Abstract
The compatibility of chlorinated polyethylene containing 48 and 25 wt% Cl (CPE 48 and CPE 25) with a poly(ether ester) block copolymer (PEES) was studied over the complete composition range. The compatibility of CPE 48 with poly(butylene terephthalate) (PBT) at the 50 50 composition was also studied. The techniques used were dynamic mechanical analysis (d.m.a.), differential scanning calorimetry (d.s.c.) and tensile testing. Fire retardancy tests were also performed on PEES/CPE 48 blends. The results indicated miscibility of PEES/CPE 48 at all compositions and allowed the determination of the LCST. CPE 25 was partially miscible while the crystalline component of PBT was immiscible with CPE 48. Thus, miscibility can be traced to amorphous polyether and polyester groups interacting with proton-donating CPE. Tensile properties of PEES/CPE 48 blends are good and constant beyond the 25 wt% CPE level. These blends are self extinguishing at high CPE levels. Miscibility of blends was rationalized using the copolymer-copolymer miscibility theory in combination with solubility theory.
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