| Summary: | 碩士 === 中興大學 === 森林學系所 === 95 === The aims of this study were to analyze the fundamental properties of crude bamboo tar, bamboo tar and bamboo vinegar. Both clear bamboo vinegar and bamboo tar obtained from crude bamboo tar distillation under reduced pressure. The bamboo tar was as polyol and the PU coatings were prepared with different bamboo tar/castor oil weight ratios and various polyisocyanates. The fundamental proportions and decay resistance of PU films were also examined. In preparation of polyurethane foams, the crude bamboo tar and bamboo vinegar were as blowing agent and the fundamental properties and antifungal index of PU foams with different polyisocyanates, blowing agents and dosage of blowing agent were conducted in this study. Results indicated that the crude bamboo tar had the hydroxyl value of 35 and the acid value of 153; the bamboo tar had the hydroxyl value of 233 and the acid value of 24; the bamboo vinegar had hydroxyl value of 0 and the acid value of 87. According to GC-MS analysis, of crude bamboo tar the acidic compounds were the main fraction, with acetic acid being the main one. The main components of bamboo tar were phenolic compounds, with 2, 6-dimethoxyl phenol being the main one and followed by phenol. The bamboo vinegar had higher concentration of acid components in which acetic acid was identified as the main one. To apply the bamboo tar using as PU coatings materials, the PU coatings with bamboo tar/castor oil weight ratio of 60/40 had the best adhesion, weatherability, lightfastness, and tensile strength. Among various polyisocyanates, the PU coatings containing PMDI showed excellent film properties such as hardness, tensile strength and thermalability. Moreover, PU coatings prepared with bamboo tar/castor oil weight ratio of 60/40 and polyisocyanates such as PTDI or PMDI, respectively, had an excellent decay resistance. The PU foams made from crude bamboo tar and bamboo vinegar as blowing agent showed that the size of cell increased as dosage of blowing agent increasing. However, the specific gravity, compression strength and weight retention decreased when the dosage of blowing agent increasing. The PU foam containing crude bamboo tar of dosage of 9% had the best antifungal index for Cladosporium sp..
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