Moeel, Fatemeh (2013) Synthesis and determination characterizations of Phenol Resorcinol Formaldehyde resin (PRF). Masters thesis, university of zabol.
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Abstract
In this study for the synthesis of phenol-resorcinol formaldehyde resin (PRF), phenol, resorcinol and formaldehyde were used. This resin was synthesized in three mola ratios (P: R: F), (1: 0.57: 1), (1: 0.57: 1.5), (1: 0.57: 2). Species used in this experiment were Iranian beech, spruce and yew to measure shear strength. Samples were cut with dimensions of 3 × 25 × 115 mm. They were placed in the open air for a month until the moisture content reaches the humidity. For shear strength test on a flat surface of 25 × 25 mm of prepared wood samples, 120-150 grams per square meter synthetic adhesive was applied and glued the two pieces together. The shear strength test of the samples was taken in dry conditions, cold water immersion for 24 hours and immersion in boiling wate for 6 hours measured. The results show that in dry condition, the height shear strength belongs to the adhesive with the molar ratio of (P: R: F), (1: 0.57: 2) in dicer wood and the lowest belongs to the adhesive with the molar ratio of (P: R: F), (1: 0.57: 1) in poplar wood; in immersion conditions, the height shear strength belongs to the adhesive with the molar ratio of (P: R: F), (1: 0.57: 2) in beech wood and the lowest belongs to the adhesive with the molar ratio of (P: R: F), (1: 0.57: 1) in dicer wood. In general, the maximum shear strength of specimens of all species was in dry conditions and the least resistance was in the condition of immersion in cold water for 24 hours. In all three cases ( dry condition, 24 hour immersion in cold water, 6 hour immersion in boiling water) the shear strength increased with the increase of formaldehyde resins. According to the observations, we can say that the best adhesive is the one wit h molar ratio of (P: R: F), (1: 0.57: 2) and the best kind of wood is beech.
| Item Type: | Thesis (Masters) |
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| Uncontrolled Keywords: | Resorcinol, Phenol, shear strength, Formaldehyde, Resin, boiling water |
| Subjects: | T Technology > TS Manufactures |
| Depositing User: | admin admin1 admin2 |
| Date Deposited: | 06 Jun 2017 05:51 |
| Last Modified: | 06 Jun 2017 05:51 |
| URI: | http://eprints.uoz.ac.ir/id/eprint/1444 |
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