Comparative studies of nano- and micro-composite Materials Based on PVA

Osama Saber*^1,2 and Abdullah A. Al Jaafari¹

Physics Dept , Faculty of Science,  King Faisal University¹, Al-Hassa 31982,

P O Box1759, Kingdom of Saudi Arabia and

Egyptian petroleum Research Institute², Egypt

Abstract

Organic-inorganic nano-hybrid materials based on layered double hydroxides are a class of synthetic two-dimensional nano-structured materials whose structure can be described as nano-layered ordered material.  This study aims to prepare and compare between nano-composite and micro-composite materials based on poly vinyl alcohol (PVA) and nano-hybrid materials.  Nano-hybrid materials containing azo-compounds were used as filler for poly vinyl alcohol (PVA) to form composite materials.  Nano-hybrid materials containing azo-compounds in cis-form and trans-form are characterized and differentiated by X-ray diffraction (XRD) and thermal analyses (TG, DTG and DTA). X-ray diffraction patterns showed that the interlayer spacing of nano-hybrid materials containing azo-compounds in cis-form is 2.2 nm.  While XRD pattern of nano-hybrid material containing azo-compounds in trans-form showed that it has two interlayer spacing; 1.9 and 2.8 nm.  Thermal analyses (TG, DTG and DTA) revealed the presence of a complex system of supra-molecular host-guest interactions. 

Nano-hybrid materials containing azo-compounds in cis-form were used to prepare micro-composite materials.  In case of using nano-hybrid materials containing azo-compounds in trans-form, we have successfully prepared nano-composite materials.  Nano- and micro-composite materials were characterized by X-ray diffraction, UV-Visible absorption spectra, thermal analyses and scanning electron microscopy.  The results suggest that the thermal stability and UV-Visible absorption spectra of the nano-composite materials are higher than that of micro-composite materials.

Keywords: Nano-layered materials, Nano-hybrid materials, Nano-composite materials, Micro-composites materials and PVA

Corresponding author  contact:

Dr. Osama Saber Yehya Mohamed

King Faisal University, Faculty of Science,

Physics Dept , Nano-Lab

Al-Hassa 31982 , P O Box 1759,

Kingdom of Saudi Arabia

Tel: 0555892179

Fax:03-5886437

osamasy@yahoo.com