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Volume 13, Issue 140
Displaying 1-6 of 6 articles from this issue
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II.A Distribution to Stresses Subjected the Yarns on Bending the Woven ClothesYukichi Go, Megumu Suzuki1956 Volume 13 Issue 140 Pages 507-518
Published: December 25, 1956
Released on J-STAGE: October 14, 2010
JOURNAL FREE ACCESSThe crease recovery force of fabrics depends upon the deformation recovery force of asingle filament which formed the yarn in the fabrics.As the yarns have more or less twist, both deformation of “bending” and “torsion” should be studied viscoelastically to elastic limitin small deformation and plastic region in large deformation, but the construction of thefabrics is so complicated that we should consider not only viscoelastically but also the summationsof the mutual friction forces of single filaments which are important factors.Itscalculation, therefore, is very complicated and we don't touch about the friction forces in thispapers, because the friction forces change along the length-derection of the yarn.When thewarp yarn (filling yarn) is bent at the axis of the filling yarn (warp yarn), we calculate thebending stress of central yarn and the bending and torsional stress of the side yarn for examplesof Nylon S.F. 40's and 60's yarns.View full abstractDownload PDF (2981K) -
II.The Analyses on Orientation of Drawn Model FilamentsYasuo Shinohara, Hiroshi Tanzawa1956 Volume 13 Issue 140 Pages 519-525
Published: December 25, 1956
Released on J-STAGE: February 20, 2012
JOURNAL FREE ACCESSWe tried to obtain the relation between the orientation factor f and the drawing ratio vt of viscose rayon theoretically.On the assumption that viscose rayon is formed by the network structure, the following equation is derived.
_??_
, q0, η0 means respectively the degree of the stretching of a chain and the degree of swelling on the isotopic state from which the drawing is performed.By this equation, experimental results of the previous paper were analyzed.View full abstractDownload PDF (907K) -
Takeshi Sato1956 Volume 13 Issue 140 Pages 526-530
Published: December 25, 1956
Released on J-STAGE: October 14, 2010
JOURNAL FREE ACCESSDextran produced in Japan was acid-hydrolyzed and fractionated, yielding a series offractions from which 16 were observed.The values of weight-average molecular weight andsecond virial coefficient were determined with those samples.It has evidently been shownthat the current specification on the range of weight-average molecular weight to clinicaldextrans is satisfied.The results were also examined with contrast of the values of numberaveragemolecular weight obtained from the method of end-group determination, using therelationships to intrinsic viscosity.View full abstractDownload PDF (818K) -
I. Apparatus for Nuclear Magnetic Resonance and the Second-order Transition of High PolymersSigezo Nohara1956 Volume 13 Issue 140 Pages 531-539
Published: December 25, 1956
Released on J-STAGE: October 14, 2010
JOURNAL FREE ACCESSThis paper describes an outline of the apparatus used for nuclear magnetic resonancemeasurement and some aspects of experimental results obtained in the construction. Themagnetic field of 4759 gauss was provided by a permanent magnet with a 4cm gap.Fivespecimens involved in two groups, one for unsymmetrical polymer (Buna N, Polystyrene), theother for symmetrical polymer (Polyethylene, Teflon), were investigated over a temperaturerange above the glassy transition region. Comparing the results with that of viscoelasticmeasurements, it was found that in unsymmetrical polymer there are line-width transitionscoinciding with transitions in the viscoelastic behavior, but in symmetrical polymer there aresome differences between transition regions observed in two methods.Some general aspectsof the results are discussed briefly.View full abstractDownload PDF (1530K) -
II. Solution Viscosity of N, N′-dimethylhexamethylenediaminephthalic Acid Condensation PolymersYukio Masuda1956 Volume 13 Issue 140 Pages 540-543
Published: December 25, 1956
Released on J-STAGE: October 14, 2010
JOURNAL FREE ACCESSNew resins were obtained by polycondensation of N, N′-dimethylhexamethylenediamineand phthalic acid.These resins were characterized by their better solubilities into commonorganic solvents, different from general linear poly-amides.The author has attempted tostudy the chemical structure of these polymers, and has made the measurements of the solutionviscosity in benzene.The calculated intrinsic viscosity were compared with the molecularweight by the cryoscopic method in benzene solution. Houwink-Sakurada's equation wasapplicable to these solutions, and two constants were calculated by a graphic method.Theintrinsic viscosity-molecular weight relationship, [η] =6.9×10-6M1.05was obtained. It was shown that the Staudinger's equation was applied to these polymers. The anormality of ηsp/c-c curve was observed at the region of relatively higher molecular weights.It seemed to be appropiate to think that these results were all due to the special shape and property of the polymer molecule.View full abstractDownload PDF (553K) -
Yasuyoshi Sakaguchi, Yorio Ito1956 Volume 13 Issue 140 Pages 544-548
Published: December 25, 1956
Released on J-STAGE: October 14, 2010
JOURNAL FREE ACCESSPartially acetylated (22 and 32 mol%) polyvinyl alcohols with various polymerization degreeswere prapared and the viscosity measurement carried out at the “ideal” temperature O.Itwas observed at this temperature a linear relationship between the intrinsic viscosity and thesquare root of the molecular weight. The thermodynamic parameter was calculated accordingto Fox-Flory's theory from the dependence of the intrinsic viscosity on the temperature. Thevalue was negative and the absolute value ammounts to only 1/4.5 as compared to that calculatedfrom the phase equilibrium.Some discussions are given.View full abstractDownload PDF (662K)
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