Effect of heat treatment at mild temperatures on the composition and physico-chemical properties of Scots pine resin

IF 2.4 3区农林科学 Q1 FORESTRY

European Journal of Wood and Wood Products Pub Date : 2024-05-03 DOI:10.1007/s00107-024-02087-x

Errj Sansonetti, Dace Cirule, Edgars Kuka, Ingeborga Andersone, Bruno Andersons, Kristine Meile, Laima Vevere

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引用次数: 0

Abstract

A major function of resin in trees is to provide defense against external attacks by releasing the resin flow in the attacked or damaged area. Nonetheless, leakage of resin on the surface can have negative aesthetic and economic impacts on wood materials. The aim of this study was to investigate how heat treatment affects the physico-chemical properties of the resin of Pinus sylvestris L. to hinder exudation on wood surfaces during service. To reduce the fluidity of the resin, it is necessary to remove the volatile fraction of resin, and several studies have been carried out in this direction, providing useful information about this process. The results from thermal analyses (DSC, TGA) confirmed that heat treatment at mild temperatures, 80 °C, 90 °C and 100 °C had a positive effect on increasing the glass transition temperature T_g and that the T_g and the residual volatile content were strongly correlated. FTIR spectroscopy, before and after heat treatment, did not reveal major changes in chemical structure, while UHPLC-DAD-MS analysis revealed significant differences in the ratios of compounds, which are the result of possible chemical reactions, such as dehydrogenation, oxidation and isomerization.

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低温热处理对苏格兰松树树脂的成分和物理化学特性的影响

树木树脂的一个主要功能是通过释放受攻击或受损区域的树脂流来抵御外部攻击。然而，表面树脂的渗漏会对木质材料的美观和经济产生负面影响。本研究旨在探讨热处理如何影响欧洲赤松树脂的物理化学特性，以阻止其在使用过程中渗出到木材表面。为了降低树脂的流动性，有必要去除树脂中的挥发性成分，在这方面已经开展了多项研究，提供了有关这一过程的有用信息。热分析（DSC、TGA）的结果证实，在 80 ℃、90 ℃ 和 100 ℃ 等温和温度下进行热处理对提高玻璃化转变温度 Tg 有积极作用，而且 Tg 与残余挥发物含量密切相关。热处理前后的傅立叶变换红外光谱分析没有发现化学结构的重大变化，而超高压液相色谱-DAD-MS 分析则发现化合物的比例存在显著差异，这是可能发生脱氢、氧化和异构化等化学反应的结果。

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来源期刊

European Journal of Wood and Wood Products 工程技术-材料科学：纸与木材

CiteScore

5.40

自引率

3.80%

发文量

124

审稿时长

6.0 months

期刊介绍： European Journal of Wood and Wood Products reports on original research and new developments in the field of wood and wood products and their biological, chemical, physical as well as mechanical and technological properties, processes and uses. Subjects range from roundwood to wood based products, composite materials and structural applications, with related jointing techniques. Moreover, it deals with wood as a chemical raw material, source of energy as well as with inter-disciplinary aspects of environmental assessment and international markets. European Journal of Wood and Wood Products aims at promoting international scientific communication and transfer of new technologies from research into practice.