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Polymer Degradation Causes
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Flashcards
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Chemical Degradation
Cause: Acids, bases, solvents, Affected Polymers: Polyamide, Nylon, Prevention Methods: Chemical resistant materials, proper storage.
Hydrolytic Degradation
Cause: Moisture/Water, Affected Polymers: Polyesters, Polycarbonates, Prevention Methods: Hydrophobic coatings, moisture barriers.
Photo-degradation
Cause: UV radiation, Affected Polymers: Polyethylene, PVC, Prevention Methods: UV stabilizers, antioxidants.
Mechanical Degradation
Cause: Wear and tear, Affected Polymers: TPEs, UHMWPE, Prevention Methods: Toughening agents, design modifications.
Oxidative Degradation
Cause: Oxygen and ozone, Affected Polymers: Rubbers, Polyolefins, Prevention Methods: Antioxidants, proper storage conditions.
Radiative Degradation
Cause: Ionizing radiation (e.g., gamma rays), Affected Polymers: Polyethylene, Polystyrene, Prevention Methods: Radiation stabilizers, proper shielding.
Biodegradation
Cause: Microbial activity, Affected Polymers: Biodegradable polymers like PLA, Prevention Methods: Antimicrobial additives, proper disposal.
Environmental Stress Cracking
Cause: Simultaneous action of stress and environmental factors, Affected Polymers: Polycarbonate, PVC, Prevention Methods: Proper material selection, stress reduction.
Thermo-oxidative Degradation
Cause: Combination of heat and oxygen, Affected Polymers: Polyurethane, Polyethylene, Prevention Methods: Thermal and oxidative stabilizers.
Thermal Degradation
Cause: Heat exposure, Affected Polymers: Polystyrene, Polypropylene, Prevention Methods: Use of heat stabilizers, proper storage conditions.
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