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New insight into stretch induced structural evolution of α trans-1,4-polyisoprene characterized by real time synchrotron WAXS and SAXS measurements

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Abstract

Real time synchrotron wide angle and small angle X-ray scattering (WAXS and SAXS, respectively) were used to characterize the stretch induced structural evolution of α trans-1,4-polyisoprene (trans-PI). 2D WAXS results indicated two ensembles of crystalline modifications with distinctive orientation modes coexisted during stretching. Stretching transformed part of the monoclinic α phase into highly oriented orthorhombic β phase at strain ε = ~0.4. The β phase had rather high orientational degree with polymer chains parallel to the stretching direction, while the orientational degree of α phase was much lower. Complemented by qualitative 2D SAXS analysis, it was found that amorphous layer deformation and intralamellar chain slip dominated at different stretching stage. The melt and recrystallization process of α phase which led to the formation of β phase was also investigated. Formation of two interpenetrating networks of crystalline skeleton (constructed by residual α and β crystals) and amorphous entanglement accounted for the stress-hardening in the late stage.

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Acknowledgements

The authors are grateful for the financial support of Science and Technology Innovation Platform Project of Ningbo-Super Bionic Material Technology and Its Application in Marine Disaster Prevention and Mitigation (Grant No. 2011A31002), the National Recruitment Program of Global Experts (1000 Plan) and K.C. Wong Magna Fund of Ningbo University. Prof. Liangbin Li, Guoqiang Pan (NSRL) and Jie Wang (SSRF) are warmly thanked for their help on synchrotron WAXD and SAXS testing.

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Authors and Affiliations

  1. Faculty of Materials and Chemical Engineering, Ningbo University, Ningbo, 315211, People’s Republic of China

    Geng-Sheng Weng, Jin-Biao Bao, Yu-Ci Xu & Zhong-Ren Chen

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  1. Geng-Sheng Weng
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  2. Jin-Biao Bao
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  3. Yu-Ci Xu
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  4. Zhong-Ren Chen
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Correspondence to Geng-Sheng Weng or Zhong-Ren Chen.

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Weng, GS., Bao, JB., Xu, YC. et al. New insight into stretch induced structural evolution of α trans-1,4-polyisoprene characterized by real time synchrotron WAXS and SAXS measurements. J Polym Res 20, 104 (2013). https://doi.org/10.1007/s10965-013-0104-x

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