ADVANCED SILSESQUIOXANES BASED COMPOSITES: – SYNTHESIS AND CURE CHARACTERISTICS. 1Nidhin
Divakaran,
2Smitha
C
2 Sukumaran, R
1CNR,
Pravin,
2Prasanta
Kumar Behera
2PSCG/VSSC
VIT University, Correspondence: nidhin3990@gmail.com SYNTHESIS & CHARACTERIZATION OF TSP POSS
ABSTRACT • Mono Allyl Hepta Phenyl (MAHP) POSS, Trisilanol phenyl (TSP) POSS and silicone containing POSS in the main chain (Resinous POSS) were synthesized by hydrolysis followed by alkali/acid catalysed condensation of alkoxysilane.
R= Phenyl group
• MAHP & TSP POSS were incorporated separately into resinous POSS with different weight loadings and subsequently cured via condensation curing mechanism.
TGA-DTA: TSP POSS
[i] Effect of catalyst concentration on activation energy (ozawa method)
THEORETICAL PREDICTION OF CURE PROFILE
SchemeTSP POSS
• The cure characteristics of MAHP POSS nano composite was studied by thermal methods and evaluated the cure kinetics and the related activation parameters.
For complete curing at RT (30°C)- 8days (192hrs) is required.
TGA RESULTS FTIR Spectrum: TSP POSS
Chemical Incorporation of POSS
• Compared the thermal properties of MAHP and TSP POSS nano composites.
Physical Incorporation of POSS
SYNTHESIS AND CHARACTERIZATION OF RESINOUS POSS
INTRODUCTION SchemeResinous POSS
Polyhedral Oligomeric Silsesquioxanes (POSS) - nanosized cage-like molecule
Incorporation of nano sized POSS macromers into polymers •Enhanced Physical Properties of Polymers •Enhanced Fire retardation •Usage temperature greater than 400°C •Light Weight •Improved Mechanical Properties
FTIR Spectrum: Resinous POSS TGA-DTA: Resinous POSS
First stage decomposition temp.(°C) MAHP TSP
Second stage decomposition temp.(°C) MAHP TSP
Residue at 800°C (%)
Study the effect of POSS incorporation into a silicone polymer containing POSS structure in the main chain.
0wt%
250
250
573
573
84
84
10wt%
291
350
572
600
84.1
84
Investigate the effect of chemical and physical incorporation of POSS based nano composites.
20wt%
293
369
572
620
84.2
84
cure
kinetics
and
related
CURE MECHANISM Chemical Incorporation of POSS
SCOPE AND OBJECTIVES
Investigate the parameters.
POSS conc. Physical Incorporation of POSS
CONCLUSION
activation DETERMINING ACTIVATION ENERGY & ORDER OF THE REACTION
SYNTHESIS AND CHARACTERIZATION OF MAHP POSS
ACKNOWLEDGEMENTS Director VSSC Director ,CNR, VIT University. Analytical & Spectroscopy Division (ASD), VSSC.
MAHP TSP