The curing process of polymeric diphenylmethane diisocyanate (pMDI) with wood is affected significantly by moisture in the wood since the reaction of isocyanate is highly sensitive to water. This study determined the curing kinetics of pMDI and wood mixtures containing various moisture contents by m
Effect of C/N ratio and moisture content on the composting of poplar wood
โ Scribed by Nishant Rao; Hans E. Grethlein; C. A. Reddy
- Publisher
- Springer Netherlands
- Year
- 1995
- Tongue
- English
- Weight
- 204 KB
- Volume
- 17
- Category
- Article
- ISSN
- 0141-5492
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โฆ Synopsis
Milled poplar wood (1.7 mm mesh size) was composted in lab-scale reactors. Initial C/N ratios were adjusted to 10:1, 30:1, and 50:1 using urea as the nitrogen source. At each C/N ratio, three moisture levels (30, 50, and 70%) were tested. C/N ratios of 50:1 or 30:1 and moisture content of 70% favored more effective composting as indicated by higher levels of mineralization of the poplar wood to CO2.
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The swelling rate of Engelmann spruce (Picea engelmannii Parry) in water was determined on cross sectional, quartersawn, and flatsawn samples. The rate of swelling from six initial moisture content levels to saturation was measured in both the tangential and radial directions. Internal restraints w
## SYNOPSIS A 99% "N-labeled polymeric diphenylmethane diisocyanate (pMDI) resin was used to make a series of wood/15N-pMDI composites at various wood precure moisture contents. Cure chemistry and bondline morphology was monitored using 15N CP/MAS (15N crosspolarization, magic-angle spinning) NMR
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