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Volume 43, Issue 12
Displaying 1-10 of 10 articles from this issue
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Katsuhiko NAKAMAE, Naoto HIRAYAMA, Satoshi TANIGAWA, Kenji SUMIYA, Tsu ...1986 Volume 43 Issue 12 Pages 833-838
Published: December 25, 1986
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSAcrylic ester-acrylic acid copolymers were synthesized as model binders of magnetic paints. The dis-persibility of γ-Fe2O3 was investigated. The following results were obtained. The saturated adsorbance of copolymers on γ-Fe2O3 increased with the increase in content of COOH groups, and then the dispersibility of γ-Fe2O3 was improved. However, when the content of COOH groups were over 2 mol%, the saturated adsorbances of polymers were constant and the dispersibility of γ-Fe2O3 were reduced. The saturated adsorbance of copolymers on γ-Fe2O3 decreased with the increase in the number of carbon atoms in the acrylic ester group, however the dispersibility of γ-Fe2O3 was improved. Thus the dispersibility of γ-Fe2O3 was explained by the adsorption behavior of polymers.View full abstractDownload PDF (949K) -
Ko-Shao CHEN, Yaw-Nan CHANG, Juin-Yih LAI1986 Volume 43 Issue 12 Pages 839-846
Published: December 25, 1986
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSPreparation of films by plasma polymerization of FC-43 (perfluorotributylamine) and coating of CA (cellulose acetate) or TPX [poly (4-methyl pentene-1)] with FC-43 were studied. The films formed by plasma polymerization contain CF2, CF2-CF3, C-N, C=O, N-H and OH groups. In the presence of these functional groups, degradation of the film was initiated at a low temperature (100°C). The surface energy of CA and TPX is reduced by coating with plasma polymerized FC-43, particularly in the dispersion part of the surface energy, γsd. The blood clotting time ratio of the film to glass was increased with a decrease of γsd. The biocompatibility of films was found improved, especially in the plasma polymerized FC-43 on CA film. The permeability constant ratios, PO2/PN2 and PAr/PN2, increased in plasma polymerized FC-43 on TPX film. Thus the plasma polymerized FC-43 on TPX films could be applied to the gas separation processes and the membrane type artificial lung.View full abstractDownload PDF (2129K) -
Akio TAKAHASHI, Masahiro ONO, Motoyo WAJIMA, Shinichi KADONO1986 Volume 43 Issue 12 Pages 847-855
Published: December 25, 1986
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSThe reactions of 4, 4′-methylene bis (phenyl cyanamide) (BCA) and 4, 4′-methylene bis (o-methylphenyl cyanamide) (BMCA) with N-phenyl maleimide (PM) were investigated. Differential thermal analysis (DTA) and infrared analysis (IR) of oligomers obtained by heating BCA or BMCA with PM at 100°C in solvent showed that the conversion of cyanamide to cyanoguanidine and the addition of PM to biscyanamide or cyanoguanidine proceeded in the process of oligomerization. On heating at 170 or 220°C the oligomers polymerized with ring-formation of melamine or isomelamine, and cyano groups of the oligomers were consumed during this reaction.View full abstractDownload PDF (1020K) -
Zun-Kui CAO, Yoshio OKAMOTO, Koichi HATADA1986 Volume 43 Issue 12 Pages 857-861
Published: December 25, 1986
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSIn order to prepare highly syndiotactic Poly (methyl methacrylate) (PMMA) with narrow molecular weight distribution (MWD), polymerization of methyl methacrylate (MMA) was studied in tetrahydrofuran at -78°C using various alkyllithiums RLi, as initiators (R=1, 1-diphenyl-3-methylpentyl, 1, 1-diphenylhexyl, fluorenyl, indenyl, triphenylmethyl, 1, 1, 3-triphenylpropyl, 1, 1-diphenyldecyl, benzyl, octyl, butyl). Initiators having bulky alkyl group such as 1, 1-diphenyl-3-methylpentyllithium, 1, 1-diphenylhexyllithium and fluorenyllithium polymerized MMA rapidly to give syndiotactic (syndiotactic triad ca. 85%) PMMAs with narrow MWD. Stereoregularities of the PMMAs were independent of the molecular weight of the polymer. The molecular weight of the polymer could be easily controlled up to 200, 000. Polymerization of MMA with butyllithium or octyllithium proceeded slowly and gave a PMMA with broad MWD, which may be due to the side reaction of the initiator with the carbonyl group of MMA.View full abstractDownload PDF (766K) -
Masaki KOHOYAMA, Taiji MIYAKE, Yoshihiro MASUDA, Fumikazu YAMAGATA1986 Volume 43 Issue 12 Pages 863-871
Published: December 25, 1986
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSTo study the relationship between ethylene propylene diene methylene (EPDM) crystallite and the tensilestrength of raw rubber, copolymerized by ethylene propylene and one of the unconjugated diolefines, ethyl-ene propylene methylene (EPM) with a high ethylene content was prepared by using the so-called Zieglercatalyst. By X-ray, IR and FIR studies, deformation of crystal lattice, packing energy of the crystallite, and the changes of the solid structure were investigated. Ethylene and butene-1 coplymer, and ethylene and 4-methylpentene-1 copolymer were also studied to examine the effect of the short alkyl branch on the ethylenecrystal structure. The following results were obtained.
(1) The degree of crystallinity of EPM is higher than that of the other α-olefine copolymers.
(2) The tensile strenght was remarkably decreased by the increment of the lenght of a-axis.
(3) The intermolecular force of each of the above copolymer molecules in the crystal lattice was do-creased by the increment of the length of a-axis. The lattice vibration and the splitting width of the rockingvibration of CH2 confirmed this.
(4) The relationship of the crystal structure and solid structure of the above copolymers were also elucidated.View full abstractDownload PDF (1358K) -
Junichi SAEKI, Aizo KANEDA, Tadao SHINODA1986 Volume 43 Issue 12 Pages 873-879
Published: December 25, 1986
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSFlow characteristics of silica filled trial epoxy resin systems having neither a curing agent nor a catalystwere examined in the absence of any chemical reaction that would cause a viscosity rise. A plunger extrusiontype of capillary rheometer was used in this study. Both molten materials, which had the same resin com-position except filler content, showed a power law fluid behaviour of slightly shear thinning over the observedranges of temperature and shear rate. The values of power law index ranged from around 0.83 to 0.95. Viscosity was found to be dominated by temperature rather than by shear rate under the present experi-mental conditions. A temperature difference of 40 degrees brought about a decade of viscosity change. The relationship between temperature and viscosity of each material was described by an Andrade's equation.View full abstractDownload PDF (1198K) -
Katsuhiko NAKAMAE, Takashi NISHINO, Katsuhiko HATA, Tsunetaka MATSUMOT ...1986 Volume 43 Issue 12 Pages 881-888
Published: December 25, 1986
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSThe temperature dependence of the elastic modulus Et of crystalline regions of polyethylene (PE) in thedirection perpendicular to the chain axis has been investigated by X-ray diffraction. The lattice spacings ofthe equatorial reflections increase with increasing temperature. The thermal expansion coefficient of the (200) plane is larger than that for other planes and changes discontinuously around 65°C. At room temperature, the values of Et for the (110), (200) and (020) planes are 4.5, 3.4, and 3.7 GPa, respectively. However, thesevalues decreased monotonously with increasing temperature. This is similar to the decrement when PE crys-tallites become disordered. The anisotropy of Et values became remarkable with increasing temperature; this tendency is in accordance with the anisotropy of the thermal expansion coefficient in the ab plane ofPE crystal. These results suggest that the decrement of Et with increasing temperature is because the interac-tions between the chain became weaker as the result of the thermal expansion.View full abstractDownload PDF (1922K) -
Hiroshi KIMURA, Izumi KAWAKAMI, Fumio SUZUKI1986 Volume 43 Issue 12 Pages 889-894
Published: December 25, 1986
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSPoly (4, 4′-oxydiphenyl cyclopentanone-2, 5-dipropamide) (POPCP) containing cyclic ketone groups in itsmain chain was prepared by use of 1-chloro-2-pbeny1-4-methyl-1, 2-dihydro-1, 5, 2, 3-phosphoxadiazole as con-densation agent. The obtained POPCP was soluble in DMF, DMSO and H2SO4 etc. The number averegemolecular weight and interaction parameter of DMF were determined to be 1.5×104 and 0.20±0.02, respec-tively, from osmotic pressure. POPCP was crosslinked with its carboxyl groups by UV-ray irradiation andit became insoluble in any solvents above menthioned. Measurements of the degree of swelling with DMFindicated that POPCP was crosslinked at 4-6 points of the polymer (ca. 40 mers) by irradiation. Thepervaporation experiments of water/alcohol and water/DMF systems were carried out using these originaland irradiated POPCP membranes. In each case, water was permeated extremely selectively in the wideregion of composition, even though DMF is solvent of POPCP. The membrane irradiated after swellingtreatment with water/DMF (1/1) showed large permeabilities, because of the vanishing of the crystal region. By irradiation, the range of composition of feeds showing maximum permeabilities was shifted to higherwater content. If the two membranes will be used alternatively, a large flux of water will be obtained overa wide range of composition.View full abstractDownload PDF (1040K) -
Hideo KUNISADA, Yasuo YUKI1986 Volume 43 Issue 12 Pages 895-900
Published: December 25, 1986
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESS2-Amino-4- (p-chloroanilino) -6-isopropenyl-1, 3, 5-triazine (ACIT) has Polymorphic forms. The three crys-talline forms melt at 142°C (α-form), 130°C (β-form) and 137°C (γ-form). On melting and recrystallization, the unstableβ- and γ-forms transform into the stable α-form. The heat of fusion measured by DSC was 5.7 kcal/mol for the α-form and 4.9 kcal/mol for the β-form. Polymerization exotherm was observed in DSCcurves above the melting point of the α-form. The heat of polymerization and ceiling temperature in themelt state of ACIT were-11.0 kcal/mol and 170°C, respectively, as determined by dynamic DSC measure-ment. The equilibrium monomer concentrations [M] e at 143-170°C were determined by isothermal DSCmeasurement. The heat of polymerization and ceiling temperature of ACIT obtained from [M] e were 11.2kcal/mol and 171°C, respectively. These values are in good agreement with those measured by dynamicDSC.View full abstractDownload PDF (915K) -
Tsutomu SHIMOKAWA, Tadatomi NISHIKUBO1986 Volume 43 Issue 12 Pages 901-904
Published: December 25, 1986
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSPoly [4- (vinyloxy ethoxy) styrene] was synthesized by the reaction of poly (4-vinylphenol) and 2-chloroethyl vinyl ether using tetrabutyl-ammonium bromide as a phase transfer catalyst under various reaction conditions. Photochemical reactivity of the polymer was examined in the presence of several crosslinking reagents. When 2, 6-bis (azidebenzal) -4-methyl cyclohexanone was used as a crosslinking reagent, the polymer showed highest photosensitivity.View full abstractDownload PDF (633K)
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