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Answer any three of the following: (i) Describe the main differences between natural rubber and synthetic rubber - Leaving Cert Engineering - Question b - 2021
Question b
Answer any three of the following: (i) Describe the main differences between natural rubber and synthetic rubber. (ii) Describe the manufacturing process of plasti... show full transcript
Worked Solution & Example Answer:Answer any three of the following: (i) Describe the main differences between natural rubber and synthetic rubber - Leaving Cert Engineering - Question b - 2021
Step 1
Describe the main differences between natural rubber and synthetic rubber.
Answer
Natural rubber is sourced from the sap of rubber trees (Hevea brasiliensis) and is known for its high tensile strength, flexibility, and resilience. It is biodegradable and exhibits excellent wear resistance. In contrast, synthetic rubber is produced through polymerization of various monomers and can be engineered for specific properties such as improved aging resistance and better weathering. Unlike natural rubber, synthetic rubber is often less resistant to heat and can be more vulnerable to UV degradation.
Step 2
Describe the manufacturing process of plastic pulsation shown below.
Answer
Plastic pulsation involves several key stages. Initially, materials are fed into a guide plate and pre-formed using a performing unit. The mixture, which has been impregnated with resin, is then passed through a resin bath to elevate its properties. Following this, the forming and curing die shapes the plastic, and the cut-off mechanism trims the excess. Finally, a pulling mechanism ensures a continuous feed of the completed product, enhancing the overall efficiency of the process.
Step 3
Outline two negative effects on the environment of petroleum-based polymer manufacture.
Answer
Firstly, the extraction and processing of petroleum for polymer production result in significant greenhouse gas emissions, contributing to climate change. Secondly, petroleum-based products are typically non-biodegradable, leading to long-term environmental pollution and posing challenges for waste management as these materials persist in landfills and ecosystems.