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← ScienceWhich outcome occurs when high-energy radiation breaks covalent cross-links in polysiloxane polymers?
A)Increased material flexibility and elongation
B)Enhanced thermal stability at high temperatures
C)Improved resistance to chemical degradation
D)Reduced hardness and increased tackiness✓
💡 Explanation
When high-energy radiation breaks covalent cross-links, polymer chain scission predominates because of the high energy transfer, reducing the molecular weight and entanglement density. Therefore reduced hardness and increased tackiness result, rather than flexibility, thermal stability, or chemical resistance enhancements that require cross-linking.
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