Assessing the thermal and fungal behavior of eco-friendly epoxy thermosets derived from vegetable oils for wood protective coatings

编号 020033001

推送时间 20220214

研究领域 林产化工 

年份 2022 

类型 期刊 

语种 英语

标题 Assessing the thermal and fungal behavior of eco-friendly epoxy thermosets derived from vegetable oils for wood protective coatings

来源期刊 Progress in Organic Coatings

期 第330期

发表时间 20220111

关键词 Biobased thermosets;  Epoxidized soybean oil;  Castor oil maleic anhydride adduct;  Thermal behavior;  Non-isothermal degradation kinetics;  Microbiological resistance; 

摘要       The paper deals with the study of the obtaining, characterization and thermal and fungal behavior of a green?thermoset?based on epoxidized soybean oil (ESO), castor oil?maleic anhydride?adduct (COMA) and methyl nadic anhydride (MNA). By varying the MNA/COMA crosslinking agent ratio, resins with different degree of stiffness can be obtained suitable for green thermosets coatings.?Differential scanning calorimetry?(DSC) and a simultaneous TG/FT-IR/MS coupling were used to establish the crosslinking behavior, evolved gases analysis and thermal decomposition mechanisms associated with their corresponding kinetic parameters. The non–isothermal global kinetic parameters values (activation energy and pre–exponential factor) were calculated with the aid of the Friedman and Flynn–Wall–Ozawa isoconversional methods. The curves shape of the variation of activation energy versus conversion degree and first derivative (DTG) curves shapes suggest that the?thermal degradation?processes occurred in multi-step kinetics. Using a multivariate linear regression method the most probable thermal decomposition and crosslinking kinetic models were established. A good concordance between experimental and simulated data was obtained, confirming the correct description of the thermal mechanisms. The main identified gaseous fragments were water, carbon dioxide, saturated and unsaturated hydrocarbons and carboxylic derivatives. The decay resistance against two wood decaying strains,?P. chrysogenum?and?A. brasiliensis?was also evaluated.

服务人员 尚玮姣

服务院士 宋湛谦

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