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Volume 16, Issue 175
Displaying 1-11 of 11 articles from this issue
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II. Rotational Effect of the Side Chain GroupAkira Miyake1959 Volume 16 Issue 175 Pages 667-672
Published: November 25, 1959
Released on J-STAGE: October 14, 2010
JOURNAL FREE ACCESSAs an illustration of the rotational effect of the side chain, C8 rotation of the three proton system like the CH8 group is discussed with the aid of the diffusion equation under a threefold hindering potential. The correlation time τc of NMR is obtained in high and low temperature approximations, respectively. T2 and T1 are given in terms of τc, and experimental data of T2 for polyisobutylene obtained by Powles are analyzed through the present theory.View full abstractDownload PDF (836K) -
Ichiro Sakurada, Yasuhiko Nukushina1959 Volume 16 Issue 175 Pages 673-677
Published: November 25, 1959
Released on J-STAGE: October 14, 2010
JOURNAL FREE ACCESSA polypropylene fiber (sample A) was prepared by melt spinning from commercial polypropylene powder and elongated at 100°C to 4.7 times of its original length (sample B). The degree of crystallinity of sample A and B was determined by the use of an X-ray counter and found to be 0.39 and 0.52 respectively. The meridian small-angle scattering intensity was also measured and a distinct peak was observed by sample A, whereas the peak was somewhat indistinct by sample B. The peaks correspond to the periods of 160 and 151Å respectively. The Iε2-ε curve was constructed from the equatorial small-angle scattering intensity according to the propcsal of Kratky and the most probable distances between crystallites were found to be 80Å for sample A and 76 and 55Å for sample B.View full abstractDownload PDF (1113K) -
Ichiro Sakurada, Yasuhiko Nukushina, Hiroshi Tanzawa1959 Volume 16 Issue 175 Pages 678-681
Published: November 25, 1959
Released on J-STAGE: October 14, 2010
JOURNAL FREE ACCESSThe degrees of crystallinity of the primary gel of regenerated cellulose were measured with an X-ray counter in the undried and air-dried states. It was observed that the crystallization had already proceeded to a considerable degree in the course of regeneration and the subsequent aging and the air-drying resulted in a slight increase of the degree of crystallinity.View full abstractDownload PDF (1123K) -
VII. The Alkaline Cleavage Reaction of Silicon-Hydrogen Bonds in OrganopolysiloxanesAkira Yamada1959 Volume 16 Issue 175 Pages 682-687
Published: November 25, 1959
Released on J-STAGE: October 14, 2010
JOURNAL FREE ACCESSThe alkaline cleavage reaction of silicon-hydrogen bonds in methylhydropolysiloxanes has been studied, especially in regard to the effect of alcohols on the reaction rate. A role of the added alcohol is to promote the reaction due to the nucleophilic attack by alkoxy anion on silicon atom. The rate of the reaction depends mainly upon the structures of alcohols: it suffers from the steric hindrance of the attacking alkoxy anion. An investigation by infrared spectroscopy of organopolysiloxanes containing silicon-hydrogen bonds is also described comparing with dimethylpolysiloxanes.View full abstractDownload PDF (990K) -
V. Degree of Polymerization, Film-forming Temperature and Tensile Strength of the FilmYasuji Ohtsuka1959 Volume 16 Issue 175 Pages 688-692
Published: November 25, 1959
Released on J-STAGE: October 14, 2010
JOURNAL FREE ACCESSThe plasticized polymethyl methacrylate latices were prepared by the emulsion polymerization of methyl methacrylate containing DBP in both L method (layer system) and A method (agitated system). The effects of the amount of DBP and of the difference of preparation method, that is under L or A to the degree of polymerization of these polymers, and filmforming temp. of the latices were investigated. The tensile strength of films prepared from polymer solution was measured. These results were discussed theoretically and also compared with the results of the previous papers.View full abstractDownload PDF (1137K) -
I. Synthesis of Model Substances for Polyacrylonitril-1Toshihiro Takata, Masakazu Taniyama1959 Volume 16 Issue 175 Pages 693-698
Published: November 25, 1959
Released on J-STAGE: October 14, 2010
JOURNAL FREE ACCESSAs the model substances for polyacrylonitril we could get following compounds from cyanoacetic ester. As the dimer models: 2, 4-dicyano-pentane, 1, 3-dicyanobutane, and glutaronitrile. As the trimer models: 2, 4, 6-tricyanoheptane and 1, 3, 5-tricyanohexane. As the tetramer model: 2, 4, 6, 8-tetracyanononane.View full abstractDownload PDF (1039K) -
III. The Influence of γ-ray Irradiation in the Presence of InitiatorsSeizo Okamura, Hiroshi Inagaki, Saburo Saeki1959 Volume 16 Issue 175 Pages 699-704
Published: November 25, 1959
Released on J-STAGE: October 14, 2010
JOURNAL FREE ACCESSThe rates of bulk polymerization of styrene (St) and methyl methacrylate under the influence of irradiation by Co-60 in the presence of benzoyl peroxide (BPO) and 2, 2′-azoisobutyronitrile (AIBN) were determined. The rate of polymerization in addition of BPO accelerated more than that by AIBN, and St was more sensitive to the addition of initiators than MMA. The rate of polymerization and the molecular weight of polymer obtained was compared with the catalytic polymerization at the same conditions, and also γ-induced decomposition of BPO in the organic solvent was determined. The acceleration of polymerization may be explained by the decomposition of BPO by γ-rays, and the decomposition rate of BPO was found to be more rapid than that of the decomposition of monomers. It may be suggested from our experiments that the recombination of radicals and the induced decomposition of BPO increase at high concentrations of initiator.View full abstractDownload PDF (1278K) -
I. Reaction Velocity of Epoxy Resin (EPON 828) with AminesChuji Aso, Kosuke Yamamoto, Saburo Akiyoshi1959 Volume 16 Issue 175 Pages 705-708
Published: November 25, 1959
Released on J-STAGE: October 14, 2010
JOURNAL FREE ACCESSThe reactions of EPON 828 with many primary or secondary monoamines and some polyamines at 60 or 100°C were carried out, where the velocity of disappearance of the epoxy group was determined with the infrared analysis. It was shown that the velocities of addition with anilines were somewhat accelerated by introducing methyl or methoxy group in psituation. The polymerization by opening the epoxide ring catalyzed with tertiary amines was also investigated and the apparent activation energy in the polymerization catalyzed with triethyl amine was about 12 kcal per mol.View full abstractDownload PDF (748K) -
VIII. Hardening Reaction of DihydroxydiphenylmethanesRyoji Yokoyama, Takahito Yamanishi1959 Volume 16 Issue 175 Pages 709-712
Published: November 25, 1959
Released on J-STAGE: October 14, 2010
JOURNAL FREE ACCESSThe hardening reaction of dihydroxydiphenylmethanes (diphenols) and hexamine was examined by the method previously reported. The heat-hardened product of diphenol and hexamine exhibits different solubility according to the kind of solvent used. The product tends to become insoluble after the viscosity of the solution increases. 2, 2′ diphenol becomes insoluble most readily, while 2, 4′ diphenol and 4, 4′ diphenol seem to show the same ease of insolubility. Since rate constants of the hardening reaction with the formation of insoluble matter of those diphenols are found to be remarkably small in comparison with that of phenol novolac, it was shown that diphenols share no direct relation with the hardening reaction of novolac.View full abstractDownload PDF (754K) -
1959 Volume 16 Issue 175 Pages 712a
Published: 1959
Released on J-STAGE: October 14, 2010
JOURNAL FREE ACCESSDownload PDF (188K) -
1959 Volume 16 Issue 175 Pages 712b
Published: 1959
Released on J-STAGE: October 14, 2010
JOURNAL FREE ACCESSDownload PDF (188K)
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