BCT465 Physical And Chemical Properties Of Cellulosic Materials UITM Assignment Sample Malaysia 

The BCT465 Physical and Chemical Properties of Cellulosic Materials course provides students with a comprehensive understanding of the physical and chemical properties of cellulosic materials. The course emphasizes theoretical knowledge and practical applications related to dimensional instability, permeability, thermal properties, sugar chemistry, and natural durability of cellulosic materials.

A strong grasp of these fundamental properties is essential for efficiently utilizing cellulosic materials in the production of bio-composite products. Additionally, it is crucial for students to comprehend the decay processes and protective measures required for cellulosic materials in the wood-based industry.

The BCT456 course also explores the impact of weathering and selected biological agents on the decay of cellulosic materials. Students will gain insights into the effects of natural weathering through graveyard tests, further enhancing their understanding of material deterioration and preservation techniques.

Overall, this course equips students with the knowledge and skills necessary to analyze and manipulate cellulosic materials effectively, enabling them to contribute to the development of sustainable and durable bio-composite products in various industries.

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AssignmentTask 1 : State, define and describe physical and chemical properties of cellulosic materials (LO1; C2; A2)

Cellulosic materials are natural materials derived from plants and are composed primarily of cellulose. Here are the definitions and descriptions of their physical and chemical properties:

Physical Properties:

•  Density: Cellulosic materials have relatively low densities, making them lightweight and easy to handle. 
• Porosity: These materials possess a porous structure, allowing for the absorption and release of moisture and gases.
•  Color: The color of cellulosic materials varies depending on their source, ranging from white (e.g., cotton) to yellowish (e.g., jute) or brown (e.g., wood). 
• Surface Texture: The surface texture can be smooth or rough, depending on the source and processing methods. 
• Mechanical Strength: Cellulosic materials exhibit varying degrees of mechanical strength, influenced by factors such as the cellulose source, processing, and inherent structure.

Chemical Properties: 

• Cellulose Content: Cellulosic materials are primarily composed of cellulose, a complex carbohydrate consisting of glucose units linked together. The cellulose content can range from 40% to 95%.
•  Moisture Absorption: Cellulosic materials have the ability to absorb and release moisture, leading to dimensional changes and affecting their properties. 
• Chemical Reactivity: Cellulosic materials can undergo chemical reactions such as hydrolysis, oxidation, and degradation when exposed to certain chemicals, heat, or biological agents.
•  Combustibility: Most cellulosic materials are combustible and can burn when exposed to a flame or high temperatures.
• Biodegradability: Due to the presence of cellulose, cellulosic materials are generally biodegradable, meaning they can be broken down by biological organisms over time.

AssignmentTask 2: Classify and explain the relationship between basic cellulosic material properties and dimensional instability, permeability, thermal and decay properties.( LO1; C5; A3)

• Dimensional Instability: Cellulosic materials can undergo dimensional changes due to their ability to absorb and release moisture. When exposed to moisture, they may swell or shrink, leading to dimensional instability.
• Permeability: The porous nature of cellulosic materials allows for the passage of gases and liquids. The permeability is influenced by factors such as pore size, distribution, and connectivity within the material’s structure.
• Thermal Properties: Cellulosic materials have moderate thermal conductivity, meaning they can transfer heat to some extent. However, their thermal stability varies depending on factors such as cellulose content, processing, and the presence of other compounds.
• Decay Properties: Cellulosic materials are susceptible to decay when exposed to certain environmental conditions, particularly when in contact with moisture, fungi, or insects. The rate of decay can depend on the material’s inherent properties and the surrounding environment.

The relationship between these properties and the specific characteristics of cellulosic materials is complex and can vary depending on factors such as the source of cellulose, processing methods, and environmental conditions.

Assignment Task 3 : Perform experiments and interpret results of physical and chemical cellulosic properties determination. (LO1,LO2,LO3-CTPS3,LO4-CS3;LO5-TS3;LO9-LS2; C3;P4; A4 )

Performing experiments to determine physical and chemical properties of cellulosic materials can provide valuable insights into their behavior and potential applications. Here are some examples of experiments and how to interpret the results:

1. Moisture Absorption: Measure the weight of a dry cellulosic sample, expose it to a controlled humidity environment, and monitor its weight gain over time. Interpretation: The rate and extent of moisture absorption can provide information about the material’s moisture sorption capacity and potential dimensional changes.
2. Mechanical Strength: Conduct tensile strength tests on cellulosic material samples using a universal testing machine. Interpretation: The maximum force the sample withstands before breaking indicates its tensile strength, which reflects the material’s mechanical integrity and durability.
3. Thermal Stability: Use thermogravimetric analysis (TGA) to measure the weight loss of a cellulosic sample as it is subjected to increasing temperatures. Interpretation: The temperature range and rate of weight loss can indicate the material’s thermal stability and degradation behavior.
4. Decay Resistance: Prepare cellulosic material samples and subject them to controlled decay tests by exposing them to fungi or insects. Monitor changes in weight, appearance, and structural integrity over time. Interpretation: The extent of weight loss, decay appearance, and damage can provide insights into the material’s resistance or susceptibility to decay organisms.

By conducting these experiments and interpreting the results, researchers and engineers can gain a deeper understanding of the physical and chemical properties of cellulosic materials, enabling informed decisions regarding their use in various applications.

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