methyl 3 hydroxymethyleneoxetane initiated by BF 3·OEt 2 directly. The resulted polymer was easily dissolved in polar solvents such as CH 3OH, C 2H 5O...
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This work developed the cationic ring opening polymerization of 3 methyl 3 hydroxymethyleneoxetane initiated by BF 3·OEt 2 directly. The resulted polymer was easily dissolved in polar solvents such as CH 3OH, C 2H 5OH, DMSO and N methyl pyrrolidone, but not dissolved in water, tetrahydrofuran and other non polar solvents. The TGA study of sample 1 indicates that the polymer starts to pyrolyze at 360 ℃. There is a melting endotherm at 125.9 ℃ in the DSC curve of sample 1, and the melting peak enlarged with decreasing the amount of catalyst added, which means that sample 1 is essentially linear, and with increasing the amount of catalyst the resulted polymer becomes slightly branched.
The experimental data obtained from fast heating FTIR spectroscopy have confirmed that a conformational change occurs at about 135 ℃ for semicrystalline iPP. Based on the results of density and WAXD measurements, it ...
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The experimental data obtained from fast heating FTIR spectroscopy have confirmed that a conformational change occurs at about 135 ℃ for semicrystalline iPP. Based on the results of density and WAXD measurements, it can be inferred that the conformational change occurring at 135 ℃ comes from the disordering of helical sequences in non crystalline phase, which is further corroborated by the FTIR study on the chloride polypropylene.
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