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首页> 外文会议>Meeting of the Rubber Division, American Chemical Society Apr 29-May 1, 2002 Savannah, Georgia >New Insights into Structural Developments in Natural Rubber during Uniaxial Deformation by In-Situ Synchrotron X-Ray Diffraction
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New Insights into Structural Developments in Natural Rubber during Uniaxial Deformation by In-Situ Synchrotron X-Ray Diffraction

机译：原位同步加速器X射线衍射单轴变形过程中天然橡胶结构发展的新见解

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摘要

Molecular orientation and strain-induced crystallization of vulcanized natural rubber during uniaxial deformation were studied via in-situ synchrotron wide-angle X-ray diffraction (WAXD). The high intensity of synchrotron X-rays and new image analysis methods made it possible to estimate mass fractions of the strain-induced crystals and the amorphous chains in both oriented and un-oriented states. Contrary to the conventional conception, it was found that in highly stretched natural rubber, most chains remained un-oriented in the amorphous phase; only a few percent of the amorphous chains were oriented and rest of the chains were in the crystalline phase. This indicates that stress has induced a network of microfibrillar crystals that is responsible for the elastic properties. The new information has prompted us to reconsider the roles of molecular orientation and induced crystallization on the mechanical behavior in natural rubber.
机译：通过原位同步加速器广角X射线衍射（WAXD）研究了硫化天然橡胶在单轴变形过程中的分子取向和应变诱导结晶。同步加速器X射线的高强度和新的图像分析方法使得可以估计取向和未取向状态下的应变诱导晶体和非晶链的质量分数。与常规概念相反，发现在高度拉伸的天然橡胶中，大多数链在无定形相中保持未取向。仅百分之几的无定形链是取向的，其余的链处于结晶相。这表明应力已经诱导了微纤维晶体网络，该网络负责弹性性能。新信息促使我们重新考虑分子取向和诱导结晶对天然橡胶力学行为的作用。

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