Browsing by Author "Alahapperuma, KG"

Now showing 1 - 5 of 5

item: Conference-Full-text
Effect of nano-silver ions pumps on antimicrobial activity of ag-nps incorporated polymer-based food packings
(IEEE, 2022-07) Madhuwanthi, WADP; Dammage, DNS; Weragoda, SC; Alahapperuma, KG; Rathnayake, M; Adhikariwatte, V; Hemachandra, K
Use of Ag Np (silver nanoparticle) incorporated polymer films for industrial applications requires an essential understanding of the variations of antimicrobial strength according to the dispersion parameters. This study was carried out to investigate the particle size effect on the antimicrobial potency of Ag Np incorporated polymer films and to observe the antimicrobial activity of silver nanoparticle impregnated polymers due to the ion pumping ability of nanoparticles in to the medium. Experimental observations were analyzed based on the theoretical frameworks developed in the literature. The paper also provides the fundamental theoretical framework for practicing engineers to design products based on these materials. This enables the industrial applications of these types of materials.
item: Thesis-Abstract
Investigation of the technical properties of the tyre re-treading compund formulated with RSS/SCRAP rubber blends
Alahapperuma, KG; Subramanium, K; Edirisinghe, D
Due to higher demand of petroleum and petroleum based synthetic rubbers, the price of Ribbed Smoked Sheets (RSS) has been gone up. Therefore, local rubber industries, particularly re-treading tyre industry has started replacing RSS grade partly with a cheaper scrap grade of Natural Rubber (NR) in their re-treading tyre compounds, in arbitrary ratios without considering the quality of tyre treads. In the project work, the tyre re-treading compounds based on blends of (RSS) and scrap grade in different proportions are investigated to identify the most suitable blend for obtaining optimum technical properties. The first step of the study reveals that the blend having RSS and scrap rubber in the ratio 80 : 20 is the most suitable economical blend to obtain a balance of technical properties . To get the optimum technical properties of the re-treading tyre compounds, the amount of carbon black should be added separately into the two types of rubber and prepared in the form of master batches, prior to mixing the two types of rubber together. Different weight. ratios are used for the two portions and correspondingly different compounds are prepared. The second step of the project work reveals that the addition of carbon black-oil mix should be made separately into each grade of rubber (of the chosen formulation from the first step of the project work), preferably 80% by weight t~ RSS and 20% by weight to scrap rubber, for optimum quality tyre treads Further increase of carbon black in scrap rubber is observed to give deleterious effects on both, cure and vulcanisate properties, due to non uniform dispersion of carbon black in scrap, possibly due to higher loading of carbon black in scrap rubber
item: Conference-Full-text
Optimize Technical Properties with Master Batch Blends in RSS/Scrap Rubber Tire Retread Compounds
(IEEE, 2021-07) Alahapperuma, KG; Adhikariwatte, W; Rathnayake, M; Hemachandra, K
Nowadays, polymers as a group of materials have occupied in major areas of human lives. Natural rubber (NR) is a substitute for synthetic rubbers in majority of applications, and higher prices of petroleum-based products have resulted in higher cost involvements in NR rubber compounds. This has resulted in partial replacement of higher grade Ribbed Smoked Sheet (RSS) NR with lower grade scrap rubber in most of the rubber products, especially retreading tire compounds. In preparation of rubber mixes, usual practice is to mix both types of rubber together and added with carbon black, oil and other ingredients subsequently, according to an order. Aim of this study was to get optimum technical properties of a selected retreading tire compound of (80%) RSS and (20%) scrap rubber with the use of master batch preparations; i.e. the amount of carbon black was added separately into two types of blended rubber and mixed separately. The master batch mix design with 80% carbon black incorporated into RSS and 20% carbon black incorporated into scrap rubber showed a better balance of technical properties than the properties obtained with other master batch mix designs and also the normal mix design.
item: Conference-Full-text
Study of degradation behavior of ASA coated PVC roofing sheets
(IEEE, 2022) Udayanga, S; Weragoda, SC; Alahapperuma, KG; Rathnayake, M; Adhikariwatte, V; Hemachandra, K
Polyvinyl Chloride (PVC) based roofing sheets are widely used in industrial and domestic applications today. It is recognized that ultraviolet rays (UV) in sunlight (wavelengths between 280 nm and 400 nm) cause photodegradation of some organic materials including polymers. Therefore, studying the change in properties of PVC/Acrylonitrile Styrene Acrylate (ASA) roofing sheets due to weathering is essential for their successful application. From this study, it was attempted to study how photodegradation affects some properties like hardness and impact strength of the roofing sheet. It was evident from the UV exposure test data that prolonged exposure to UV radiation deteriorates the hardness and impact strength properties of the sheet. But no change in appearance was observed in both UV exposure test and accelerated weathering test.
item: Conference-Full-text
Synthesis & utilization of paddy husk carbon black (phcb) for rubber compounding
(IEEE, 2022-07) De Silva, C; Weragoda, SC; Wathsala, T; Alahapperuma, KG; chuloda.desilva@gmail.com; sampathw@uom.lk; kptwathsala1995@gmail.com; gayanthi111@yahoo.com; Rathnayake, M; Adhikariwatte, V; Hemachandra, K
This study describes a procedure in which a compound has been formed by pyrolyzed rice husk at high temperature and subsequent grinding, which is intended to be used as a substitutional filler for carbon black in natural rubber compounds. This process has been investigated in order to develop a better value addition for rice husk which is a material source that is abundantly available in rice cultivating countries including Sri Lanka. The study has investigated effects on rheological and curing behavior, strength and elongation, hardness and resilience when using rice husk carbon black (RHCB) compared to regular N330 carbon black. The results indicated that non-modified RHCB does not contribute to strength improvement, but it is non-detrimental on elasticity and resilience of the compound.