BUTATRIENE-BASED POLYMER CHEMISTRY .2. SYNTHESIS AND CHARACTERIZATION OF POLY[1,1,4,4-BIS(PENTAMETHYLENE)-1,2,3-BUTATRIENE]

摘要

The cumulene 1,1,4,4-bis(pentamethylene)butatriene has been shown to undergo a thermally induced 1,4 free-radical polymerization to yield a crystalline polymer with a unique nonconjugated acetylene containing backbone. This polymerization occurs in both the melt and in solution. Typical free-radical inhibitors prevent the thermally induced polymerization. The reaction occurs in the presence or absence of free-radical initiators. The polymer is crystalline with a triclinic unit cell (a = 9.87 Angstrom, b = 6.10 Angstrom, c = 4.97 Angstrom, alpha = 113.7 degrees, beta = 85.2 degrees, gamma = 100.6 degrees). No melting or glass transition is observed via differential calorimetry, but an irreversible exothermic transition is observed from both solution and melt polymerized material. This is interpreted as a cold crystallization process. Trapping of the polymerizing monomer with TEMPO leads to soluble oligomers. [References: 24]