Copolyesters Containing Polyisobutylene Soft Segments and Polybutylene Terephthalate as the Crystalline Segments |
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| Authors: | G Deák J P Kennedy |
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| Institution: | 1. Institute of Polymer Science The University of Akron , Akron , OH , 44325-3909 , USA;2. Institute of Applied Chemistry, Kossuth Lajos University , 4010 , Debrecen , Hungary;3. Institute of Polymer Science The University of Akron , Akron , OH , 44325-3909 , USA |
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| Abstract: | Abstract The preparation and characterization of multiblock copolymers consisting of polyiso-butylene (PIB) soft segments connected to dimethyl terephthalate (DMT) plus 1,4-butane diol (BD) hard segments (PIB-b-PBT)n are described. Syntheses involved solution poly-condensation of DMT + BD + hydroxyl ditelechelic PIB (HO-PIB-OH). The overall block composition, and the lengths of the soft segments were varied in the Mn,PIB=1,400–10,000 g/mol range. The presence of PIB in the multiblocks was demonstrated. The solubility in THF and other solvents, and extractability of the polymers with n-hexane were studied. Efforts to determine solution viscosity remained unsuccessful due to the insolubility of the polar and nonpolar segments in a common solvent. Mechanical testing gave unacceptable results, however, the multiblocks showed good thermal stability (up to 367°C in air) and melt processibility appears to be feasible. |
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