[1] Nnamdi Azikiwe Univ, Fac Engn, Dept Polymer Engn, Awka, Anambra State, Nigeria
[2] Nnamdi Azikiwe Univ, Fac Engn, Dept Chem Engn, Awka, Anambra State, Nigeria
[3] Clemson Univ, Dept Ind Engn, Clemson, SC 29631 USA
[4] Ebonyi State Univ, Dept Technol & Vocat Educ, Abakaliki, Ebonyi State, Nigeria