निम्नलिखित में से कौन-सा बहुलक, एक थर्मोप्लास्टिक नहीं है? Which of the following polymer is NOT a thermoplastic?
Verified Answer
A. टेफ्लान / Teflon
B. नियोप्रीन / Neoprene
C. पॉलिस्टीरीन / Polystyrene
D. पॉलिथीन / Polythene
Explanation:
Neoprene (polychloroprene) is a synthetic rubber that is a thermoset polymer. Once it is cured (vulcanized), it forms permanent cross-links and cannot be melted and reshaped, unlike thermoplastics such as Teflon, Polystyrene, and Polythene.