Question

Melmoware are
A. Thermosetting
B. Thermoplastic
C. Both a and b
D. None of these

Answer 1

Hint: Melmoware (as per its name) is formed from melamine-formaldehyde resin, a polymer, which does not change or reverse its shape upon heating. It is used to make cooking vessels, plates, mixed with plastic to form plastic wares, and many more. If it is highly heated, then it starts to melt, like cooking in melamine vessels, making food poisonous to some extent.

Complete Step by Step Solution:
Thermoplastics are those polymers which on heating get soft and left over to cool it down so that no change in chemical properties takes place (chemical resistant). But when thermoplastic is again exposed to heating, it gets easily re-melt, can easily be cooled, and thus, can be used again and again for many purposes (can be recycled). Thermoplastic is used in shampoo and drinking bottles, sports equipment, food containers, and many more. These include PVC, nylon, Teflon, polyester, and many more.

Whereas thermosetting (thermoset) polymers are made up of long and complex polymers chains which on heating or when exposed to radiation do not degrade easily. In other words once thermosetting material is set into any shape, it will be rigid towards heat (heat resistors). Thus, it is difficult to degrade thermosetting polymers but once they degrade at very high temperatures, they will lose their property and cannot retain its property easily (cannot recycle). Thermosetting includes melamine, bakelite, polyester resin, fibreglass and many more.
Thus, the correct option is A.

Note: Thermosetting is liquid at initial state. These are heated once to mould it into any shape and size but once it is set it will show high resistivity toward heat and thus, does not allow any change or degrade on heating easily which is in case of melamine used to form malmowares.