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Volume 39, Issue 8
Displaying 1-7 of 7 articles from this issue
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Particle Size Measurements for Polymer Latexes by Liquid Chromatography Using Porous Silica PackingsTadaya KATO, Hajime TAKAMI, Akira TAKAHASHI1982 Volume 39 Issue 8 Pages 487-492
Published: August 25, 1982
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSParticle size measurements for methylmethacrylate (MMA) -methacrylic acid (MAA) copolymer latexes were carried out by porous hydrodynamic chromatography (PHDC) using porous silica packings of which pore sizes were larger than latex particle diameters. The packings were treated with 3-chloropropyl trichlorosilane to reduce adsorption due to the surface hydroxyl group. The particle diameters of the latexes, which were estimated by the diameter-retention volume calibration curve obtained with the standard polystyrene latexes, were in good agreement with the hydrodynamic ones measured by dynamic light scattering method.View full abstractDownload PDF (1107K) -
Sadaatsu YAMAGUCHI1982 Volume 39 Issue 8 Pages 493-498
Published: August 25, 1982
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSThere are two types of polytetrafluoroethylene (PTFE) emulsion particles, i. e., granular and rod-like particles. Fine powder of PTFE was prepared from the PTFE emulsion. A morphological study was made on two types of band structures of the PTFE resin obtained from the fine powder, i. e., sheaf-like bands located at the resin surface and bands with striations located in the inner part of the resin. The results definitely show that the sheaf-like bands are formed by the folding of the polymer chain in the emulsion particles and that the difference between the sheaf-like bands at the surface and the inner bands arises from the difference in the internal stress.
In fact, the sheaf-like was easily changed to a band seen in the fracture surface by applying tension or compression. Chain-folded structure found in the inner band can be accounted for by the same mechanism as for the sheaf-like band in which chain folding perpendicular to the longitudinal axis of the band takes place.View full abstractDownload PDF (2703K) -
Takashi FUKUTOMI, Hiroyuki MATSUI, Toshio KAKURAI1982 Volume 39 Issue 8 Pages 499-505
Published: August 25, 1982
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSThe method to prepare the soluble intramolecular-crosslinked copolymer by the copolymerization of vinyl monomer and divinyl compound was developed. Styrene and divinylbenzene were copolymerized under usual monomer concentration in benzene containing diphenyl disulfide (telogen). Copolymerization was continued till three hours before gelation time (the time when the solution lost its fluidity). Then the vigorous stirring was offered to the solution for several hours. The soluble copolymers were obtained with very high conversion (maximum 74%) and high concentration (maximum 35g/100ml). Crosslinked three dimensional structure of these polymers was confirmed by viscometric and osmometric measurements.View full abstractDownload PDF (995K) -
Nobuhide YAHIRO, Kazuo ASAKAWA1982 Volume 39 Issue 8 Pages 507-514
Published: August 25, 1982
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSOptically active 1- (R) -2-diethylethylenimine has been prepared from (R) -2-ethylamino-1-butanol, obtained by the reaction of ethylbromide with (R) -2-amino-1-butanol, sulfuric acid and sodium hydroxide. The polymerization of 1- (R) -2-diethylethylenimine catalyzed by boron trifluoride etherate gave a very viscous polymer, whose molecular weight was estimated to be about 3000-5000. The ring opening of the unsymmertically substituted 1- (R) -2-diethylethylenimine occurred only at the β-position. The polymerization of the monomer gave an optically active stereoregular polymer.View full abstractDownload PDF (1270K) -
Yoshihiro NAKASHIMA, Hiroyuki FUKUDA1982 Volume 39 Issue 8 Pages 515-521
Published: August 25, 1982
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSRadical oligomerization of (2-isobutyl-2-methyl-1, 3-dioxolane-4-yl) methyl acrylate and (2-ethyl-1, 3-dioxolane-4-yl) butyl acrylate were carried out by using several kinds of chain transfer agents such as 2-mercaptoethanol, thioglicolic acid, lauryl mercaptan, benzaldehyde, butyraldehyde, iodoacetic acid, carbon tetrachloride, bromoform and carbon tetrabromide. The reactivity and the mechanism in the crosslinking of resultant oligomers with UV or heat treatments were investigated.
The oligomers prepared by using halogen-containing chain transfer agents were easily crosslinked by UV irradiation or thermal treatments, but the others were of no reaction. The oligomers having halogen residue at the end of the polymer chain easily released the corresponding halogen acid on UV irradiation, indicating that the crosslinking was caused by acceleration of the C-O bond cleavage of the 1, 3-dioxolane ring by the acid.View full abstractDownload PDF (1232K) -
Kunio MORI, Yoshiro NAKAMURA, Masaru KUMAGAI1982 Volume 39 Issue 8 Pages 523-530
Published: August 25, 1982
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSVulcanizing adhesion of ethylene-propylene terpolymer (EPDM) to Poly (vinyl chloride) (PVC) was investigated on the assumption that the peel strength of adherends depends upon the interfacial thickness and the degree of crosslinking between EDPM and PVC. The crosslinking between EPDM and PVC, which had different reactive points each other, was performed by the addition of 1, 3, 5-triazine-2, 4, 6-trithiol and magnesium oxide to PVC, and of oxidative agents such as chloranil to EPDM. The adherends with high peel strength were obtained by the addition of plasticizers to PVC and of softening agents to EPDM, which was ascribed to enhancement in the interfacial thickness between these otherwise mutually incompatible polymers and its formation velocity. The peel strength was increased by heat treatment due to increase in the degree of crisslinking in the interface. Adhesion conditions such as press temperature and time also showed an influence on peel strength.View full abstractDownload PDF (1466K) -
Hiroshige MURAMATSU, Kazuo KODAIRA, Kazuhide MATSUURA, Katsukiyo ITO1982 Volume 39 Issue 8 Pages 531-534
Published: August 25, 1982
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSCondensation copolymerizations of o-acetoxybenzoic acid (OAB) with 4-acetoxytetrafluoro- (ATBF), p-acetoxy-, 3-methoxy-4-acetoxy-, and 3, 5-dimethoxy-4-acetoxybenzoic acid were carried out at 220°C at 60mm Hg in an atmosphere of nitrogen. The mole fraction of -o-OC6H4CO- units (F1) in copoly (OAB-ATFB) was larger than that of OAB (f1) in monomer feed, whereas f1 was nearly equal to F1 in the other copolymers. On recondensation at 400°C at 0.1mm Hg, copoly (OAB-ATFB) preferentially eliminated -p-OC6F4CO- units, whereas the other copolymers predominantly eliminated -o-OC6H4- units.View full abstractDownload PDF (575K)
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