Question:
The cross linked polyethylene have better/higher properties than poly ethylene.
A. Heat resistant
B. Solubility
C. Tg
D. Processibity
E. Impact strength
Choose the correct answer from the options given below:
The cross linked polyethylene have better/higher properties than poly ethylene.
A. Heat resistant
B. Solubility
C. Tg
D. Processibity
E. Impact strength
Choose the correct answer from the options given below:
A. Heat resistant
B. Solubility
C. Tg
D. Processibity
E. Impact strength
Choose the correct answer from the options given below:
Show Hint
Cross-linking makes a polymer "tougher and hotter" but "harder to move." Use it for pipes that carry hot water where you don't want them melting or dissolving!
Updated On: May 20, 2026
- A and E Only
- A, C and E Only
- A and C Only
- B and D Only
Show Solution
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The Correct Option is B
Solution and Explanation
Concept:
Cross-linking (PEX) transforms linear polyethylene into a 3D network. This structural change significantly alters its mechanical and thermal performance.
Step 1: Analyze the impact of cross-linking.
• A (Heat Resistance): Correct. The network structure prevents the polymer from melting and flowing at high temperatures.
• C (Tg): Correct. Restricting chain movement via cross-links increases the glass transition temperature ($T_g$).
• E (Impact Strength): Correct. The interconnected network can absorb more energy before failing.
• Statement B: Incorrect. Cross-linking decreases solubility; PEX will swell but not dissolve.
• Statement D: Incorrect. Once cross-linked, it cannot be melted and reshaped, making processing much more difficult.
Step 1: Analyze the impact of cross-linking.
• A (Heat Resistance): Correct. The network structure prevents the polymer from melting and flowing at high temperatures.
• C (Tg): Correct. Restricting chain movement via cross-links increases the glass transition temperature ($T_g$).
• E (Impact Strength): Correct. The interconnected network can absorb more energy before failing.
• Statement B: Incorrect. Cross-linking decreases solubility; PEX will swell but not dissolve.
• Statement D: Incorrect. Once cross-linked, it cannot be melted and reshaped, making processing much more difficult.
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