chemistry 2
- Created by: Evie
- Created on: 20-01-13 09:29
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- chemistry 2
- polymers
- thermosoftt
- no crosslinks - easy to melt
- individual tangled chains
- weak layers - slide over eachother
- thermosetting
- dont soften when heated
- strong crosslinks
- rigid structure
- thermosoftt
- nanoparticles
- 1-100nm across containing a few hundred atoms
- fullerenes - molecules of carbon
- nanoscience
- large surface area:volume ratio = make good catalysts
- stronger lighter building materials
- polyethene
- LD= low density polyethene
- heat ethene at 200 degrees at high temperatures
- HD = high density polyethene
- heat ethene at lower temperatures and pressure
- LD= low density polyethene
- smart materials
- nitinol = nickel and titanium
- cools = bend
- heat up = remembered shape
- nitinol = nickel and titanium
- polymers
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