Addition polymerisation: thermoplastics
- relative movement on heating- softens at 60-100 C and stiffens on cooling
- range from hard and rigid to soft and pliable but all subject to creep and have a low elastic modulus
- generally unsuitable for load bearing
- do not rot or corrode or absorb water
Condensation polymerisation: thermosetts
- cannot be softened by heat
- rigid and hard
- insoluble in organic materials
- do not rot or corrode or absorb water
- sunlight may fade colour
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