GB/T 21864-2008 English PDF

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GB/T 21864-2008: Standard test method for molecular weight averages and molecular weight distribution of polystyrene -- High performance size-exclusion chromatography
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 21864-2008	434	Add to Cart	4 days	Standard test method for molecular weight averages and molecular weight distribution of polystyrene -- High performance size-exclusion chromatography	Valid

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Basic data

Standard ID: GB/T 21864-2008 (GB/T21864-2008)
Description (Translated English): Standard test method for molecular weight averages and molecular weight distribution of polystyrene -- High performance size-exclusion chromatography
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: A80
Classification of International Standard: 13.300
Word Count Estimation: 22,297
Date of Issue: 2008-05-12
Date of Implementation: 2008-09-01
Quoted Standard: ASTM D691; ASTM D883; ASTM D2857; ASTM D3016; ASTM E685
Adopted Standard: ASTM D5296-2005, IDT
Regulation (derived from): Announcement of Newly Approved National Standards 2008 No. 8 (No. 121 overall)
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 performance size exclusion chromatography (HPSEC) Determination of average molecular weight linear soluble polystyrene (Mw) and molecular weight distribution methods. This method is not an absolute method, requires the use of narrow molecular weight distribution polystyrene standards commercially available materials for calibration. This standard applies to the elution volume containing molecular weight components, polystyrene standard material in determining the extent of sample measurement (molecular weight generally 2000g. mol-1 ~ 2000000g. mo1-1).

GB/T 21864-2008: Standard test method for molecular weight averages and molecular weight distribution of polystyrene -- High performance size-exclusion chromatography

---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.
Standard test method for molecular weight averages and molecular weight distribution of polystyrene. High performance size-exclusion chromatography ICS 13.300 A80 National Standards of People's Republic of China Polystyrene average molecular weight and molecular weight distribution Standard Methods High Performance Size Exclusion Chromatography Posted 2008-05-12 2008-09-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

This standard is equivalent to using the American Society for Testing and Materials standard ASTMD5296.2005 "average molecular weight and polystyrene Distribution Standard Methods High Performance Size Exclusion Chromatography "(in English), its technical content and the methods described above is exactly the same. Appendix B of this standard is a normative appendix, Appendix A is an information appendix. This standard is managed by the National Standardization Technical Committee chemicals dangerous (SAC/TC251) and focal points. This standard is drafted by. China Inspection and Quarantine Science Research Institute, the Chemical Institute of Standardization. The main drafters of this standard. Yu Wen Lin, Falls Apart, Wang Junbing, Zhou Xin, Hao Nan, Mei Jian, Wang Xiaobing, Wang Lifeng, Sun Xin, Wang Zheng. This standard is the first release. Polystyrene average molecular weight and molecular weight distribution Standard Methods High Performance Size Exclusion Chromatography

1 Scope

1.1 standard specifies the determination of soluble linear polystyrene average molecular weight (M) by high performance size exclusion chromatography (HPSEC) and points The method of molecular weight distribution. This method is not an absolute method requires the use of a commercially available narrow molecular weight distribution polystyrene standard substance for calibration. This standard applies to elution volume containing molecular weight components of the sample was measured (polystyrene standard molecular weight in the range of substances identified in the general In 2000g · mol-1 ~ 2000000g · mol-1). 1.2 HPSEC Unlike conventional size exclusion chromatography SEC (reference gel permeation chromatography GPC), Mita per plate is SEC 10 times (See ASTMD883 and ASTMD3016). HPSEC system consists of a low volume liquid chromatography components, small column filled pores Particles (3μm ~ 20μm). HPLC instrumentation and automatic data processing system for data acquisition and processing. 1.3 standard uses SI units. 1.4 This standard does not give all the relevant security, if there are other security should be combined with use. Responsibility of the user of this standard to build Establish safety and health codes, regulations limit the application of the test during operation. Chapter 9 provides for specific prevention measures.

2 Normative references

The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent Amendments (not including errata content) or revisions do not apply to this standard, but to encourage the parties to the agreement according to the study Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard. ASTMD691 Determination Test Method Standard Specification between precision laboratory studies ASTMD883 plastic Definition ASTMD2857 polymer dilute solution viscosity measurement method ASTMD3016 Liquid Exclusion Chromatography Terms and the relationship between the use of standards ASTME685 liquid chromatography using a standard fixed wavelength photometric detection means test Practice

3 Terms and Definitions

The following terms and definitions apply to this standard. 3.1 Technical terms used in this standard plastic see ASTM883. 4. Summary 4.1 Method of polystyrene sample dilution solution into the mobile phase containing the same solvent. The mobile phase and loaded polymer by color The column (or series of columns), you can use the column packing particles, organic semi-rigid gel, rigid solid, porous particles, polymer molecules according to size Separate order. Since the beginning of injection Detector continuously monitors out from the column elution volume (time), the outflow from the column separated according to molecular size, And in accordance with the concentration of molecular separation is detected and recorded. By calibration curve, elution volume (time) can be converted to each molecular weight of the sample A molecular weight parameters can be molecular weight/density data is calculated.

5 meaning and scope

5.1 General Application Molecular weight (M) and molecular weight distribution (MD) is a performance parameter of the polymer sample, it is widely used in performance studies. For example. Observation ......

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