我国属于森林资源匮乏的国家，高附加值利用林木剩余物意义重大。本项目采用绿液辅助预处理等方法从林木剩余物中分离提取半纤维素，设计采用多种增塑剂研究半纤维素的成膜性；通过膜表面接枝聚合引入活性官能团，并以此为反应位点用长碳链斑鸠菊酸改性制备半纤维素基疏水性薄膜；研究模型单体丙烯酰胺、丙烯酸和马来酸酐在膜表面的接枝聚合及 XPS探针化合物在表面的键合；通过与蒙脱土等层状硅酸盐共混复合制备高阻隔性半纤维素基薄膜。通过对弹性模量、拉伸强度、断裂伸长率及氧气透过率、水蒸气透过率等的研究，阐明其力学性能和阻隔性能与结构的关系。本项目旨在提高木材的高效增值利用,为其在包装材料等多领域应用提供科学依据。

Efficient use of forest residues to produce energy and materials with high added value is of great significance worldwide. This is especially true for such countries as China that is short of forest resources. This project aims to the isolation of hemicelluloses from saw dust by using methods including green-liquor pretreatment. The green liquor pretreatment process with respect to hemicellulose yield and composition were optimized. ..In addition, we propose to prepare hemicellulose-based films with improved barrier properties under conditions of high humidity. To this end, films are to be prepared from solution cast of mixture of hemicellulose with addition of various plasticizers, i.e . glycol, xylitol and sorbital.The films will be subsequently subjected to surface modification via grafting of various monomers using either solvent-free vapor-phase photografting or electron beam-induced grafting. Hydrophobic modification of films is to be achieved by incorporating vernolic acid, a fatty acid with long carbon chain, onto modified surface having amino groups through an amide bond which is formed from the reaction of carboxyl of fatty acid and amino of the surface. ..Composite films will be prepared by using either spin coating or by casting mixture solution of hemicellulose and phyllosilicates in polystyrene petri dish. Water vapor transmission rate (WVTR) will be determined using an ASTM E-96 procedure. Oxygen transmission rate (OTR) will be measured on an oxygen permeation analyzer. Composite films will be transformed into dumbbell-shaped samples for measurements of mechanical properties by using an Instron universal tester. A correlation between barrier properties and structure of films is to be addressed. ..The overall and ultimate goal of the project is to develop methodologies for an efficient chemical valorization of forest residues for various applications including green food packing.