There are many factors that potentially influence the bond strength of orthodontic attachments to composite resin surfaces such as the type of composite resin, the film thickness of adhesive resin, moisture, contamination, the dimension and geometry of the bracket base, storage conditions, aging of the composite, and method of testing [5 8].
Several factors limit the broad commercial application of bast fibers in composites, including: (i) variability of fiber properties, (ii) their poor adhesion with conventional resins, (iii) moisture absorption by natural fibers and (iv) cost of production, especially as this relates to extraction of high-quality fibers.
Whereas in early studies the amount of resins, wax, moisture and insoluble material was considered a good indication of sample quality, soon the identification and/or quantification of a class of compounds, such as flavonoids or phenolics, became necessary.
The results indicate that resin type and moisture content have significant influence on the mechanical properties while resin content is the least significant.
On the other hand, for physical properties resin content and moisture content have much lesser influence as compared to resin type.
There are two main categories of reactions in hygrothermal aging: the first one is the post curing process, which leads to a larger crosslinking density and a reduced interior stress; while the other is the plasticization and deterioration of epoxy resin attributed to moisture ingress.
Their leaves are glossy with oils and resins that seal in moisture during hot dry periods and serve the dual purpose of responding explosively to flame.
Mr. Fields carefully dabbed a moisture-resistant resin on each item in the tub as Ms. Sze delicately threaded one more strand of red string through her found-object universe, a last task before the tub -- one of a series of three in a work she called "Grow or Die" -- was to be lowered into a hole in the conservatory's brick floor and sealed under glass.
The effects of different factors including resin type, resin content and moisture content on the physicomechanical properties of medium density fibreboard (MDF) panels made from kenaf (Hibiscus cannabinus L). bast fibres are investigated.
However, the need for higher moisture content and resin load compared to those of softwood particleboard need to be addressed further to achieve an economically feasible product.
Commercial ground wheat straw was used in a full factorial experimental design to examine the effects of three processing variables (initial straw moisture content (MC), resin binder content (BC), and press temperature) on strawboard physical and mechanical properties.
