ISSN:
0449-2951
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
Powdered poly(m-diethnylene benzene) can be dissolved in hot nitrobenzene, and thin clear sheets having a yellow color and a tensile strength approaching 9000 psi can be cast from this solution. When the polymer powder is heated rapidly in vacuo, it explodes gently at about 180°C. to yield carbon, but it can be annealed at 150°C. and then heated to form carbon without the explosive reaction. The major gaseous decomposition products of the explosive reaction are methane and hydrogen. The polymer film can be crystallized in tetrahydrofuran and shows excellent spherulitic growth. The crystalline film as well as aged noncrystalline film degrades when heated rapidly, but without explosive decomposition. Some indication of the mechanism of decomposition is provided by infrared studies of the film pyrolyzed at 100°C. intervals to 600°C. X-ray diffraction studies show that the polymer may exist in amorphous and crystalline forms In the amorphous form, the diffraction maximum indicates an average interchain separation of 4.28 A., substantially less than for other polymers. Chars prepared by heating the polymer give diffraction patterns similar to those for amorphous carbon blacks. A related substance, poly(p-diethynylene benzene), is an intractable crystalline powder having a hexagonal unit cell, a0 = 7.74 A., c0 = 8.97 A., containing three monomer units.
Additional Material:
3 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pol.1964.100020516
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