1.3 Enchancements Flashcards
What are the 10 polymer enchancements
Antioxidants, Antistatic, UV light stabilisers, Biodegradable plasticisers, Fillers, Flame retardant, Lubricant, Pigment, Plasticisers, Thermal antioxidants
What polymer enhancement is “reduce the deterioration of a polymer from exposure to oxygen in the air which can lead to brittleness, surface cracks and discolouration”
Antioxidants
What polymer enhancement is “reduce the build-up of static charge by improving electrical conductivity slightly which attracts moisture from the surroundings and helps prevent the build-up of dust and dirt on plastic parts with electrical internals.”
Anti statics
What polymer enhancement is “help prevent polymer molecular chains from breaking due to sunlight (UV energy). UV attack causes fading of colours or yellowing, brittleness and surface cracks”
UV light stabilisers
What polymer enhancement is “are used to speed up degradation times e.g. oxy-degradable additives added to carrier bags to ensure the bag disintegrates”
Biodegradable plasticisers
What polymer enhancement is “reduce the amount of polymer required (saving money) and some minerals e.g. chalk can increase the thermal conductivity of a polymer meaning it will heat up and cool down more quickly; which gives shorter mould cycle times (faster production rates)”
Fillers
What are the 3 wood preservatives types
Copper based, pigmented preservatives via pressure treatment, Cellulose based
What polymer enhancement is “are used to make plastics softer and more flexible e.g. PVC vs uPVC. Also useful in polymer production as they help to decrease the viscosity (aiding flow) and lower the polymer’s softening and melting temperatures”
plasticisers
What polymer enhancement is “reduce the likelihood of combustion or the spread of fire”
flame retardants
What polymer enhancement is “reduce the viscosity of molten polymer material to help it flow more easily and fill intricate mould cavities. They save energy/money compared to raising the temperature of molten polymer to reduce viscosity”
lubricant
What polymer enhancement is “are coloured particles that are mixed into a molten polymer to add colour”
pigment
What polymer enhancement is “help prevent a polymer oxidising or discolouration due to excessive heat when being processed”
thermal antioxidants
How does cellulose based wood enhancements enhance the wood
harder wood
What are the 3 SCLs (Structural composite lumbers)
Glulam, LVL (Laminated veneer lumber) , OSB (Oriented strand board)
What are the 4 adv of SCL’s
Greater stability, Defect free, Great length, greater strength than concrete