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Title: DEVELOPMENT OF A RUBBER-BASED PRODUCT USING A MIXTURE EXPERIMENT: A CHALLENGING CASE STUDY
Page Range: p.123-150
Author(s): Yahya Kaya; Piepel G F; Erdal Caniyilmaz
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Journal: Progress in Rubber, Plastics and Recycling Technology
Issue Year: prprt
Volume: 29
Issue No: No.3
Abstract
Many products used in daily life are made by blending two or more components. The properties of such products typically depend on the relative proportions of the components. Experimental design, modelling, and data analysis methods for mixture experiments provide for efficiently determining the component proportions that will yield a product with desired properties. This article presents a case study of the work performed to develop a new rubber formulation for an o-ring (a circular gasket) with requirements specified on 10 product properties. Each step of the study is discussed, including: 1) identifying the objective of the study and requirements for properties of the o-ring, 2) selecting the components to vary and specifying the component constraints, 3) constructing a mixture experiment design, 4) measuring the responses and assessing the data, 5) developing property-composition models, 6) selecting the new product formulation, and 7) confirming the selected formulation in manufacturing. The case study includes some challenging and new aspects, which are discussed in the article. 17 Refs.
Title: EFFECT OF FLY ASH AS FILLER IN RUBBER – A COMPREHENSIVE STUDY OF THE VULCANISATE PROPERTIES OF STYRENE-BUTADIENE RUBBER COMPOUNDS
Page Range: p.151-168
Author(s): Mridul Dasgupta; Saptarshi Kar; Saikat Das Gupta; Rabindra Mukhopadhyay; Abhijit Bandyopadhyay
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Journal: Progress in Rubber, Plastics and Recycling Technology
Issue Year: prprt
Volume: 29
Issue No: No.3
Abstract
The effect of fly ash as a filler for an ESBR-based compound was studied in the range 0-80 phr. Characterisation of fly ash, as received, revealed the abundance of 200 mesh size particles with an average diameter of 10 (mu)m; composition analysis showed the predominance of silica and alumina. The properties of ESBR compounds filled with fly ash particles of T200 mesh were compared with those of clay- and whiting-filled compounds. The cure rate index remained unchanged for fly ash throughout the range of loading studied here; clay showed a lower cure rate, and whiting showed a higher value than fly ash. The 300% modulus values did not show any improvement with increase in fly ash loading, the values being comparable with those for whiting and inferior to those for clay. Fly ash gives the lowest heat build-up and tan delta (at 70 degrees C) values among the three fillers under discussion. 26 Refs.
Title: CONTROLLABLE MICROWAVE-ASSISTED POLYCARBONATE WASTE CHEMICAL RECYCLING
Page Range: p.169-176
Author(s): Mir Mohammad Alavi Nikje; Askarzadeh M
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Journal: Progress in Rubber, Plastics and Recycling Technology
Issue Year: prprt
Volume: 29
Issue No: No.3
Abstract
A simple, convenient and novel method was developed for the recovery of bisphenol-A from polycarbonate wastes under microwave irradiation. In this study bisphenol-A was recovered at a 100% yield by using a mixture of glycerol/water as the green solvent and sodium hydroxide as the catalyst, respectively. This methodology can overcome the disadvantages existing in traditional methods such as long reaction times, high energy consumptions, use of harmful reagents and environmental problems, and is applicable to all types of polycarbonates. 18 Refs.
Title: MECHANICAL PROPERTIES OF THE COMPOSITE MATERIAL BASED ON MODIFIED SCRAP TIRES AND POLYMER BINDER
Page Range: p.177-187
Author(s): Plesuma R; Megne A; Mateusa-Krukle I; Malers L
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Journal: Progress in Rubber, Plastics and Recycling Technology
Issue Year: prprt
Volume: 29
Issue No: No.3
Abstract
The present work focuses on the investigation of the mechanical properties of the composite material composed of preliminary modified rubber crumb and a polymer binder. The modification of rubber crumb was realized by means of treatment with water or sulphuric acid, in order to change the degree of polymer crosslinking or to intensify adhesion interaction between rubber particles and polymer binder. The Shore C hardness, compressive stress at 10% deformation and compression modulus of elasticity, ultimate tensile strength and elongation at break of composite material, in correlation with its composition and adhesion between rubber and polymer binder were investigated. Obtained results show possibility of attaining significant changes in the mechanical properties of composite material by selected rubber crumb treatment methods, in correlation with the composite material composition. This gives additional opportunity for meaningful improvement of composite material production technology. 13 Refs.
