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| OREL7240 | Effects of Weathering on Wood Structure | 3+0+0 | ECTS:7.5 | | Year / Semester | Spring Semester | | Level of Course | Third Cycle | | Status | Elective | | Department | DEPARTMENT of FOREST INDUSTRY ENGINEERING | | Prerequisites and co-requisites | None | | Mode of Delivery | Face to face, Lab work | | Contact Hours | 14 weeks - 3 hours of lectures per week | | Lecturer | Prof. Dr. Ali TEMİZ | | Co-Lecturer | Non | | Language of instruction | | | Professional practise ( internship ) | None | | | | The aim of the course: | | The main objectives of this course are to give some information about wood weathering and protection methods of wood against weathering factors |
| Programme Outcomes | CTPO | TOA | | Upon successful completion of the course, the students will be able to : | | | | PO - 1 : | Define and explain the wheathering factors | 1,2,3,4,6,10,12 | 1,2 | | PO - 2 : | Understand and explain the changes in wood structure caused by weathering | 3,5,7,10 | 1,2 | | PO - 3 : | Define the degredation mechanism of wood components caused by photodegredation | 1,2,3,5,9,10 | 1,2 | | PO - 4 : | Understand the color change caused by weathering | 1,2,3,8,9,10 | 1,2 | | PO - 5 : | Understand and expain the protection methods of wood against weathering | 1,2,3,8,10 | 1,2 | | CTPO : Contribution to programme outcomes, TOA :Type of assessment (1: written exam, 2: Oral exam, 3: Homework assignment, 4: Laboratory exercise/exam, 5: Seminar / presentation, 6: Term paper), PO : Learning Outcome | | |
| Effects of UV-lights, moisture, temperature, wind and atmosferic factors (oxygen, air pollutant gas etc.) on wood. Weathering effects on the chemical, physical and microscopic changes on wood structure. Photodegradation mechanism of wood. Formation of free radicals. Chromophoric groups and mechanism of colour changes on wood surface. Interactions between weathering factors and wood components and protection methods of wood against weathering. |
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| Course Syllabus | | Week | Subject | Related Notes / Files | | Week 1 | Introduction of physical and chemical properties of wood | | | Week 2 | Presentation on weathering factors | | | Week 3 | Chemistry of photo-degradation | | | Week 4 | Effect of lignin on photodegradation | | | Week 5 | Mechanism of color change in wood | | | Week 6 | Effect of wood components on changing of wood color | | | Week 7 | Effects of moisture and atmosferic factors on wood weathering | | | Week 8 | Effect of weathering on physical properties of wood | | | Week 9 | Mid-term exam | | | Week 10 | Changes of wood ultra-structure on weathering | | | Week 11 | Protection methods of wood against weathering factors | | | Week 12 | Wood preservatives and its chemistry used in outdoor conditions | | | Week 13 | Wood impregnation methods | | | Week 14 | Tests in laboratory and outdoor conditions | | | Week 15 | Test methods and used equipments | | | Week 16 | End-of-term exam | | | |
| 1 | Hon, D.N.S, Shiraishi, N. 2001; Wood and Cellulosic Chemistry, Marcel Dekker, USA | | | |
| 1 | Fengel, D. and Wegener, G., 1984; Wood Chemistry, Ultrastructure, Reactions. Walter De Gruyter, Berlin/Germany | | | 2 | Feist, W.C. and Hon, D.N.S., 1984; Chemistry of Weathering and Protection, The Chemistry of Solid Wood, American Chemical Society, 401-454. | | | 3 | Hon, D.N.S. and Feist, W.C., 1981; Free Radical Formation in Wood: The Role of Water, Wood Science, 14, 1, 41-48. | | | 4 | Liu, R., 1997; The Influence of Didecyldimethylammonium Chloride Treatment on Wood Weathering, Ph.D Thesis, The Univ. of British Colombia, Canada. | | | 5 | Kartal, S.N., 1992; Odunun Degredasyonunda Güneş Işığı ve Su Etkileri, İ.Ü Orman Fakültesi Dergisi, Seri B, 42, 1-2. | | | |
| Method of Assessment | | Type of assessment | Week No | Date | Duration (hours) | Weight (%) | | Mid-term exam | 9 | | 1 | 30 | | In-term studies (second mid-term exam) | 12 | | 1 | 15 | | Oral exam | 6
13 | | 0,3
0,3 | 5 | | End-of-term exam | 16 | | 1 | 50 | | |
| Student Work Load and its Distribution | | Type of work | Duration (hours pw) | No of weeks / Number of activity | Hours in total per term | | Yüz yüze eğitim | 3 | 14 | 42 | | Sınıf dışı çalışma | 7 | 14 | 98 | | Laboratuar çalışması | 3 | 2 | 6 | | Arasınav için hazırlık | 7 | 4 | 28 | | Arasınav | 1 | 1 | 1 | | Ödev | 4 | 2 | 8 | | Kısa sınav | 1 | 1 | 1 | | Dönem sonu sınavı için hazırlık | 9 | 4 | 36 | | Dönem sonu sınavı | 1 | 1 | 1 | | Total work load | | | 221 |
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