thermal analysis

Question 1

thermogravimetric analysis

Answer 1

thermoanalytic technique in which phy and chem properties of materials are measured as a func of increasing temp

Question 2

TGA thermogram

Answer 2

plot of mass against temperature which gives qual and quant info abt substance under study

Question 3

applications of TGA

Answer 3

1) chemical stability above an elevated temp
2) identification and purity det
3) decomposition mechanism
4) det of compsn of alloys and metals
5) amount of filler in a polymeric sample

Question 4

Limitations of TGA

Answer 4

1) limited to study of physical, chemical changes that can be followed by mass change
2) cannot be used for the study of fusion, crystalline transitions, glass transition and crystalline temp, solid state reactions with no volatile products

Question 5

Differential thermal analysis

Answer 5

thermoanalytic technique that can be used as a finger print for identification of materials

Question 6

DTA thermogram

Answer 6

plot of delta T= Ts-Tr versus the reference temp Tr

Question 7

Applications of DTA

Answer 7

1) identification
2) environmental studies
3) quality control
4) purity
5) generation of phase diagram and study of phase transitions