Mechanisms of Wood-Generated Formaldehyde Emission

该提案旨在为位于弗吉尼亚理工学院的木基复合材料中心（WBC）提供资金。基础研究的资金申请由NSF批准的招标（NSF 10-601）授权。征集邀请I/UCRC提交支持行业定义的基础研究的提案。 美国政府将很快限制某些木材复合材料的甲醛排放量，但其水平非常接近实木的天然排放量。这些天然排放物的记录很少，也不了解。WBC行业成员建议，必须确定天然排放物的化学性质，这些知识将影响改进粘合剂技术并最终控制总排放量的努力。这个基础研究项目补充了现有的WBC项目，并提供了一个科学基础，不可能与目前的中心资源。在拟议的工作中，松树和白杨木材的木质素化学将被定义使用硫代酸解/脱硫（T/D）。新鲜收获的木材将作为干燥变量的函数进行分析，木质素-甲醛形成的已知化学标记物将通过T/D进行定量。这些化学标记物的出现将与水可提取的内源性木材甲醛相关。这些发现将与当前WBC甲醛项目中确定的天然气体排放量相关。在拟议的工作中，该计划的核心是开发先进和耐用的木质复合材料。了解了自然排放的分子基础后，工业界可以设计出最好的技术，减少粘合剂和木材的甲醛总排放量。因此，房主将有动力保持对廉价和可持续森林产品的偏好，同时增加减少甲醛排放的保证。这一努力也将有助于木质素化学的基础知识和新的分析方法的发展。

This proposal seeks funding for the Center for Wood Based Composites (WBC) located at the Virginia Tech Institute. Funding Requests for Fundamental Research are authorized by an NSF approved solicitation, NSF 10-601. The solicitation invites I/UCRCs to submit proposals for support of industry-defined fundamental research. The U.S. government will soon restrict formaldehyde emissions from select wood composite materials, but at levels very near the native emission of solid wood. These native emissions are poorly documented and not understood. WBC industry members suggest that the chemistry of native emissions must be determined, and that this knowledge will shape efforts to improve adhesive technologies and ultimately control total emissions. This Fundamental Research project complements an existing WBC project, and provides a scientific foundation not possible with current Center resources. In the proposed work, lignin chemistry of pine and aspen woods will be defined using thioacidolysis/desulphurization (T/D). Freshly harvested wood will be analyzed as a function of drying variables, and known chemical markers for lignin-formaldehyde formation will be quantified by T/D. The occurrence of these chemical markers will be correlated to water extractable endogenous wood formaldehyde. These findings will be correlated to gaseous native emissions as determined in the current WBC formaldehyde project. In the proposed work, central to the plan is the development of advanced and durable wood-based composite materials. With knowledge of the molecular basis of native emissions, the industry can best devise technologies that will reduce total formaldehyde emissions, from adhesive binder and wood. Consequently, home owners will be motivated to maintain preferences for inexpensive and sustainable forest products, while having the added assurance of reduced formaldehyde emission. This effort will also contribute to the fundamental knowledge of lignin chemistry and to the development of new analytical procedures.