CHM 585 / 490 Chapter 11

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CHM 585 / 490Chapter 11

• Blends

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Chapter 11 Blends

• PPO
• Xenoy

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PPO

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PPO

• Tg 210C
• Impossible to process
• Brittle

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Miscible Blend

• Addition of HIPS imparts
• Flow
• Lowers Tg to a manageable level
• Impact

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Miscible blends have a single Tg
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Immiscible Blend
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PC / PBT

• PC brings toughness / impact
• PBT brings solvent resistance, heat resistance
• PC Tg 155C
• PBT Tg about 35C melting point 220C
• Good blend has two Tgs and sharp melting point

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But
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PC / PBT Disaster Blends

• Variability
• Terrible heat properties
• Poor solvent resistance
• Terrible processing in injection molding

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Xenoy
Ti(OR)4 P(OR)3 ????
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Xenoy
Trick seemed to be blending at 50ºC for 4 hours???
Ti(OR)4 P(OR)3 ????
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