Abstract
The miscibility of a series of segmented polyurethane (SPU) blends with chlorinated poly(vinyl chloride) (CPVC) was investigated by differential scanning calorimetry (DSC) and Fourier-transform infrared (FTIR) spectroscopy. The segmented polyurethanes based on p, p-diphenylmethane diisocynate (MDI) with 1,4-butanediol (BDO) were synthesized by a two-step, solution polymerization method. DSC results demonstrated that the polyester polyurethane blend with CPVC formed a miscible system, whereas the polyether polyurethane–CPVC blend was an immiscible one. Increasing the molecular weight of the glycol can decrease the miscibility due to the crystallizability of the soft segment. FTIR spectroscopic results showed a strong interaction between CPVC and the polyester soft segment. In addition, it was found that the miscibility of SPU and CPVC decreased upon increasing the hard segment content.
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