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Hafeez Ullah  - - - 
Top co-authors
Khairun Azizi Mohd Azizli

49 shared publications

Universiti Teknologi PETRONAS Bandar Seri Iskandar

Suriati Sufian

45 shared publications

Chemical Engineering Department, Universiti Teknologi PETRONAS, 32610 Bandar Seri Iskandar, Perak, Malaysia

M. Irfan Khan

11 shared publications

Universiti Teknologi PETRONAS

Aamir Sada Khan

1 shared publications

Publication Record
Distribution of Articles published per year 
(2014 - 2018)
Total number of journals
published in
Publications See all
Article 4 Reads 0 Citations Efficient Entrapment of Oxirane Ring Containing Compounds in Thermally Stable Poly(urea-formaldehyde) Polymer Shell Wall Hafeez Ullah, Khairun Azizi Mohd Azizli, Zakaria B. Man, Mok... Published: 01 January 2018
Polymer Science, Series B, doi: 10.1134/s1560090418010141
DOI See at publisher website
Article 0 Reads 0 Citations The Impact of Different Polydimethylsiloxane Core Materials on the Properties of Melamine Formaldehyde Microcapsules Hafeez Ullah, Khairun Azizi Mohd. Azizli, Zakaria Man, Muham... Published: 01 May 2016
Key Engineering Materials, doi: 10.4028/
DOI See at publisher website
Article 0 Reads 4 Citations The potential of microencapsulated self-healing materials for microcracks recovery in self-healing composite systems: A ... Hafeez Ullah, Khairun Azizi Mohd. Azizli, Zakaria B Man, Muk... Published: 08 January 2016
Polymer Reviews, doi: 10.1080/15583724.2015.1107098
DOI See at publisher website
Article 8 Reads 0 Citations Synthesis and Characterization of Urea-formaldehyde Microcapsules Containing Functionalized Polydimethylsiloxanes Hafeez Ullah, Khairun Azizli, Zakaria B. Man, Mokhtar B. Che... Published: 01 January 2016
Procedia Engineering, doi: 10.1016/j.proeng.2016.06.519
DOI See at publisher website ABS Show/hide abstract
Self-healing anticorrosive coatings require healing agents with hydrophobic properties and low glass transition temperature. Polydimethylsiloxanes are group of compounds with high degree of hydrophobicity and very low glass transition temperatures. The nature of functional group of core material highly affect the properties of resultant microcapsules. Therefore, in this work, three polydimethylsiloxanes with different functional groups were successfully encapsulated in urea-formaldehyde microcapsules for self-healing applications through oil-in-water (OIW) emulsion polymerization. The resultant microcapsules were analyzed via Fourier transformed Infrared spectroscopy (FT-IR) for structural confirmation, thermogravimetric analysis (TGA) for the thermal behaviour, scanning electron microscopy (SEM) for size and morphology, and electron dispersive spectroscopy (EDS) for the elemental composition. For OH and vinyl terminated PDMS, microcapsules had diameters in the range of 100 to 500 μm while for Epoxy terminated PDMS microcapsules diameters were in the range of 50 to 100 μm. Thermal degradation behaviour was also different for all kinds of microcapsules, showing that nature of core materials affect the properties of microcapsules.
Article 5 Reads 6 Citations Effects of Parameters on the Setting Time of Fly Ash Based Geopolymers Using Taguchi Method Ahmer Ali Siyal, Khairun Azizi Azizli, Zakaria Man, Hafeez U... Published: 01 January 2016
Procedia Engineering, doi: 10.1016/j.proeng.2016.06.624
DOI See at publisher website ABS Show/hide abstract
Geopolymers are the inorganic polymer materials possessing properties superior than the properties of conventional materials. Geopolymers are also environment friendly materials. This paper determines the effects of parameters such as silica to alumina (Si/Al) ratio, sodium to alumina (Na/Al) ratio, water to solid (W/S) ratio, and temperature on the setting of fly ash geopolymers. The experiments were designed using Taguchi model. The setting time was determined by Vicat Needle apparatus. The Si/Al - 2.2, Na/Al - 1.4, W/S - 0.30, and temperature of 40 °C increased the setting time and workability of the geopolymers. The Si/Al ratio of 1.8, Na/Al ratio of 1.0, W/S ratio of 0.20, and temperature of 80° C caused fast setting of geopolymers. The setting time of geopolymers can be optimized using Taguchi method for particular applications.
Article 0 Reads 0 Citations A Short Review of Infra-Red Spectroscopic Studies of Geopolymers Muhammad Irfan Khan, Khairun Azizi Azizli, Suriati Sufian, Z... Published: 01 January 2016
Advanced Materials Research, doi: 10.4028/
DOI See at publisher website