Stress monitoring-based fiber/polymer interfacial shear crystallization on-line detector

Abstract

The invention relates to a stress monitoring-based fiber/polymer interfacial shear crystallization on-line detector. According to the detector, fibers are drawn in semi-crystalline polymer melt, and interfacial stress and an interfacial crystallization process are monitored on line to obtain relation among a drawing rate, interfacial shear stress, interfacial crystallization morphology and a polycrystalline state. The detector has the characteristics of high integration degree, high displacement accuracy, capability of monitoring the interfacial shear stress and the interfacial crystalline morphology in real time and the like. The drawing speed is accurate and stable to control, the interfacial shear stress is measured through a force measuring sensor, and variation in interfacial crystallization morphology is recorded through a polarizing microscope in real time; and meanwhile, data and images are acquired and processed through a computer. The interfacial shear stress introduced by drawing the fibers is compared with the corresponding crystallization morphology, and shear induced polymer crystallization is quantitatively and deeply researched.

Description

[0001] technical field [0002] The invention relates to a detector which draws fibers in a semi-crystalline polymer melt, monitors the interface stress and the interface crystallization process on-line, and obtains the relationship between the drawing rate, the interface shear stress, the interface crystal morphology and the polycrystalline state. Background technique [0003] The mechanical properties of composite materials are jointly determined by the matrix, reinforcing phase, and interface phase, and the interface has a crucial influence on the overall mechanical properties of the material. For semi-crystalline polymer matrix composites, interfacial crystallization behavior has a very important influence on the improvement of mechanical properties of materials. Any polymer material must be molded before it can be turned into a valuable product. The shear stress during the molding process affects the crystal structure and crystal form of the polymer, and has an importan...

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Problems solved by technology

However, this method has many defects. Most importantly, although researchers believe that the pulling fiber first affects the essential factor of shear-induced crystallization, that is, interfacial shear, and then affects its interfacial crystallization, they only try to establish The relationship between traction rate (or traction time) and interfacial crystallization is not enough to quantitatively describe how interfacial shear affects interfacial crystallization. When it cannot be avoided, a simple thermodynamic model can only be used to roughly explain; at the same time, the traction speed of fibers It cannot be precisely controlled. For example, in the past, such equipment often manually pulled the fiber, or used the method of hanging weights (after the weight was released, the weight fell due to gravity, thereby driving the fiber movement); in addition, in the past, this type of equipment often used It takes a long time to reduce the temperature from the elimination heat history temperature to the isothermal crystallization temperature with a single hot stage temperature control, and the long-term cooling does not meet the strict sense of isothermal crystallization

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