Article
Polymer Science
Hiba Haissoune, Jean -Marc Chenal, Laurent Chazeau, Gael Sebald, Isabelle Morfin, Laurent Lebrun, Florent Dalmas, Gildas Coativy
Summary: This study investigated the temperature variation of natural rubber during rapid loading and unloading, known as the elastocaloric effect, and its impact on strain-induced crystallization kinetics and stress relaxation. The results showed that heat transfer influenced the SIC kinetics and should be taken into account when interpreting experimental results.
Article
Materials Science, Characterization & Testing
Nicolas Candau, Oguzhan Oguz, Carlos Eloy Federico, Gregory Stoclet, Jean-Francois Tahon, Maria Lluisa Maspoch
Summary: The study on strain induced crystallization (SIC) of peroxide vulcanized natural rubber (NR)/ground tire rubber (GTR) composites showed that incorporating GTR into the NR matrix enhances the reinforcement of the composites at room temperature by acting as reinforcing fillers with high carbon black content, and by nucleating SIC in the NR matrix to generate more oriented crystallites that behave as supplementary reinforcing fillers.
Article
Polymer Science
Masaki Yamano, Yoshimasa Yamamoto, Takayuki Saito, Seiichi Kawahara
Summary: The vulcanized natural rubber prepared at 130 degrees Celsius exhibited superior mechanical properties due to high stereoregularity and rapid strain-induced crystallization after vulcanization.
Article
Polymer Science
Weixiao Song, Zixuan Wang, Min Wang, Ganggang Zhang, Fanzhu Li, Xi Zhang, Yonglai Lu, Liqun Zhang
Summary: Vulcanization systems and epoxidation degree have significant effects on the microstructure and macro-properties of ENR. The influence of sulfur, dicumyl peroxide, and itaconic acid vulcanization systems on strain-induced crystallization, molecular chain orientation, and microstructure evolution of ENRs were studied. Results showed that ENR-10 with 10% epoxidation degree exhibited the best mechanical properties, and its tensile strength and elongation were significantly higher than ENR-10-DCP and ENR-10-IA.
Article
Polymer Science
Jean-Benoit Le Cam, Adel Tayeb, Sylvain Charles
Summary: This study provides the first evidence of strain-induced crystallization heterogeneities at the macroscopic scale in unfilled natural rubber during uniaxial cyclic tensile loadings, accompanied by strong memory effects. Crystallinity was evaluated using quantitative surface calorimetry based on infrared thermography, revealing heterogeneous occurrence of crystallization along the profile.
Article
Materials Science, Multidisciplinary
Daniel W. Weller, Robert Halbach, Brian Rohde, Shuhui Kang, Sumant Dwivedi, Kyle D. Mehringer, Rahul Shankar, Robson F. Storey, Sarah E. Morgan, Alexander Zabula, Xiaodan Gu, Carlos R. Lopez-Barron
Summary: This study found that introducing long-chain branching into sulfur-cured polypentenamer rubber can significantly improve its mechanical properties, with the branching structure playing a key role in strain-induced crystallization. Branched PPR showed higher tensile stress and slower crystallization compared to linear PPR, and these characteristics are not caused by the crystallization effect, but rather by reduced chain mobility.
ACS APPLIED POLYMER MATERIALS
(2021)
Article
Polymer Science
Yihao Xing, Yi Yang, Weixiao Song, Zixuan Wang, Xiaolin Li, Xiaohui Wu, Liqun Zhang
Summary: This study uses protease treatment to control the content of non-rubber components in natural rubber. The mechanical properties, dynamic properties, and crystallization kinetics of the treated rubber were compared. The results show that protease treatment shortens the solidification time, retains higher phospholipid content, improves mechanical and dynamic properties, and enhances strain-induced crystallization and crystallinity.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Materials Science, Characterization & Testing
Manabu Okui, Akihiro Kojima, Itsuki Hisamichi, Shotaro Kuriyama, Tomohisa Kojima, Tomoaki Tsuji, Taro Nakamura
Summary: This study proposes a novel method for extending the fatigue life of rubber materials by utilizing the hysteresis of strain-induced crystallization characteristics. The results confirm that the fatigue life can be prolonged by approximately 100 times using this method.
Article
Materials Science, Multidisciplinary
Qionghai Chen, Zhiyu Zhang, Yongdi Huang, Hengheng Zhao, Zhudan Chen, Ke Gao, Tongkui Yue, Liqun Zhang, Jun Liu
Summary: This study investigates the effects of structural factors on the strain-induced crystallization (SIC) and mechanical properties of NR using molecular dynamics simulations. The results show that the formation of local clusters in NR, as well as the mobility of polymer chains, are influenced by phospholipid and protein mass fraction, strength of hydrogen-bond interaction, and strength of non-hydrogen-bond interaction. Additionally, the stress-strain behavior of NR is greatly manipulated by the strength of hydrogen-bond interaction and the mass fraction of phospholipid and protein, leading to increased chain orientation and SIC compared to other elastomeric materials.
ACS APPLIED POLYMER MATERIALS
(2022)
Article
Polymer Science
Chesidi Hayichelaeh, Phattarawadee Nun-Anan, Mili Purbaya, Kanoktip Boonkerd
Summary: This study examines the properties of unfilled natural rubber compounds containing bio-oils cured with peroxide and discusses their comparison to compounds cured with sulfur. Bio-oils had no significant effect on peroxide curing but led to faster vulcanization in the sulfur system. The bio-oils strongly influenced the crosslink density of the rubber compounds. The properties of the compounds varied based on the different levels of crosslink density, with higher density resulting in increased modulus, tensile strength, and hardness, and decreased elongation at break and compression set. The use of bio-oils in sulfur-cured compounds showed less deterioration in properties compared to peroxide-cured compounds.
Article
Polymer Science
Yueqiong Wang, Hongchao Liu, Heping Yu, Pengfei Zhao, Qifang Wang, Lusheng Liao, Mingchao Luo, Tingting Zheng, Shuangquan Liao, Zheng Peng
Summary: This study examined the effects of naturally occurring network and entanglements on the stress-strain relation and strain-induced crystallization (SIC) in vulcanized natural rubber (NR). It was found that entanglements played a significant role in improving the mechanical properties of NR, and protecting the naturally occurring network and entanglements could lead to the fabrication of high-performance vulcanized NR.
Article
Materials Science, Multidisciplinary
Nicolas Candau, Noel Leon Albiter, Hector Jeannot, Maria Lluisa Maspoch Ruldua
Summary: Reducing the production of conventional polymers based on crude oil through the use of bio-based plastics and valorizing rubber wastes is crucial for mitigating the negative environmental impact of the polymer industry. In this study, PLA/NR/GTR blends were prepared, with GTR particles encapsulated in the NR matrix, resulting in improved mechanical properties.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
V. N. Khiem, J-B Le Cam, S. Charles, M. Itskov
Summary: This paper provides the first comprehensive thermo-mechanical characterization of filled natural rubber under uniaxial and biaxial loadings. The analysis evaluates energy contributions, distinguishes heat power density, and uses infrared thermography to assess strain-induced crystallinity. The experimental results contribute to a physically based modeling of the material's complex behavior.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2022)
Article
Materials Science, Multidisciplinary
V. N. Khiem, J-B Le Cam, S. Charles, M. Itskov
Summary: A physically-based constitutive model and quantitative surface calorimetry method were introduced to study strain-induced crystallization in natural rubbers. The kinetics of phase transition outside of thermodynamic equilibrium was discussed to explain the mechanisms of nonequilibrium crystallization. The use of analytical network averaging for calculating multiaxial strain-induced crystallinity showed good agreement with experimental data.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2022)
Article
Polymer Science
Junqi Zhang, Cheng Huang, Yong Zhu, Guangsu Huang, Jinrong Wu
Summary: The introduction of weak hydrogen bonds and strong metal coordination bonds as sacrificial bonds to toughen polyisoprene rubber showed different effects on the crystallization rate and crystallinity of the rubber. Under both quasistatic and dynamic loading, the behavior of sacrificial bonds varied, leading to different mechanical properties of the rubber.
Article
Materials Science, Textiles
Masatoshi Tosaka, Shohei Oue, Alice Gros, Bertrand Huneau, Erwan Verron, Sirilux Poompradub
JOURNAL OF FIBER SCIENCE AND TECHNOLOGY
(2018)
Article
Polymer Science
Masatoshi Tosaka, Kohji Tashiro
Article
Chemistry, Multidisciplinary
Lai Nang Duy, Ryo Sekiya, Masatoshi Tosaka, Shigeru Yamago, Takuya Matsumoto, Takashi Nishino, Takayuki Ichikawa, Takeharu Haino
Article
Polymer Science
Masatoshi Tosaka, Erika Shigeki
Article
Materials Science, Multidisciplinary
Alice Gros, Bertrand Huneau, Erwan Verron, Masatoshi Tosaka
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2019)
Article
Polymer Science
Masatoshi Tosaka, Daiki Kumagawa
Article
Polymer Science
Podchara Rattanakawin, Kenji Yoshimoto, Yuta Hikima, Alvin Chandra, Teruaki Hayakawa, Masatoshi Tosaka, Shigeru Yamago, Masahiro Ohshima
Article
Polymer Science
Beomsu Park, Masatoshi Tosaka, Shigeru Yamago
Summary: Isotactic poly(N, N-diethyl acrylamide) (i-PDEAA) was synthesized by ytterbium triflate/H2O-catalyzed radical polymerization and its single crystals were successfully grown from solution. The lattice constants of Form-1 crystal were determined, while those of Form-2 crystal were only roughly estimated. The study provided insights into the crystallization of i-PDEAA and its crystal polymorphisms.
Article
Polymer Science
Yuhan Jiang, Weijia Fan, Masatoshi Tosaka, Michael F. Cunningham, Shigeru Yamago
Summary: High molecular weight poly(butyl acrylate)s and diblock copolymers were successfully synthesized using water-soluble organotellurium chain transfer agents in water, achieving high monomer conversion rates and low viscosity due to stable latex formation. The presence of termination reactions in reversible deactivation radical polymerization has been a limiting factor for synthesizing HMW polymers, but high end group fidelity was confirmed through block copolymer synthesis under the current conditions.
Article
Polymer Science
Podchara Rattanakawin, Kenji Yoshimoto, Yuta Hikima, Shinsuke Nagamine, Yuhan Jiang, Masatoshi Tosaka, Shigeru Yamago, Masahiro Ohshima
Summary: A method of fabricating highly ordered nanocellular foam using UV-induced chemical foaming technique and self-assembly of block copolymer PMMA-b-PtBA was reported. Different self-assembled morphologies were investigated for their effects on the formation of nanocellular foams. It was found that cells generated from the lamella templates had higher expandability compared to those from the cylindrical templates. Increasing the molecular weight of PMMA could mitigate the drastic change in cell structure.
Article
Polymer Science
Yuhan Jiang, Weijia Fan, Masatoshi Tosaka, Shigeru Yamago
Summary: In this study, structurally controlled high-molecular-weight (HMW) PSts and block copolymers were successfully synthesized using emulsion organotellurium-mediated radical polymerization (TERP). The method demonstrated high monomer conversion, high end-group fidelity, and rapid monomer diffusion, providing a valuable route for fabricating polymer materials based on HMW PSts.
Article
Chemistry, Multidisciplinary
Masatoshi Tosaka, Hinako Takeuchi, Masato Kibune, Tianxiang Tong, Nanyi Zhu, Shigeru Yamago
Summary: Stochastic simulation of the formation process of hyperbranched polymers (HBPs) using a branch-inducing monomer, evolmer, revealed that the observed dispersities (Ds) were due to the distribution of the number of branches instead of undesired side reactions. The simulation also showed that the branch structures were well controlled and the majority of HBPs had structures close to the ideal one. Furthermore, the simulation suggested a slight dependence of branch density on molecular weight, which was experimentally confirmed.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Materials Science, Textiles
Masatoshi Tosaka
Proceedings Paper
Polymer Science
Wenjuan Li, Masatoshi Tosaka, Shigeru Yamago
REVERSIBLE DEACTIVATION RADICAL POLYMERIZATION, VOL 1: MATERIALS AND APPLICATIONS
(2018)
Article
Chemistry, Multidisciplinary
Noboru Osaka, Yuichi Minematsu, Masatoshi Tosaka
