A study of pine resin in softwood by 1D and 2D time-domain NMR
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Gao Xin
Abstract
Time-domain nuclear magnetic resonance (TD-NMR) is widely used in the investigation of wood-water relationship. However, some ambiguities between the NMR signals and the components in wood remain unresolved, particularly the effect of pine resin on NMR signals. To clarify these ambiguities and increase the use of TD-NMR in wood research, different sample treatment methods were studied, including air-drying, low-temperature vacuum-drying, diethyl ether extraction and moisture isothermal adsorption. The corresponding one-dimensional (1D) T1, T2 and two-dimensional (2D) T1-T2 correlation relaxation time distributions of radiata pine and Douglas fir samples were investigated. The NMR signals accounted for “longer relaxation-time components” below the fiber saturation point (FSP), but overlaped in parts of the 1D relaxation time distributions making it difficult to distinguish between pine resin and moisture. The 2D T1-T2 correlation relaxation time distributions produced a better distinction between pine resin and bound water. This distinction established a quantitative relationship between pine resin, moisture and 2D NMR signal amplitudes.
Research funding: This study was supported by the Fundamental Research Funds for the Central Non-profit Research Institution of CAF (CAFYBB2018QA001).
Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Employment or leadership: None declared.
Honorarium: None declared.
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Articles in the same Issue
- Frontmatter
- Review
- Timber moisture content adjustment factors for nondestructive testing (NDT): acoustic, vibration and probing techniques
- Original articles
- The morphological characteristics and classification of vascular parenchyma cells in bamboo, Phyllostachys edulis (Carr.) J. Houz
- A study of pine resin in softwood by 1D and 2D time-domain NMR
- Changes in the wood-water interactions of mahogany wood due to heat treatment
- Reaction kinetics investigation in relation to the influence of humidity on fatigue behavior of wood lap joints
- Effect of antisolvents on the structure of regenerated cellulose: development of an efficient regeneration process
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Articles in the same Issue
- Frontmatter
- Review
- Timber moisture content adjustment factors for nondestructive testing (NDT): acoustic, vibration and probing techniques
- Original articles
- The morphological characteristics and classification of vascular parenchyma cells in bamboo, Phyllostachys edulis (Carr.) J. Houz
- A study of pine resin in softwood by 1D and 2D time-domain NMR
- Changes in the wood-water interactions of mahogany wood due to heat treatment
- Reaction kinetics investigation in relation to the influence of humidity on fatigue behavior of wood lap joints
- Effect of antisolvents on the structure of regenerated cellulose: development of an efficient regeneration process
- The effects of pH on copper leaching from wood treated with copper amine-based preservatives
- Short note
- Micromechanical properties of beech cell wall measured by micropillar compression test and nanoindentation mapping
