The miscibility o f polycarbonates derived from Bisphenol A o r 2,5,2',5'-tetramethyl-Bisphenol A with poly(viny1 chloride), chlorinated poly(viny1 chloride), and vinyl chloride-vinylidene chloride copolymers has been investigated. In miscible blends a shift o f the position o f the carbonyl absorption in the IR spectra indicates dipolar interactions between the polymers. The miscibility o f chlorinated polyethylenes and reduced poly(viny1 ch1oride)s among each others demonstrates besides the importance o f polar groups the influence o f their distribution within the polymer chains for the compatibility o f the polymers. The investigations on the miscibility have been carried out by differential scanning calorimetry, and by casting films with microscopical observation o f the resulting structures.
The compatibility of chlorinated hydrocarbon polymers + q h X C 4 )-of two different comonomer sequence orders was investigated. One series of copolymers ("PVG") was prepared via reduction of polyvinylchloride, the other ("PEG") via chlorination of polyethylene in solution. The blends PEG/PEC,,, PVCJPVC, and PVCJPEC,, were analyzed with a film casting method at 30°C and 110OC. Miscibility increases in the system PECJPEC,, steadily in the direction of increasing chlorine content. Due to the comonomer sequence order in the copolymers PVC, the systems PVCJPVC,, and PVG/PEC, show in the range around x = 1 an extra effect favouring phase separation. In the latter system this effect is so strong that polyvinylchloride (PVG= ,) is even incompatible with the chlorinated polyethylene P E G = , although both have the same overall composition. ZUSAMMENFASSUNG:Untersucht wurde die Vertriiglichkeit von polymeren Chlorkohlenwasserstoffen +q&,C4+ mit verschiedener Comonomersequenzordnung. Eine erste Copolymerenserie ("PVG") wurde durch Reduktion von Polyvinylchorid hergestellt, eine zweite Serie ("PEG") durch Chlorieren von Polyethylen. Die Polymer-Legierungen PECJPEC,, PVCJPVC,, und PVCJPEC,, wurden bei 30 "C und 110°C mit einer Ltjsungsfilmmethode analysiert. Im System PECJPEC,, nimmt die Mischbarkeit mit steigendem Chlorgehalt der Copolymeren stetig zu. Bei den Systemen PVG/PVC,, und PVG/PEC, zeigt sich im Bereich um x = 1 eine erhtjhte Tendenz zur Phasenseparation, die auf die bessere Comonomersequenzordnung der Copolymeren PVG zuriickzufiihren ist. Im letzteren System ist diese Tendenz so stark, daB Polyvinylchlorid (PVG= I ) sogar mit dem chlorierten Polyethylen P E G = I , das die gleiche Bruttozusammensetzung hat, nicht mischbar ist.
Miscibility can particularly easily be “tailored” with blends P (AxB1‐x)/P (AyB1‐y) of random copolymers and with blends P (Ax‐b‐B1‐x)/P (Ay‐b‐B1‐y) of diblock copolymers, where the blend components differ only in composition. The former class of blends is discussed in some generality, the latter only in one special example, where the components are a homopolymer (x=0) and a symmetric copolymer (y=0.5). Phase diagrams and phase morphologies are shown.
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