E-journal of Soft Materials最新文献_第2页

Improvement of Bending Fatigue Strength for Hybrid Cords with Carbon and Glass Fibers 碳纤维与玻璃纤维混合索弯曲疲劳强度的提高

E-journal of Soft Materials Pub Date : 2012-12-30 DOI: 10.2324/EJSM.8.15

Masamori Furusawa, Yuuya Tsukada, T. Morimoto, H. Iizuka

{"title":"Improvement of Bending Fatigue Strength for Hybrid Cords with Carbon and Glass Fibers","authors":"Masamori Furusawa, Yuuya Tsukada, T. Morimoto, H. Iizuka","doi":"10.2324/EJSM.8.15","DOIUrl":"https://doi.org/10.2324/EJSM.8.15","url":null,"abstract":"Synchronous belts are rubber-composite materials with rubber, helical cords and facing fabrics. The helical cord is the tension member of the belt and is made of glass fibers, aramid fibers, or steel wires. Recent trends require increasingly high stiffness for the rubber belts. The use of carbon fibers and hybrid cords with carbon fibers are considered to be an effective way to achieve high stiffness for helical cords. This paper presents the study is to improve the bending fatigue strength of hybrid cords, where the center strand is made of carbon fibers, and the outer strands are made of glass fibers. The optimum cord composition for good bending fatigue durability is discussed following experimentation, mechanical analysis using a simplified mechanical model and FEM analysis. The model reasonably explained the initiation of the fatigue failure initiation site in the hybrid cords. The optimum cord composition was proposed for the bending fatigue strength basing on the simplified mechanical model. This was verified by experimental data showing good fatigue life. The use of such helical cords can considerably extend the operating life of synchronous belts.Copyright © 2009 by ASME","PeriodicalId":11628,"journal":{"name":"E-journal of Soft Materials","volume":"52 1","pages":"15-21"},"PeriodicalIF":0.0,"publicationDate":"2012-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84742086","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Influence of Domain Structure on The Mechanical Properties of Thermoplastic Polyurethane Materials 畴结构对热塑性聚氨酯材料力学性能的影响

E-journal of Soft Materials Pub Date : 2011-12-30 DOI: 10.2324/EJSM.7.8

Tomoe Sunada, Mizue Kuriyagawa, T. Kawamura, K. Nitta

引用次数: 3

Nonlinear Viscoelasticity of Rubber Materials: Payne Effect and Differential Dynamic Modulus 橡胶材料的非线性粘弹性:佩恩效应和微分动态模量

E-journal of Soft Materials Pub Date : 2011-12-30 DOI: 10.2324/EJSM.7.1

Yoshinobu Isono

引用次数: 1

Effect of Lithium Compounds on the S N 2 Reaction of Anionic Living Polyisoprene with 4-Bromobutoxy-tert-butyldimethylsilane in Heptane 锂化合物对阴离子活性聚异戊二烯与4-溴丁氧基-叔丁基二甲基硅烷在庚烷中sn2反应的影响

E-journal of Soft Materials Pub Date : 2010-12-30 DOI: 10.2324/EJSM.6.1

K. Takenaka, Kazuhiko Koyasu, Kohei Yamamoto, M. Miya, Hiroki Takeshita, T. Shiomi

{"title":"Effect of Lithium Compounds on the S N 2 Reaction of Anionic Living Polyisoprene with 4-Bromobutoxy-tert-butyldimethylsilane in Heptane","authors":"K. Takenaka, Kazuhiko Koyasu, Kohei Yamamoto, M. Miya, Hiroki Takeshita, T. Shiomi","doi":"10.2324/EJSM.6.1","DOIUrl":"https://doi.org/10.2324/EJSM.6.1","url":null,"abstract":"The additive effect of lithium tetrahydrofurfuryloxide (LiTHF) and alkyl lithium on the nucleophilic substitution reaction of anionic living polyisoprene with 4-bromobutoxy-tert-butyldimethylsilane (BBS) in heptane was investigated.When BBS was allowed to react with polyisoprenyllithium in heptane in the absence of any additives, considerable amount of dimeric polymers as well as aimed end-functionalized polymer were formed via lithium-halogen exchange followed by the homo coupling of the polymers. Degree of the dimer formation was dramatically suppressed when the reaction was carried out in the presence of LiTHF. Quantitative introduction of silyl-protected hydroxy group was achieved when the reaction was carried out in heptane at 0°C in the presence of LiTHF (5 eq to active chain end). Similar additive effect was observed for n-butyllithium whereas no such an effect was observed for sec-butyllithium.The cross-association of these lithium compounds with the active chain end of anionic living polyisoprene might have prevented the homo coupling of the polymers.","PeriodicalId":11628,"journal":{"name":"E-journal of Soft Materials","volume":"1 1","pages":"1-8"},"PeriodicalIF":0.0,"publicationDate":"2010-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88727481","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Distribution of Oil in a PP/EPDM Thermoplastic Elastomer 油在PP/EPDM热塑性弹性体中的分布

E-journal of Soft Materials Pub Date : 2009-08-30 DOI: 10.2324/EJSM.5.9

Y. Kikuchi, T. Okada, Takashi Inoue

引用次数: 0

Polymerization of 1,3-Dienes with Functional Groups. 5. RAFT Polymerization of N,N-diethyl-2-methylene-3-butenamide 含官能团的1,3-二烯的聚合。N,N-二乙基-2-亚甲基-3-丁酰胺的RAFT聚合

E-journal of Soft Materials Pub Date : 2009-05-30 DOI: 10.2324/EJSM.5.1

K. Takenaka, M. Matsui, Hiroki Takeshita, M. Miya, T. Shiomi

{"title":"Polymerization of 1,3-Dienes with Functional Groups. 5. RAFT Polymerization of N,N-diethyl-2-methylene-3-butenamide","authors":"K. Takenaka, M. Matsui, Hiroki Takeshita, M. Miya, T. Shiomi","doi":"10.2324/EJSM.5.1","DOIUrl":"https://doi.org/10.2324/EJSM.5.1","url":null,"abstract":"Reversible addition-fragmentation chain transfer (RAFT) polymerization of N,N-diethyl-2-methylene-3-butenamide (DEA), which is a 1,3-butadiene derivative containing a diethylamide function, was carried out in chlorobenzene with using benzyl dithiobenzoate (BDB) as a chain transfer agent. When DEA was polymerized at 70°C using azobisisobutyronitrile (AIBN) as an initiator in the presence of BDB, polymers of narrow molecular weight distribution (Mw/Mn<1.2) were obtained. The molecular weight increased proportionally with conversion, and the observed values were close to the calculated ones based on the molar ratio of monomer to BDB. This indicates that the molecular weight of the polymer can be controlled by the molar ratio of monomer to chain transfer agent. PolyDEA thus obtained contained BDB fragment which was confirmed by MALDI-TOF-MS analysis. Block copolymerization with styrene was carried out using polyDEA having BDB fragment as macro chain transfer agent. Microstructure of polyDEA was predominantly 1,4-sructure. Thus simultaneous control of the molecular weight and microstructure was achieved in the RAFT polymerization of DEA.","PeriodicalId":11628,"journal":{"name":"E-journal of Soft Materials","volume":"146 1","pages":"1-8"},"PeriodicalIF":0.0,"publicationDate":"2009-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77678424","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Simultaneous Control of Molecular Weight and 1,4-Cis Selectivity in the Polymerization of 1,3-Butadiene with N,N′-Diphenyl and 3,3′,5,5′-tetra-t-Butyl Substituted (Salen)Co(II) Complex 1,3-丁二烯与N,N ' -二苯基和3,3 '，5,5 ' -四叔丁基取代(Salen)Co(II)配合物聚合过程中分子量和1,4-顺式选择性的同时控制

E-journal of Soft Materials Pub Date : 2008-12-30 DOI: 10.2324/EJSM.4.7

K. Nakatani, K. Endo

引用次数: 0

Polymerization of 1,3-Dienes with Functional Groups. 4. 含官能团的1,3-二烯的聚合。

E-journal of Soft Materials Pub Date : 2008-12-30 DOI: 10.2324/EJSM.4.23

K. Takenaka, N. Shibata, Shinsuke Tsuchida, Hiroki Takeshita, M. Miya, T. Shiomi

{"title":"Polymerization of 1,3-Dienes with Functional Groups. 4.","authors":"K. Takenaka, N. Shibata, Shinsuke Tsuchida, Hiroki Takeshita, M. Miya, T. Shiomi","doi":"10.2324/EJSM.4.23","DOIUrl":"https://doi.org/10.2324/EJSM.4.23","url":null,"abstract":"Anionic polymerization of N,N-diethyl-2-methylene-3-butenamide (DEA), which is a 1,3-butadiene derivative containing a diethylamide function, was carried out in tetrahydrofurane (THF) under various conditions. When DEA was polymerized in THF at −78°C using potassium naphthalenide (K-Naph) or diphenylmethylpotassium (DPMK) as an initiator, a polymer of predictable molecular weight with a narrow molecular weight distribution was obtained. However, the rate of polymerization was extremely slow to reach 80% conversion after 720 h. When the polymerization temperature was raised to 20°C, a low molecular weight oligomer with a broad molecular weight distribution was obtained because of a chain transfer reaction. On the other hand, no such side reaction occurred even at 20°C, when polymerization was carried out in the presence of LiCl. Also, the chain transfer reaction did not occur in lithium naphthalenide (Li-Naph) initiated polymerization. The microstructure of the polymer prepared using a potassium counter cation was a 1 : 1 mixture of 1,4-E and 1,2- structures. In the case of Li-Naph or DPMK/LiCl systems, the microstructure was a complicated mixture of 1,4-E, 1,4-Z, and 1,2-structures.","PeriodicalId":11628,"journal":{"name":"E-journal of Soft Materials","volume":"1 1","pages":"23-29"},"PeriodicalIF":0.0,"publicationDate":"2008-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82986863","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Structure Formation and Crystallization Behavior of Ethylene-Isoprene Block Copolymers and Their Blends with Corresponding Homopolymers 乙烯-异戊二烯嵌段共聚物及其与相应均聚物共混物的结构形成和结晶行为

E-journal of Soft Materials Pub Date : 2008-12-30 DOI: 10.2324/EJSM.4.12

Yuan Gao, Hiroki Takeshita, Y. Takata, K. Takenaka, T. Shiomi

{"title":"Structure Formation and Crystallization Behavior of Ethylene-Isoprene Block Copolymers and Their Blends with Corresponding Homopolymers","authors":"Yuan Gao, Hiroki Takeshita, Y. Takata, K. Takenaka, T. Shiomi","doi":"10.2324/EJSM.4.12","DOIUrl":"https://doi.org/10.2324/EJSM.4.12","url":null,"abstract":"Time-resolved simultaneous synchrotron small-angle X-ray scattering and differential scanning calorimetry experiments have been performed on crystallization of polyethylene-polyisoprene diblock copolymers (HEI or LEI) and their blends with corresponding homopolymers, polyethylene (PE) and polyisoprene (PIp). For the neat block copolymer having a 50 wt% of the crystalline component, preexisting microphase separation structure in the melt was kept at high and low crystallization temperatures Tc (Tc≥94°C and Tc<60°C), while disrupted at intermediate Tc (60°C≤Tc<94°C). This complex behavior was interpreted by combination of two mechanisms. The behavior in the crystallization below 94°C was attributed to the competition between the crystallization and chain diffusion rates, that is, the fast crystallization rate at lower Tc makes it difficult to rearrange the phase structure in the melt. On the other hand, at a higher Tc (≥94°C), the preservation of the microphase separation structure was explained by a small degree of crystallinity due to the ethyl branch of polyethylene (hydrogenated poly(butadiene)). For HEI/PE blends, crystallization behavior was the simple superposition of those for HEI and PE, while, for HEI/PIp with a small composition of PE, suppression of crystallinity was observed. Crystallization kinetics in the neat block copolymer and all the blends was not so different from that in the PE homopolymer.","PeriodicalId":11628,"journal":{"name":"E-journal of Soft Materials","volume":"36 1","pages":"12-22"},"PeriodicalIF":0.0,"publicationDate":"2008-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73320208","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Chain Anisotropy Effect on Polymer Nonlinear Viscoelasticity 聚合物非线性粘弹性的链各向异性效应

E-journal of Soft Materials Pub Date : 2008-12-30 DOI: 10.2324/EJSM.4.1

Junhao Wu, Suguru Saitoh, S. Fujii, S. Kawahara, Yoshinobu Isono

引用次数: 2