GB/T 45709-2025Determination of absolute molecular mass and molecular mass distribution of polyethylene terephthalate fibre and chip — Advanced polymer chromatography-multi angle laser light scattering (APC-MALLS) (English PDF)

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1: Structure and drafting rules for standardization documents" Drafting.

Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.

This document is proposed and coordinated by the National Technical Committee on Standardization of Chemical Fibers (SAC/TC586).

This document was drafted by: Zhejiang Sci-Tech University, Modern Textile Technology Innovation Center (Jianhu Laboratory), Xinfengming Group Co., Ltd., China Chemical Fiber Industry Association, Jiangsu Hengli Chemical Fiber Co., Ltd., Zhejiang Tongkun New Materials Research Institute Co., Ltd., Shanghai Textile Industry Industry Technical Supervision Institute, Sinopec Yizheng Chemical Fiber Co., Ltd., Zhejiang Guxiandao Green Fiber Co., Ltd., Jiangsu New Vision Advanced Function Fiber Innovation Center Co., Ltd., Wuxi Jintong High Fiber Co., Ltd., Yuyao Dafa Chemical Fiber Co., Ltd., Dezhou Shengyuan Fiber Technology Co., Ltd.

Co., Ltd., Zhejiang Yuyue New Materials Co., Ltd., Tongkun Group Zhejiang Hengteng Differential Fiber Co., Ltd., Shanghai Textile Group Testing Standards Co., Ltd.

Co., Ltd., Shandong Zhongzhike Standardization Research Institute Co., Ltd.

The main drafters of this document are: Lv Wangyang, Chen Wenxing, Chen Haixiang, Zhuang Yaozhong, Lv Jiabin, Zhao Jinguang, Tang Yuechao, Li Deli, Li Hongjie, Su Fengxian, Shi Jiaoxue, Xu Jinlong, Qian Qiyuan, Gu Jun, Wang Xinzhong, Sun Wenxun, Shen Jiansong, Chen Yan, Lin Zhenyong, He Chen.

Polyethylene terephthalate fiber and chips Determination of molecular weight and its distribution for highly efficient polymers APC-MALLS Warning---People who use this document should have practical experience in formal laboratory work. This document does not address all possible safety issues.

The user is responsible for taking appropriate safety and health measures and ensuring compliance with the conditions stipulated in relevant national laws and regulations.

For certain solvents, please read the Material Safety Data Sheet (SDS) carefully.

1 Scope

This document describes the determination of absolute molecular weight of polyethylene terephthalate (PET) by high performance polymer chromatography-multi-angle laser light scattering.

Methods of mass and its distribution.

This document is applicable to polyethylene terephthalate fibers and chips, and other PET products shall be implemented accordingly.

2 Normative references

GB/T 4146

3 Terms and definitions

GB/T 4146 (all parts) and the following terms and definitions apply to this document.

4 Principle

The APC was combined with multi-angle laser light scattering (MALLS) and a refractive index detector (RID).

When the dispersed polymer solution flows through the chromatographic column, it will be eluted in the order of molecular weight from large to small.

For polymer solutions, the scattered light intensity in any direction is proportional to the molecular weight of the polymer.

The absolute molecular mass and molecular weight distribution coefficient of the sample are calculated by the response value of each point obtained by mass and RID.

This test method is a method for determining absolute molecular mass and its distribution.