Biaxial uniaxial tension device for in-situ structure detection in combination with scattering of X-rays and experimental method thereof

Abstract

The invention provides a biaxial uniaxial tension device for in-situ structure detection in combination with the scattering of X-rays and an experimental method of the biaxial uniaxial tension device. The device comprises a high-precision servo motor (1), a torque sensor (2), a precise gear (3), a heating furnace (3), a reverse tension shaft (5) and a Labview software control system (6). A guide rail, the precise gear (3) and a reverse tension rod are adopted for transmission. The rotating speed of the servo motor (1) and the rotational displacement are controlled by the Labview to realize precise displacement and speed tension control. The temperature distribution of the heating furnace (3) is uniformed and the thermal degradation at high temperature of samples is reduced by forced nitrogen flow. A temperature monitoring point is preset in the heating furnace (3) and a temperature controller is adopted to precisely control the temperature. Temperature jump is realized between two heating furnaces (3) of different temperature. The device has the advantages of small volume, light mass, simplicity in disassembling and installing and the like, is particularly suitable for the combination of synchrotron radiation experimental line stations and is a good device for studying the crystallization of polymer melt induced by a flow field.

Description

technical field [0001] The present invention relates to a technology for studying the relationship between polymer melt structure evolution and external field parameters by using synchrotron radiation X-ray scattering, in particular to a biaxial uniaxial stretching device and its experimental method for in-situ structure detection combined with X-ray scattering , which can study the structural evolution behavior of different polymer samples under different stretching temperatures, different strain rates and strains. Coupling the crystallinity and orientation degree of the polymer sample obtained by X-ray scattering with the tensile mechanical data can obtain the relationship between the external field parameters and the structural properties of the polymer. It is used to reveal the mechanism of flow field induced polymer crystallization and guide the actual processing. Background technique [0002] Polymer materials need to be shaped and processed before they can be used as...

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Problems solved by technology

The original extensional rheometer has been able to precisely control the temperature and achieve independent control of strain and strain rate, but it has a serious problem, that is, it needs to be raised to a high temperature to eliminate the heat of the polymer sample in the study of the flow field induced polymer crystallization experiment. When the history is lowered to the experimental temperature and the flow field is applied, this process will inevitably take a long time. During such a long time, polymers with low melt strength are easy to sag, which greatly reduces the experimental efficiency and reduces experimental sample selection window

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