Mechanisms of Wood-Generated Formaldehyde Emission

这项提案寻求为设在弗吉尼亚理工学院的木质复合材料中心(WBC)提供资金。基础研究的资金申请由NSF批准的请愿书授权，NSF 10-601。征集邀请研究所/大学合作研究中心提交支持行业定义的基础研究的建议。美国政府将很快限制部分木质复合材料的甲醛排放，但水平非常接近实木的自然排放量。这些本土排放的记录很少，也不被理解。WBC行业成员建议，必须确定本地排放的化学成分，这一知识将塑造改进粘合剂技术并最终控制总排放的努力。这项基础研究项目是对现有WBC项目的补充，并提供了现有中心资源无法提供的科学基础。在拟议的工作中，松木和杨木的木素化学将使用硫代酸解/脱硫(T/D)来定义。新鲜收获的木材将作为干燥变量的函数进行分析，已知的木质素-甲醛形成的化学标记物将通过T/D进行量化。这些化学标记物的出现将与水可提取的内源木材甲醛相关。这些发现将与目前的WBC甲醛项目中确定的气体自然排放相关联。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。有了本地排放的分子基础知识，该行业可以最好地设计出减少胶粘剂和木材的总甲醛排放的技术。因此，房主将有动力保持对廉价和可持续森林产品的偏好，同时获得减少甲醛排放的额外保证。这项工作还将有助于木质素化学的基础知识和新分析方法的开发。

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.