A non-destructive method using low-field nuclear magnetic resonance for characterizing the molecular weight of PBAT during thermo-oxidative degradation

被引：6

作者：

Hou, Fang ^{[1
]}

Jiang, Zhenlin ^{[1
,2
,3
]}

Zhu, Min ^{[1
]}

Liu, Yang ^{[1
]}

Zhu, Keyu ^{[1
]}

Xu, Jiamin ^{[1
]}

Wang, Chaosheng ^{[3
]}

Wang, Huaping ^{[3
]}

机构：

[1] Shanghai Univ Engn Sci, Coll Chem & Chem Engn, Res Ctr Adv Mirco & Nanofabricat Mat, Shanghai 201620, Peoples R China

[2] Natl Univ Def Technol, Sci & Technol Adv Ceram Fibers & Composites Lab, Changsha 410073, Peoples R China

[3] Donghua Univ, Key Lab High Performance Fibers & Prod, Minist Educ, Shanghai 201620, Peoples R China

来源：

POLYMER TESTING | 2023年 / 129卷

关键词：

PBAT; Low field nuclear magnetic resonance; Thermo-oxidative degradation; Molecular weight; SPIN-SPIN RELAXATION; WATER DYNAMICS; NMR; CHROMATOGRAPHY; POLYMER; RUBBER;

D O I：

10.1016/j.polymertesting.2023.108256

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The molecular weight is an important indicator for assessing the aging of polymers. However, existing methods for characterizing the molecular weight of polymers involve complex procedures and destructive tests. Therefore, efficient, rapid, and non-destructive testing methods would be a key development in material degradability evaluation. In this paper, we studied the thermo-oxidative aging process of polybutylene adipate terephthalate (PBAT) using a low-field nuclear magnetic resonance (LF-NMR) analysis method. The degradation mechanism of PBAT during thermo-oxidative aging is characterized by its low-field nuclear magnetic resonance decay curve and inversion curve. A two-component LF-NMR fitting analysis reveals that the thermo-oxidative degradation of PBAT conforms to a random fracture mechanism. Furthermore, a correlation between number average molecular weight and LF-NMR relaxation time during thermo-oxidative degradation of PBAT was constructed, with a correlation coefficient R2 greater than 0.97. The error between the correlation equation used in the molecular weight detection of PBAT and the actual test is less than 10%, indicating that it is feasible and reliable to characterize the number average molecular weight of materials by applying the LF-NMR relaxation time.

引用

页数：6

共 33 条

[1] Biodegradation of Biodegradable Polymers in Mesophilic Aerobic Environments [J].

Bher, Anibal ;

Mayekar, Pooja C. ;

Auras, Rafael A. ;

Schvezov, Carlos E. .

INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES, 2022, 23 (20)

[2] Characterization of Low-Molecular-Weight PLA using HPLC [J].

Codari, Fabio ;

Moscatelli, Davide ;

Storti, Giuseppe ;

Morbidelli, Massimo .

MACROMOLECULAR MATERIALS AND ENGINEERING, 2010, 295 (01) :58-66

[3] NMR spin-spin relaxation studies of silicate-filled low molecular weight poly(dimethylsiloxane)s [J].

Cosgrove, T ;

Roberts, C ;

Garasanin, T ;

Schmidt, RG ;

Gordon, GV .

LANGMUIR, 2002, 18 (26) :10080-10085

[4] Synthesis, Properties and Applications of Biodegradable Polymers Derived from Diols and Dicarboxylic Acids: From Polyesters to Poly(ester amide)s [J].

Diaz, Angelica ;

Katsarava, Ramaz ;

Puiggali, Jordi .

INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES, 2014, 15 (05) :7064-7123

[5]

Fang Yang, 2007, Petrochemical Applications, P66

[6] Characterization of Urea-Formaldehyde Resins by GPC/SEC and HPLC Techniques: Effect of Ageing [J].

Ferra, Joao M. ;

Mendes, Adelio M. ;

Costa, Mario Rui N. ;

Magalhaes, Fernao D. ;

Carvalho, Luisa H. .

JOURNAL OF ADHESION SCIENCE AND TECHNOLOGY, 2010, 24 (8-10) :1535-1551

[7] Molecular weight determination of lignosulfonates by size-exclusion chromatography and multi-angle laser light scattering [J].

Fredheim, GE ;

Braaten, SM ;

Christensen, BE .

JOURNAL OF CHROMATOGRAPHY A, 2002, 942 (1-2) :191-199

[8] The Scaling Law between Molecular Mass and Diffusivity and its Influence on the Molecular Weight Distribution as Derived from a Stretched Exponential PGSTE NMR Response Curve [J].

Gong, Xiaoliang ;

Hansen, E. W. ;

Chen, Qun .

MACROMOLECULAR CHEMISTRY AND PHYSICS, 2012, 213 (23) :2464-2471

[9] Molecular Weight Distribution Characteristics (of a Polymer) Derived from a Stretched-Exponential PGSTE NMR Response FunctionuSimulation [J].

Gong, Xiaoliang ;

Hansen, Eddy W. ;

Chen, Qun .

MACROMOLECULAR CHEMISTRY AND PHYSICS, 2012, 213 (03) :278-284

[10] A Simple Access to the (Log/Normal) Molecular Weight Distribution Parameters of Polymers Using PGSTE NMR [J].

Gong, Xiaoliang ;

Hansen, Eddy W. ;

Chen, Qun .

MACROMOLECULAR CHEMISTRY AND PHYSICS, 2011, 212 (10) :1007-1015

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