DSC Phân tích nhiệt dành cho các sản phẩm nhựa

Differential Scanning Calorimeter


mple and reference in the

will calculate the calorie different

independent system : exothermic/endothermic
reaction.



Glass transition temp

Henergy for molecular
vibrate.
C
X



H
C
X



Semi-crystalline polymers

contain both amorphous

crystalline phases.

Properties dominated by both
Tg and Tm.
Semi-Crystalline

Semi-crystalline polymers can

Polymer

exhibit additional

crystallization during he


Tm








Temp.  Molecular crystal arrangement need energy
Time  Molecular crystal arrangement need time


With temperature increase, the molecular chain has

higher en

binding e

and beco
polymer
Factor  soft chain, symmetry, crystallinity, entropy….

Melting heat  the energy for melting crystal lattice (ΔHm)

Crystallinity calculation 
△Ho = △Hm － △ Hc

Cry. % = △Ho/115 = (


△Ho = △Hm -

△Hc



SSP  To form different type.
Crystal type  heat stable type (C1) & dynamic

With longer SSP time, C2 will transform to C1.

The crystal defect has lower Tm2.
With longer SSP, defect be mended, and Tm2

Crystal fragments has lower melting point (Tm2)
With longer SSP, fragments grow, and Tm2 draw


Cry

Tm2

crystal start


Reactor

20B01

20E01

25B01/02

H
25E01






Longer SSPtime: only single peak (melting point)
Longer SSPtime: high crystallinity (58.3%)

2 Cavity
29g PF

300.00°C at 20.00°C/min
Tc1

PF