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Direct experimental proof was obtained that 1,2,4,5-tetrachlorobenzene is soluble in solid and fused high-density polyethylene. It was shown that the shapes of semi-crystalline-polymer—low-molecularmass-crystalline-compound phase diagrams obtained using DSC were independent of whether the system was considered to be a mixture of two crystalline compounds or a liquid with a crystalline compound. In contrast with mixtures of low-molecular-mass crystalline compounds that form eutectic mixtures of strictly defined compositions, mixtures of the polymer and low-molecular-mass compound were characterized by a certain range of compositions in which both components crystallized simultaneously....
A series of composite materials of a new type — foam organoplastics — was obtained from foamed polyimide binders reinforced with Arimid T polyimide felt, and commercially available aromatic monomers were used. Use ofDPO (3,3′,4,4′-diphenyloxidetetracarboxyic acid) dianhydride in the H-complex allows obtaining a melt of lower viscosity (300 Pa-sec), and the viscosity almost does not change at 95°C...
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