Summary
New polyamides and polyesters containing spiroacetal and silphenylene units were prepared by the low-temperature interfacial polycondensation reaction of 4,4′-diaminodibenzalpentaerythritol (4-ABP) or 4,4′-dihydroxydibenzalpentaerythritol (4-HBP) with bis(4-chlorocarbonylphenyl)dimethylsilane (DMS) or bis(4-chlorocarbonylphenyl)diphenylsilane(DPS). The resulting polymers have inherent viscosities in the range of 0.13∼0.90 dL/g at 30°C in N,N-dimethylacetamide. These polymers were readily soluble in various polar solvents and were able to be cast into transparent and tough films. The glass transition temperatures of the polymers were detected in the range of 161∼253°C in their differential scanning calorimetry traces. No evidence of melting point was observed in all polymers. The solution-casted film of polyamide (PA-I) derived from 4-ABP and DMS showed ultimate strength of 73.4 MPa and initial modulus of 13.4 GPa.
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Kim, KS., Lee, SM., Ryu, KC. et al. Synthesis and properties of aromatic polyamides and polyesters containing spiroacetal and silphenylene units. Polymer Bulletin 35, 57–63 (1995). https://doi.org/10.1007/BF00312894
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DOI: https://doi.org/10.1007/BF00312894