著者

石森 綱行 渡辺 大介 新井 幸三

出版者

一般社団法人 繊維学会

雑誌

Journal of Fiber Science and Technology (ISSN:21897654)

巻号頁・発行日

vol.75, no.6, pp.72-92, 2019-06-10 (Released:2019-06-20)

参考文献数

40

被引用文献数

2

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The hair straightening method applying heat-treatment with glyoxylic acid (GA) at about 180 ̊C was studied. Straightening effect was estimated by shampooing test. The stress-strain relationship of GA/heattreated hair was also studied. It was revealed that from the WAXS, DSC study and stress-strain characteristics of treated sample, new crosslinking is introduced into the rod region of the intermediate filament (IF), a slight decrease in the degree of crystallinity but an increase in the thermal stability of the α-crystallites. The initial modulus and extensional work of the treated sample were markedly increased as compared to untreated sample. It was demonstrated that such large internal stress accumulated in the keratin network chain disappeared by relaxation treatment in water at 52 ̊C for 1 h. A part of the new cross-linking is destroyed when the treated hair is extended, but residual stable cross-linking to extension contributes to increase of initial modulus of the hair. Study of SAXS showed that the interspace distance between IFs increased about twice as much as the value of untreated sample. SEM observation shows that oblateness of the hair decreased by 10%, and cross-sectional shape changed from elliptical shape to circular shape which followed by increase of cross-sectional area. This phenomenon was considered to be due to the stress relaxation occurring in shampooing process throughout the cleavage of SS bonds located interfacial region between hard IF and soft KAP materials in water. Shampooing test of GA/heat-treated sample showed excellent set-ability. It was concluded that introduction of GA crosslinks into IF rod region resulted in a modified IF with higher modulus of elasticity than that of untreated hair, which means that the increase of resilience maintains the straight conformation exhibiting excellent straightening effect.

著者

河原 豊 栗原 夏実 大野 岳輝 渡部 邦彦 田中 俊一 山本 真揮 脇坂 博之

出版者

一般社団法人 繊維学会

雑誌

Journal of Fiber Science and Technology (ISSN:21897654)

巻号頁・発行日

vol.78, no.7, pp.114-120, 2022 (Released:2022-07-22)

参考文献数

17

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The waste chicken feathers were treated with the enzymes (dissociating disulfide bonds) produced by thermophilic Meiothermus ruber H328, and then the treated feathers were milled and subjected to the hot-press compression molding. It was found that the recrystallization of the feather keratin was interfered with to some extent due to the lack of S-S bonds. On the other hand, the slight reinforcement of the feather resin with the wood fibers was effective to enhance the tensile behavior and the thermal stability of the feather resin.

著者

哈 斯 木村 照夫

出版者

一般社団法人 繊維学会

雑誌

Journal of Fiber Science and Technology (ISSN:21897654)

巻号頁・発行日

vol.73, no.12, pp.355-362, 2017-12-10 (Released:2017-12-28)

参考文献数

21

被引用文献数

1 1

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A new type of paper, which composition is mixed of PLA and cellulose, was developed through heat molding process in this study. After folding of paper, this high performance paper contained thermoplastic PLA can be molded by heating and produced to the crafts. The properties of paper before and after the heating were examined and the results demonstrated their characteristics with high performance. In particular, the folding test showed that the developed paper was folded easily by hand. From the results of heat shrinkage test, it was also shown that the heat shrinkage ratio of the paper was suppressed by mixing cellulose. When PLA fiber content is lower than 60 wt%, heat shrinkage of the paper does not occur after heating. The results of tensile tests showed that heating increases the tensile strength of the paper and the tensile strength reaches the maximum value at 20 wt% PLA content.

著者

石森 綱行 渡辺 大介 新井 幸三

出版者

一般社団法人 繊維学会

雑誌

Journal of Fiber Science and Technology

巻号頁・発行日

vol.75, no.6, pp.72-92, 2019

被引用文献数

2

---

<p>The hair straightening method applying heat-treatment with glyoxylic acid (GA) at about 180 ̊C was studied. Straightening effect was estimated by shampooing test. The stress-strain relationship of GA/heattreated hair was also studied. It was revealed that from the WAXS, DSC study and stress-strain characteristics of treated sample, new crosslinking is introduced into the rod region of the intermediate filament (IF), a slight decrease in the degree of crystallinity but an increase in the thermal stability of the α-crystallites. The initial modulus and extensional work of the treated sample were markedly increased as compared to untreated sample. It was demonstrated that such large internal stress accumulated in the keratin network chain disappeared by relaxation treatment in water at 52 ̊C for 1 h. A part of the new cross-linking is destroyed when the treated hair is extended, but residual stable cross-linking to extension contributes to increase of initial modulus of the hair. Study of SAXS showed that the interspace distance between IFs increased about twice as much as the value of untreated sample. SEM observation shows that oblateness of the hair decreased by 10%, and cross-sectional shape changed from elliptical shape to circular shape which followed by increase of cross-sectional area. This phenomenon was considered to be due to the stress relaxation occurring in shampooing process throughout the cleavage of SS bonds located interfacial region between hard IF and soft KAP materials in water. Shampooing test of GA/heat-treated sample showed excellent set-ability. It was concluded that introduction of GA crosslinks into IF rod region resulted in a modified IF with higher modulus of elasticity than that of untreated hair, which means that the increase of resilience maintains the straight conformation exhibiting excellent straightening effect.</p>