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Polymer orientation degree characterization method based on ultrasonic longitudinal waves

A technology of polymer and orientation degree, which is applied in the direction of using sound wave/ultrasonic wave/infrasonic wave to analyze solids, instruments, analysis materials, etc., to achieve the effect of easy online monitoring, low detection cost and increased complexity

Active Publication Date: 2018-09-14
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problem of characterization of the existing polymer orientation degree, the present invention proposes a polymer orientation degree characterization method based on ultrasonic longitudinal waves based on ultrasonic propagation theory, which can realize non-contact detection and online detection

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  • Polymer orientation degree characterization method based on ultrasonic longitudinal waves
  • Polymer orientation degree characterization method based on ultrasonic longitudinal waves
  • Polymer orientation degree characterization method based on ultrasonic longitudinal waves

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Embodiment Construction

[0049] In order to make the present invention more clearly understood, the present invention will be further described below according to specific examples and accompanying drawings of the present invention.

[0050] Such as figure 1 Shown is the principle diagram of the ultrasonic longitudinal wave detection of the present invention, including an ultrasonic probe 1, a container 2, an aqueous solution 3, and a sample 4. The aqueous solution 3 acts as a coupling agent, enabling ultrasonic waves to effectively enter the polymer to be tested.

[0051] A method for characterizing the degree of orientation of a polymer part, comprising:

[0052] Place the PVC sample with a flat surface horizontally in a container filled with water.

[0053] Using a water immersion ultrasonic probe, a pulse wave (ultrasonic longitudinal wave) with a certain center frequency is emitted vertically to the sample.

[0054] Use an oscilloscope to collect and receive the reflected echoes from the upper...

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Abstract

The invention discloses a polymer orientation degree characterization method based on ultrasonic longitudinal waves. The method comprises the following steps of emitting ultrasonic longitudinal wavesto a non-contact polymer sample to be tested; detecting the spreading speed c of the ultrasonic longitudinal waves in the polymer sample to be tested to obtain the orientation degree of the polymer sample to be tested shown in the description. The polymer orientation degree characterization method based on ultrasonic longitudinal waves provided by the invention has the advantages that the operation is simple; the detection cost is low; the direct contact with the tested articles is not needed; the online monitoring can be easily realized. The non-contact detection mode is used, so that the influence of high temperature of a mold die cavity on an ultrasonic probe in the injection molding process can be avoided; the increase of the mold design and manufacturing complexity is also avoided.

Description

technical field [0001] The invention belongs to the technical field of polymer detection, in particular to a method for characterizing the degree of orientation of polymers based on ultrasonic longitudinal waves. Background technique [0002] Polymers are formed by the accumulation of a large number of polymer chains. Under the action of the molding external field, the molecular chains are preferentially and orderly arranged to form a mesoscopic orientation structure. The performance of the molded product largely depends on the orientation structure formed during the molding process. The degree of orientation refers to the degree to which molecular segments in a polymer are arranged in a specific direction. Improving the orientation of molecular chains can greatly improve the physical properties, mechanical properties, and electrical properties of polymer materials, such as tensile modulus, tensile strength, fracture toughness, solvent resistance, thermal stability, and insu...

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Application Information

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IPC IPC(8): G01N29/07
CPCG01N29/07G01N2291/011G01N2291/0235
Inventor 赵朋夏能赵耀张剑锋黄俊业傅建中
Owner ZHEJIANG UNIV