Studies on the Utilisation of Tar Acids (I)

Imoto, Eiji; Azuma, Keiiti

doi:10.5059/yukigoseikyokaishi.12.368

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“…mally but a t a substantially slower rate. [3][4][5][6][7][8][9][10][11] Liquid acenaphthylene is known to polymerize ther-…”

Section: Temperature Dependencementioning

confidence: 99%

Solid‐state polymerization of acenaphthylene induced by ionizing radiation

Chen¹

1962

J. Polym. Sci.

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The polymerization and copolymerization of acenaphthylene in solution or melt nitiate d by free-radical, ionic, and Ziegler catalysts have been reported in the literature.l-12 Acenaphthylene is a yellow crystalline material (m.p. 92OC.) having the following structure:This material offers interesting possibilities as a monomer for solid-state polymerization studies. The polymerization reaction should be capable of being initiated readily and most advantageously by irradiation techniques.The polymerization of acenaphthylene in the solid state initiated by x-rays has been undertaken in air, under nitrogen, and in vacuum. Both commercial and recrystallized acenaphthylene have been used. A General Electric Maxitron 250 was employed as the x-ray source; no filtration was used. Acenaphthylene was irradiated in tablet form (diameter, 2.83 cm.; thic!cness, 0.14 cm.; approximate weight 1 g.), placed at a distance of 5 cm. from the target to the top of the tablet. Different dose rates were obtained by varying the current (6-30 ma., 250 Itvp). Dose rates were calculated from Fe++-Fe3+ dosimetry, the size, thicltness, and density of the samples being taken into consideration. Dose rates of 0.824.1 x 106 rad/hr. were employed. The results are summarized below. I. Total Dose Dependence(A dose rate of 4.1 x 106 rad/hr. was employed. Two series of experiments were carried out. In the first, acenaphthylene as received (Columbia Southern) was polymerized a t ambient temperature (2535°C.) in air. The results show (upper curve, Fig. 1) that the per cent polymerization versus total dose after an induction is directly porportional to the total dose. I n the second series of experiments, acenaphthylene as received waa recrystallized twice from methanol. It was then polymerized under

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“…mally but a t a substantially slower rate. [3][4][5][6][7][8][9][10][11] Liquid acenaphthylene is known to polymerize ther-…”

Section: Temperature Dependencementioning

confidence: 99%