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A Method for Characterizing Crystallinity of Polymer Products Based on Ultrasonic Velocity

An ultrasonic and polymer technology, which is applied in the direction of using sound wave/ultrasonic wave/infrasonic wave to analyze solids, can solve the problems of the lack of economical and effective polymer crystallinity measurement methods, the destructiveness of polymer products, and the lack of versatility. Market application prospect and marketing value, increasing actual usability, effect of low price

Active Publication Date: 2017-02-22
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, most of the measurement methods of crystallinity of polymer products are destructive measurement methods, such as differential scanning calorimetry (DSC), polarized light microscopy (POM) and density measurement, etc., the above methods need to cut part of the material in the polymer product It is destructive to polymer products and has great limitations in actual production and application.
In addition, there are also some non-destructive measurement methods for polymer crystallinity, such as X-ray diffraction (WAXD) and small-angle laser light scattering (SALS). These methods have problems such as expensive equipment, cumbersome use, and poor versatility. There are certain limitations in industrial applications, currently mostly used in laboratory research
The lack of economical and effective polymer crystallinity measurement methods has become a major bottleneck in the actual production process of forming and manufacturing high-performance polymer products

Method used

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  • A Method for Characterizing Crystallinity of Polymer Products Based on Ultrasonic Velocity
  • A Method for Characterizing Crystallinity of Polymer Products Based on Ultrasonic Velocity
  • A Method for Characterizing Crystallinity of Polymer Products Based on Ultrasonic Velocity

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Embodiment 1

[0043] In this embodiment, the polymer material is polylactic acid (PLA), such as figure 1 As shown, the implementation steps of the method for characterizing the crystallinity of polymer products based on ultrasonic velocity in this embodiment are as follows:

[0044] 1) Measure the known crystallinity as x 1 The ultrasonic velocity v of the polymer product 1 ;

[0045] 2) Measure the known crystallinity as x 2 The ultrasonic velocity v of the polymer product 2 ;

[0046] 3) According to the formula,

[0047]

[0048] Calculation of the ultrasonic velocity v for a completely amorphous polymer product a ;

[0049] 4) According to the formula,

[0050]

[0051] Calculation of ultrasonic velocity v for fully crystalline polymer articles c ;

[0052] 5) measure the ultrasonic velocity v of the polymer product, according to the formula,

[0053]

[0054] Obtains the crystallinity x of the polymer article.

[0055] Crystallinity of polymer product in step 1) x 1...

Embodiment 2

[0075] In this embodiment, the polymer material is selected polypropylene (PP), such as figure 1 As shown, the implementation steps of the method for characterizing the crystallinity of polymer products based on ultrasonic velocity in this embodiment are as follows:

[0076] 1) Measure the known crystallinity as x 1 The ultrasonic velocity v of the polymer product 1 . According to the water immersion ultrasonic measurement method, in the present embodiment, the crystallinity of the polymer product is x 1 is 67.72%, the ultrasonic velocity v of the polymer product 1 It is 1521.57m / s.

[0077] 2) Measure the known crystallinity as x 2 The ultrasonic velocity v of the polymer product 2 ; According to the water immersion ultrasonic measurement method, in the present embodiment, the crystallinity of the polymer product is x 2 is 79.07%, the ultrasonic velocity v of the polymer product 2 It is 1827.42m / s.

[0078] 3) According to the formula,

[0079]

[0080] Calculati...

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Abstract

The invention discloses a characterization method of the degree of crystallinity of a polymer product based on ultrasonic wave velocity. The implementation steps of the method are as follows: 1), measuring the ultrasonic wave velocity v1 of a polymer product with the degree of crystallinity of x1; 2), measuring the ultrasonic wave velocity v2 of a polymer product with the degree of crystallinity of x2; 3), calculating the ultrasonic wave velocity va of a non-crystallizable polymer product; 4), calculating the ultrasonic wave velocity vc of a completely crystallizable polymer product; 5), measuring the ultrasonic wave velocity v of the polymer product and obtaining the degree of crystallinity x of the polymer product. The invention provides a nondestructive measuring method for the degree of crystallinity of the polymer product, is low in cost, convenient to use, expected to provide a brand new and universal experimental measurement means for research on crystallization of polymer products, and has a huge market application prospect and a high market promotion valve.

Description

technical field [0001] The invention relates to the field of polymer forming processing, in particular to a method for characterizing the crystallinity of polymer products based on ultrasonic velocity. Background technique [0002] Due to its excellent processing and use properties, polymers have been widely used in various fields of the national economy. At present, the total output of polymer products in my country has reached 30 million tons per year and is growing at a rate of 8% to 10%. Crystallization is one of the microscopic forms of polymer products, which directly affects the physical and mechanical properties of the product, such as strength, stiffness, thermal properties and transparency. For example, when the crystallinity of biomaterial polylactic acid (PLA) increases from 3.2% to 33.9%, its heat distortion temperature can be increased from 27.5°C to 99.7°C, its tensile modulus can be increased by 15.6%, and the elongation at break can be increased from 6.6%. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/07
Inventor 赵朋彭一燕傅建中贺永杨伟民汪晓蔓
Owner ZHEJIANG UNIV
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