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GB/T 34247.2-2018 English PDF

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GB/T 34247.2-2018: Determination of the unsaturation of isobutene-isoprene rubber -- Part 2: 1H-NMR method
Status: Valid

Standard ID	Contents [version]	USD	STEP2	[PDF] delivered in	Standard Title (Description)	Status	PDF
GB/T 34247.2-2018	English	119	Add to Cart	3 days [Need to translate]	Determination of the unsaturation of isobutene-isoprene rubber -- Part 2: 1H-NMR method	Valid	GB/T 34247.2-2018

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Basic data

Standard ID	GB/T 34247.2-2018 (GB/T34247.2-2018)
Description (Translated English)	Determination of the unsaturation of isobutene-isoprene rubber -- Part 2: 1H-NMR method
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	G35
Classification of International Standard	83.040.10
Word Count Estimation	6,662
Date of Issue	2018-12-28
Date of Implementation	2019-11-01
Issuing agency(ies)	State Administration for Market Regulation, China National Standardization Administration

GB/T 34247.2-2018: Determination of the unsaturation of isobutene-isoprene rubber -- Part 2: 1H-NMR method

---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 the unsaturation of isobutene--isoprene rubber--Part 2. 1H--NMR method ICS 83.040.10 G35 National Standards of People's Republic of China Isobutylene-isoprene rubber (IIR) unsaturation Determination Part 2. Nuclear magnetic resonance spectroscopy Part 2. 1H-NMR method Published on.2018-12-28 2019-11-01 implementation State market supervision and administration China National Standardization Administration issued

Foreword

GB/T 34247 "Isobutylene-isoprene rubber (IIR) unsaturation determination" is divided into two parts. --- Part 1. Iodometric method; --- Part 2. Nuclear magnetic resonance spectroscopy. This part is the second part of GB/T 34247. This part is drafted in accordance with the rules given in GB/T 1.1-2009. This part was proposed by the China Petroleum and Chemical Industry Federation. This part is under the jurisdiction of the National Rubber and Rubber Products Standardization Technical Committee (SAC/TC35). This section was drafted. China Petroleum & Chemical Corporation Beijing Beihua Institute Yanshan Branch, China Petroleum & Chemical Corporation North Jingyanshan Branch, Shantou Toubo Petrochemical Co., Ltd. Rubber Branch, Yiweiyi Rubber Research Institute Co., Ltd., China National Petroleum Petrochemical Research Institute Co., Ltd. The main drafters of this section. Bu Shaohua, Wu Chunhong, Luo Junjie, Huang Ling, Yu Hongyu, Zhao Chuanhua, Wang Chao, Li Xiaoyin, Li Shuzhi, Liu Sha, Liu Bozhen. Isobutylene-isoprene rubber (IIR) unsaturation Determination Part 2. Nuclear magnetic resonance spectroscopy Caution - Personnel using this standard should have practical experience in formal laboratory work. This standard does not indicate all possible security questions. The user is responsible for taking appropriate safety and health measures and ensuring compliance with the relevant national regulations.

1 Scope

This part of GB/T 34247 specifies the determination of isobutylene-isoprene rubber by nuclear magnetic resonance spectroscopy [commonly known as butyl rubber (IIR)] Method of unsaturation. This section applies to IIR raw rubber.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article. Pieces. For undated references, the latest edition (including all amendments) applies to this document. GB/T 6379.2 Accuracy of measurement methods and results (accuracy and precision) Part 2. Determining Basic method of sex and reproducibility GB/T 15340 natural and synthetic raw rubber sampling and its sample preparation method

3 Method summary

A certain amount of IIR sample is dissolved in deuterated chloroform, and the nuclear magnetic resonance spectrum of the sample is measured under the specified parameters to obtain a different The peak area of different protons in the structure of pentadiene and isobutylene. Through the chemical shift of the protons in different chemical environments and the integral area value Determine the degree of unsaturation of the IIR.

4 reagents

Deuterated chloroform (CDCl3). purity greater than 99.8% (molar fraction), containing 0.03% (volume fraction) of tetramethylsilane (TMS) as internal Standard, NMR grade.

5 instruments and equipment

5.1 Nuclear magnetic resonance spectrometer. Fourier transform nuclear magnetic resonance spectrometer (FT-NMR) with a frequency of 400 MHz or higher. 5.2 Analytical balance. can be accurate to 0.1mg. 5.3 Sample tube. 5mm outer diameter.

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