Thermosetting plastics, Mechanical Engineering

Assignment Help:

Q. What do you mean by Thermosetting plastics?

This plastic undergoes a number of chemical changes on heating and cure to infusible and practically insoluble articles. The chemical change is not reversible thermosetting plastics do not soften on reheating and can not be reworked. They rather become harder due to completion of any left-over polymerization reaction. Eventually, at high temperatures, the useful properties of the plastic get destroyed. This is called degradation. The commonest thermosetting plastics are: alkyds, epoxides, polyesters, phenolics and urea.


Related Discussions:- Thermosetting plastics

Mechanism and machine, define frame of a machine. which link of the machine...

define frame of a machine. which link of the machine is known as frame?

Equipment for resistance welding-protection, EQUIPMENT FOR RESISTANCE WELDI...

EQUIPMENT FOR RESISTANCE WELDING-Protection A circuit breaker can be provided (this equipment can be rated for interrupted capacity) which will cater to a number of resistance

Explain the working and construction of universal joint, (a) Describe clear...

(a) Describe clearly the constructional details and operation of various rear axle drives with the engine placed at the front. Illustrate your answer with simple and neat sketch.

Carbon and graphite, Carbon and Graphite Both are excellent refractory...

Carbon and Graphite Both are excellent refractory materials but with good grace oxidize and thus are used merely either in neutral or reducing conditions. Graphite is more sta

Find out maximum bending stress induced in beam, Q. A beam made of C.I. hav...

Q. A beam made of C.I. having section of 50mm external diameter and 25 mm internal diameter is supported at 2 points 4 m apart. The beam carries concentrated load of 100N at the ce

Maximum permissible stress in belt, Maximum permissible stress in belt: ...

Maximum permissible stress in belt: Q: A belt 100mm wide and 8.0mm thick are transmitting power at belt speed of 160m/minute.  The angle of lap for smaller pulley is 165º an

Water vortex fountain, hi there there is many way to make the water vortex...

hi there there is many way to make the water vortex but am not sure how can we make the one like > (www.williampye.com/work/charybdis)

Plant maintenance, which book is prefferable for plant maintenance?

which book is prefferable for plant maintenance?

Find dmension of strongest rectangular beam, Q.   Find the dimension of str...

Q.   Find the dimension of strongest rectangular beam that can be cut out of log of 25 mm  diameter. Sol .: b 2 +  d 2 = 25 2 d 2 = 25 2 -  b 2 As M/I = σ/y; M =

#totto cycleitle.., for an otto cycle, compression ratio=8.5:1,air inlet=15...

for an otto cycle, compression ratio=8.5:1,air inlet=15degree celsius and pressure=101.3kpa, maximum cycle temperature= 1800degree celsius, what is temperature after compression,te

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd