고분자, 5대 범용 플라스틱 (Big Five)
1. LDPE, low density polyethylene
2. HDPE, high density polyethylene
Polymerization : free radical chain polymerization
Morphology(LDPE) : highly amorphous (branched)
Morphology(HDPE) : highly crystalline (linear)
Melting temperature : 137℃
Glass transition temperature : -130 to -80℃
3. PP, polypropylene
Polymerization : Zieglar-Natta polymerization
Morphology(isotactic) : highly crystalline
Morphology(atactic) : highly amorphous
Melting temperature(isotactic) : 174℃
Glass transition temperature : -17℃
4. PS, polystyrene
Polymerization(atactic) : free radical chain polymerization
Polymerization(syndiotactic) : Ziegler-Natta polymerization
Morphology(atactic) : highly amorphous
Morphology(syndiotactic) : highly crystalline
Melting temperature(syndiotactic) : 270℃
Glass transition temperature : 100℃
5. PVC, poly(vinyl chloride)
Polymerization : free radical chain polymerization
Morphology : highly amorphous, ~11% crystallinity
Glass transition temperature: ~84℃
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