巻号一覧
28 巻, 12 号
選択された号の論文の5件中1～5を表示しています
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鈴木 淳, 大平 道泰, 佐藤 昭久1972 年 28 巻 12 号 p. 481-491
発行日: 1972/12/10
公開日: 2008/11/28
ジャーナル フリーIn this paper thermal diffusivity of wet fabrics is studied by a dynamic method of a periodic change of temperature and the following results are obtained:
(1) Variation of temperature in an artificial climate room was used as a periodic heat source.
This method is advantageous for heat control and is suitable to measure thermal conductivity of wet fabrics because water in a sample can be distributed evenly under these conditions.
(2) The thermal diffusivity (κ) was measured by this method and the thermal conductivity (λ) was calculated from the relation λ=κcρ, where c is the apparent specific heat and ρ the apparent density. The apparent density and the apparent specific heat of dry and wet fabrics were calculated from the densities and the specific heats of air, water and fabrics.
(3) For the experimental results obtained, thermal diffusivity of various wet fabrics can be assumed to be constant regardless of water content.
(4) The thermal conductivities of various dry samples are about 1-2×10-4 cal/cm-sec. °C and change in the range of about 2-10×10-4 cal/cm•sec. °C with the increase of water content of fabrics.抄録全体を表示PDF形式でダウンロード (750K) -
田中 善蔵1972 年 28 巻 12 号 p. 492-497
発行日: 1972/12/10
公開日: 2008/11/28
ジャーナル フリーWool graft copolymers were synthesized by the use of water-methyl methacrylatesurfactant system in the absence of initiator.
The results obtained are as follows:
(1) The third components such as non-ionic, anionic and cationic agents have remarkable effect upon the weight increase of wool, graft efficiency, and average degree of polymerization of isolated polymer. The amount of grafted polymer decreases in the order non-ionic> anionic _??_ cationic. Generally, graft efficiency increases with increase in the amount of grafted polymer. Average degree of polymerization of isolated polymer depends on the type of surfactant, but not on the concentration of surfactant at a given temperature.
(2) In the case of polymerization using non-ionic surfactant, weight increase of wool depends upon the amounts of the emulsifier solution and of monomer, but not on the amount of wool.
However, graft efficiency depends on the amount of wool. Average degree of polymerization of isolated polymer does not depend on the amounts of the emulsifier solution, monomer and wool. In the presence of wool fibers, degree of polymerization of isolated polymer is lower than that of polymer obtained by thermal polymerization. As for the grafting mechanism, it is supposed that chain transfer reaction of polymer radical to wool molecules occurs in the amorphous region of wool fibers.抄録全体を表示PDF形式でダウンロード (442K) -
田中 善蔵1972 年 28 巻 12 号 p. 498-503
発行日: 1972/12/10
公開日: 2008/11/28
ジャーナル フリーMethyl methacrylate was polymerized in the presence of wool, water and carbon tetrachloride under a variety of conditions. Through the determination of the weight increase of wool, graft efficiency and average degree of polymerization of isolated polymers, following results were obtained.
(1) A small amount of water is necessary for successful grafting.
(2) The weight increase of wool increases markedly at the presence of a small amount of CCl4. For example, the weight increase of wool reached about 800% with little homopolymer when the reaction was carried out for 3 hr, at 75°C in the system including 2% CCl4 to the monomer.
(3) The average degree of polymerization of grafted polymer was considerably lower than that of the simultaneously obtained homopolymer.抄録全体を表示PDF形式でダウンロード (396K) -
寺田 弘司1972 年 28 巻 12 号 p. 504-515
発行日: 1972/12/10
公開日: 2008/11/28
ジャーナル フリーStructural changes of acrylic fibers of various compositions by stretching were investigated, and the relation between the fibrillar structure of as-spun fibers and the stretching behavior was studied.
The results obtained are as follows:
(1) In the case of stretching as-spun fibers with gross fibrils and large pores, the degree of the orientation of the crystallite increases remarkably with the increase in stretch ratio, accompanied with the fibrillar orientation, while the apparent density of the fibers does not change appreciably. On the other hand, in the case of stretching as-spun fibers with fine fibrils and small pores, the orientations of both fibrils and crystallite proceed gradually, and the apparent density of the fibers increases, At the same time, fibrils recombine with or separate from one another during stretching.
(2) The larger the specific surface area of as-spun fibers, the lower is the degree of orientation of crystallite after the stretching, and the specific surface area is related linearly to the degree of orientation. This relation holds good not only in the case of DMSO-H2O spinning bath, but also in the case of ordinary wet spinning of acrylic fibers, This fact shows that the stretching behaviors of acrylic fibers are determined exclusively by the fibrillar structure formed during coagulation.抄録全体を表示PDF形式でダウンロード (2472K) -
長野 正満, 亀田 清隆1972 年 28 巻 12 号 p. 516-521
発行日: 1972/12/10
公開日: 2008/11/28
ジャーナル フリーIn order to improve the activity of polyester film for tin, alkali saponification was employed and the effect of free carboxylic acid in film on the uptake of stannous chloride was studied. The following results were obtained.
a) The saponification rate of polyester film with alkali solution is given by the following equation.
dX/dt=kA X: dissolved polymer (g)
k: rate constant
A: surface area of film
b) The production of free carboxylic acid in film by alkali saponification is accelerated with reaction time until it ceases after certain interval.
c) The stannous chloride uptake increases with the free carboxylic acid content in the film and the rate is described by Fick's equation. DSC annalysis suggested the occurrence of 2(-COO) + Sn++ type reaction at the early stage of the process.
d) The copper uptake of the saponificated and SnCl2 treated film increases with the tin content and is proportional to time.抄録全体を表示PDF形式でダウンロード (360K)
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