Accession Number : AD0294594

Title :   MOLECULAR STRUCTURE AND PHYSICAL BEHAVIOR OF POLYMERS

Corporate Author : AKRON UNIV OHIO INST OF RUBBER RESEARCH

Personal Author(s) : MORTON,MAURICE ; GENT,A.N.

Report Date : 05 DEC 1962

Pagination or Media Count : 1

Abstract : Stress-temperature relations wer inve tig ted for linear polyet ylene, crosslink d to varying extents by gamma irradiation, and subjected o elo gation of varying amount. The incipient crystallization t mperature T sub c was foun to be reduced o ly slightly over th range of crosslinking employ d, in me sureme ts at small xt nsions. The application of moder te extensions brought about somewhat l rger increases in T sub c. T HE INCRE SE W S L RGER FOR THE MORE IGHLY CORSSLINKED MATERIALS, O THAT A REVERSAL OF THE T sub c values appeare to occur at exten ions of about 250%. Stress changes o cryst lliza ion under isother al conditio s was examined. Stress increases were observed, co fir ing that they ar not ue solely to therm l contraction. Str ss-temperature relatio s w re determin d for crosslinked balata Clear indications of the melting of the bet crystal form were obt i ed; they suggest ha both cry tal forms can occur in oriented bundle cryst llit s S OME STUDIES HAVE BEEN CARRIED OUT ON THE CHAIN TRA SFER REACTION BETWEE POLYSTYRYL LITHIUM AN TOLUENE OR CUMENE. ( ut or) D -<($ %($(N2 +++Molecular tructure and physical behavior of polymers. Stress change nd cry t llization in crosslinked polyet ylene and trans-polyisoprene BALATA) Structur of nionic polystyrene.

Descriptors :   *ETHYLENES, *POLYMERIZATION, *POLYMERS, *RUBBER, COPOLYMERIZATION, CRYSTALLIZATION, CRYSTALS, CUMENES, ISOPRENE, MECHANICAL PROPERTIES, MELTING, MOLECULAR STRUCTURE, ORGANIC SOLVENTS, STRESSES, STYRENES, TEMPERATURE, TENSILE PROPERTIES, TOLUENES

Distribution Statement : APPROVED FOR PUBLIC RELEASE