GB/T 23442-2009 English PDF

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GB/T 23442-2009: Determination of structure and morphology for the precursors of polyacrylonitrile-based carbon fibers
Status: Valid

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GB/T 23442-2009	459	Add to Cart	4 days	Determination of structure and morphology for the precursors of polyacrylonitrile-based carbon fibers	Valid

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Basic data

Standard ID: GB/T 23442-2009 (GB/T23442-2009)
Description (Translated English): Determination of structure and morphology for the precursors of polyacrylonitrile-based carbon fibers
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: Q23
Classification of International Standard: 83.120
Word Count Estimation: 20,257
Date of Issue: 2009-03-28
Date of Implementation: 2010-01-01
Regulation (derived from): National Standard Approval Announcement 2009 No.4 (Total No.144)
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary: This standard specifies the determination based carbon fiber precursor structure and morphology of polyacrylonitrile (PAN). This standard applies to the determination of polyacrylonitrile (PAN) -based carbon fiber precursor (hereinafter referred to as raw silk) of average molecular weight and molecular weight distribution, copolymer composition, crystal orientation function area, , stereoregularity surface elements, surface topography and surface roughness, microvoids defects, glass transition temperature, pre-oxidation and thermal effects of weight loss. Also applies to the determination of PAN-based carbon fiber surface elements, surface topography and surface roughness and micro- pore defects.

GB/T 23442-2009: Determination of structure and morphology for the precursors of polyacrylonitrile-based carbon fibers

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Determination of structure and morphology for the precursors of polyacrylonitrile-based carbon fibers ICS 83.120 Q23 National Standards of People's Republic of China Determination of PAN-based carbon fiber precursor structure and morphology Posted 2009-03-28 2010-01-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

The standard proposed by China Building Materials Federation. The standard fiber-reinforced plastic by the National Standardization Technical Committee (SAC/TC39) centralized. This standard was drafted. Institute of Chemistry, Jilin University, China University of Science and Technology. Drafters of this standard. Tang Yalin, Xu Jian, high gold Xi, Liu Fen, Chen Gang, Yan Shouke, Li Lin, Lu Fei, Shen Yan, Wang Chunzhong, Huang Zufei. This standard was first published. Determination of PAN-based carbon fiber precursor structure and morphology

1 Scope

This standard specifies the determination based carbon fiber precursor structure and morphology of polyacrylonitrile (PAN). This standard applies to the determination of polyacrylonitrile (PAN) based carbon fiber precursor (hereinafter referred to as precursor) of average molecular weight and molecular weight distribution, a total of Polyethylene composition, stereoregularity, crystal orientation function area, the surface elemental composition, surface morphology and surface roughness, microvoid defects, a glass transition temperature Degree, pre-oxidation and thermal effects TGA. Also applicable to the determination of PAN-based carbon fiber surface elemental composition, surface morphology and surface roughness and Microvoids defects. 2 PAN-based carbon fiber precursor molecular weight and molecular weight distribution width index was measured by gel permeation chromatography 2.1 Summary of Method According to molecular size, the length of the column in the retention time, with a differential refractive index detector measure its concentration leachates, too The molecular weight distribution of the test substance to the descending curve of gel permeation chromatography. According to known molecular weight standards are defined between leaching volume Vp e formula and molecular weight M relationship and the parameters are calculated from the number average Molecular weight, weight average molecular weight and the molecular weight distribution breadth index value. 2.2 Reagents and materials 2.2.1 N, N- dimethylformamide (DMF), AR; 2.2.2 lithium bromide (LiBr), AR; 2.2.3 organic solvent filtration membrane, pore size 0.45μm. 2.3 instruments and equipment 2.3.1 Gel permeation chromatography. including columns, column oven, infusion pumps, injection device, a differential refractive index detector test, and with the computer Should data processing software; 2.3.2 Analytical Balance. a sense of the amount of 0.1mg; 2.3.3 Vial. glass, 1mL; 2.3.4 ultrasonic cleaning; 2.3.5 syringe. not less than 1μL. 2.4 Sample Preparation The lithium bromide with N, N- dimethylformamide mixture solvent of 0.05mol/L of the filters in an organic solvent at room temperature, filtered Reserve. Take raw silk samples 3mg ~ 7mg into the above solvent to prepare a mass fraction of 0.3% to 0.7% of the sample solution in At 40 ℃ ~ 50 ℃ to fully dissolve the sample, and then the organic solvent filtration membrane filter sample was placed in a vial. 2.5 Procedure 2.5.1 2.4 will be formulated solvent degassing after ultrasound treatment, pour gel permeation chromatography storage agent bottle, the solvent through the column When the flow rate was 1.0mL/min. , Column a column temperature of 50 ℃ ± 5 ℃. 2.5.2 Selection least three known weight average molecular weight (molecular weight in the range 103 to 106), narrow distribution (not more than 3) polyacrylonitrile As a standard sample, which were obtained leaching volume concentration change curve by differential refractive index detector, according to the formula (1) and to get the progressive fitting Polyacrylonitrile calibration curve. The calibration curve used to calculate the molecular weight and molecular weight of PAN carbon fiber precursor sample distribution breadth index. lgM = A-B Vp e (1) Where. M --- molecular weight; rounded; Vp e --- leaching volume in milliliters (mL); ......

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