生漆成膜的分子机理

生漆是由漆酚、漆酶、树胶质、糖蛋白以及水分、金属离子等组成的非水相微乳系统,漆酚是其非水相介质,疏水性的糖蛋白自组装成反相微乳球形胶团的外壳,水分子、亲水性多糖、漆酶及金属离子聚集其内形成"微水池",漆酶是其生物催化剂。生漆的成膜过程由酶促起始,是一个典型的生物化学反应过程。漆酚在漆酶的催化作用下形成漆酚自由基,其后发生随机的非酶促自由基氧化反应,漆酚的二聚反应是其最重要的基元反应,漆酚侧链双键的自动氧化反应与其相偶联,聚合成结构单元间以-C-C-或-C-O-连接的无轨漆酚高聚体,最后再通过漆酚-多糖-糖蛋白的超分子化学作用,聚集成具有超耐久性、生物活性、磨光性、葆光性、抗溶剂性、抗氧化性以及热力学稳定的、可光氧化降解等特性的超分子结构膜。

Molecular Mechanism of lacquer film forming

Lacquer is non-aqueous reaction natural coating that is made up of uruhsiol,laccase,gummy substance,glycoprotein,water and metal ions.Uruhsiol is non-aqueous medium.Hydrophobic glycoproteinself-assembles intoreverse microemulsion spherical shell of the micelles.Water,hydrophilic polysaccharide,laccase and metal ions gather inside it and forms micro pool.Laccase is biocatalyst.Lacquer film forming process is activated by enzyme,and is a typical biochemical reaction process.Uruhsiol becomes uruhsiol radicals by the catalysis of laccase,then random non-enzymatic free radical oxidation reaction occurs.The dimerization reaction of uruhsiol is the most important elementary reactions.Through the auto-oxidation reaction the uruhsiol side chain double bondscouple torandom uruhsiol high-polymer withstructural units of-C-C-or-C-O-.By the supramolecularchemical reaction ofuruhsiol-polysaccharide-glycoprotein,supramolecular structure membrane is formed,which has the properties of ultra-durability,biological activity,wear resistance,luster maintaining,solvent resistance,oxidation resistance,thermodynamic stabilityand photo-oxidation degradation etc.