Sample pretreatment method for measuring heteroatom content of polymer and application thereof

A technology of sample pretreatment and determination method, which is applied in the field of sample pretreatment for determining the content of heteroatoms in polymers. It can solve the problems of long digestion period, narrow application range, and low recovery rate, and achieve fast digestion speed and wide application range. , Guarantee the effect of recovery rate

Inactive Publication Date: 2014-09-03
CHINA TEST & CERTIFICATION INT GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing polymer sample pretreatment methods mainly include tube furnace combustion method. [4] , Oxygen bottle (bomb) combustion method [1-3] , high temperature firing method [5] , catalytic oxidation [6] and UV degradation [7] etc. These methods either have the disadvantages of narrow scope of application, low recovery rate, poor reproducibility, etc., or although the recovery rate can be guaranteed, they need a special digestion device for sample digestion, and the digestion cycle is long, the steps are cumbersome, and the cost is high.

Method used

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  • Sample pretreatment method for measuring heteroatom content of polymer and application thereof
  • Sample pretreatment method for measuring heteroatom content of polymer and application thereof

Examples

Experimental program
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Embodiment 1

[0026] Embodiment 1, the pretreatment of polyvinylidene fluoride (PVDF) sample and the determination of fluorine atom content

[0027] 1. Pretreatment of polyvinylidene fluoride samples

[0028] Taking pure polyvinylidene fluoride (PVDF) as a sample, sample pretreatment is carried out, and the resulting solution can be used for the determination of fluorine content therein. The sample pretreatment method includes the following steps:

[0029] 1) Preparation of polymer samples

[0030] For powdered solid polymers, no pretreatment is required, and the sample can be directly weighed and digested;

[0031] For film-like or flake-like solid polymers, cut them into pieces no larger than 2mm (length)×2mm (width);

[0032] For blocky solid polymers, scrape the surface with a blade to obtain debris for testing, or cut it into particles no larger than 1mm (length) × 1mm (width) × 0.5mm (height);

[0033] In this embodiment, a small sample of polyvinylidene fluoride is taken and cut i...

Embodiment 2

[0047] The pretreatment of embodiment 2, polyvinyl chloride (PVC) sample and chlorine atom content determination

[0048] 1. Pretreatment of PVC samples

[0049] With pure polyvinyl chloride (PVC) as sample, carry out sample pretreatment, the solution of processing gained can be used for carrying out wherein the mensuration of chlorine content, and sample pretreatment method comprises the following steps:

[0050] 1) Preparation of polymer samples

[0051] For powdered solid polymers, no pretreatment is required, and the sample can be directly weighed and digested;

[0052] For film-like or flake-like solid polymers, cut them into pieces no larger than 2mm (length)×2mm (width);

[0053] For blocky solid polymers, scrape the surface with a blade to obtain debris for testing, or cut it into particles no larger than 1mm (length) × 1mm (width) × 0.5mm (height);

[0054] In this embodiment, a polyvinyl chloride (PVC) powder sample is taken and weighed directly.

[0055] 2) Dige...

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Abstract

The invention discloses a sample pretreatment method for measuring the heteroatom content of polymer materials. The sample pretreatment method comprises the steps of sample preparation, sample resolution and dissolution and the like, and a polymer sample is completely resolved in molten potassium hydroxide (or sodium hydroxide), so as to be dissolved with pure water to a constant volume. The detection sample after sample pretreatment can be directly used for measurement in the existing heteroatom content measuring method (such as an ion chromatography method, an ion selective electrode method and an electric potential titrimetric method). The sample pretreatment method has the characteristics of simplicity and rapidity in operation, low cost, no loss of the to-be-measured sample, wide application range and the like and can be popularized and applied to sample pretreatment before the heteroatom content of the polymer materials is measured.

Description

technical field [0001] The invention belongs to the technical field of chemical analysis of polymer materials, in particular to a sample pretreatment method for measuring heteroatom content in polymers and its application. Background technique [0002] With the continuous advancement of science and technology, more and more polymer materials are used in production and life, and the quality control of polymer materials is becoming more and more important. The determination of the heteroatom content in the polymer is an important part of the quality control of the polymer. On the one hand, for polymers in which heteroatoms are an effective part of the polymer, the determination of the heteroatom content can be used to understand the content of the polymer, so as to control the amount of active ingredients in the product. For example, for chlorinated polyethylene, which is widely used in steel-plastic doors and windows, the chlorine content is the most important indicator, whi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N1/44
Inventor 郭中宝白永智崔金华梅一飞徐丹华韩蔚丁建军李曼王明玉袁庆丹刘实华赵文燕
Owner CHINA TEST & CERTIFICATION INT GRP CO LTD
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