KIBU2023-03-292023-03-292022-11-18http://erepository.kibu.ac.ke/handle/123456789/9067SPM 412:Polymers 1enAttribution-NonCommercial-ShareAlike 3.0 United Stateshttp://creativecommons.org/licenses/by-nc-sa/3.0/us/SPM 412:Polymers 1SPM 412Polymers 1Other