Polymer Journals

Applied Polymer Composites

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Title: MACROMOLECULAR MICRO COMPOSITES: FUNDAMENTALS AND A SYSTEM OF A BLEND OF POLYAMIDE-IMIDE / POLYETHERIMIDE
Page Range: p.1-16
Author(s): Sanjay Palsule; Kuldeep Nagar; Shyopat Ram; Himanshu Shekhar
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Journal: Applied Polymer Composites
Issue Year: apc
Volume: 2
Issue No: No. 1

Abstract
A new concept of a 'Macromolecular Micro Composite' is proposed as a melt processable and thermodynamically miscible blend of a flexible polymer and a quasi-rigid polymer in which the flexible polymer is molecularly reinforced by a quasi-rigid macromolecule offering synergistic properties and improved mechanical properties as compared to those of the constituent flexible polymer. Fundamentals are presented and the concept is established, herewith, by melt processing a miscible macromolecular micro composite of flexible polyetherimide reinforced by quasi rigid polyamide-imide with improved mechanical properties as compared to those of flexible polyether-imide. Advantages of macromolecular micro composites over molecular composites, self reinforced blends, and other molecularly reinforced polymer blends are discussed. 23 Refs.

Title: INFLUENCE OF MWCNTS AS SECONDARY REINFORCEMENT MATERIAL IN GLASS FIBER/EPOXY COMPOSITES FABRICATED USING VARTM
Page Range: p.17-26
Author(s): Saad Anas; Ghufran Ur Rehman; Zaffar Mohammad Khan; Noaman Ul-Haq; Muhammad Bilal Khan; Saad Nauman; Muhammad Shahid; Ali Nasir
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Journal: Applied Polymer Composites
Issue Year: apc
Volume: 2
Issue No: No. 1

Abstract
Effects of multi-walled carbon nano tubes (MWCNTs) - as secondary reinforcements - on tensile strength, fibre-matrix bonding and interaction with the coupling agent in glass fibre/epoxy composite have been reported. Composites have been fabricated by a lab scale vacuum assisted resin transfer moulding (VARTM) according to ASTM D-638 standard. Pristine CNTs are usually not so effective, but with the interaction of silane coated glass fabric, interfacial reinforcing between matrix and fibres has been found to take place and that increases the toughness as well as the tensile properties by enhancing the interfacial strength between the fabric and the matrix. The increase in tensile strength of about 27% was observed from experimental values using only 0.3% weight percent of CNTs in epoxy. FTIR analysis confirmed the Si-O-C linkage and SEM results showed good adhesion of fibres with matrix confirming the enhancement of interface. 21 Refs.

Title: OIL PALM MESOCARP PARTICLES REINFORCED CASHEW NUT SHELL NOVOLAC RESIN COMPOSITES
Page Range: p.27-36
Author(s): Obasi H C; Igwe I O; Onyeagoro G N; Obidiegwu M U; Anyanwu P I
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Journal: Applied Polymer Composites
Issue Year: apc
Volume: 2
Issue No: No. 1

Abstract
Oil palm mesocarp particle (OPMP) reinforced cashew nut shell Novolac resin (CNSR) composites (OPMP/CNSR) have been processed at different filler contents (0 to 25 wt%) and particle sizes (400 (mu)m, 500 (mu)m and 600 (mu)m). Both the amount of reinforcement and particle size influence the Young's modulus, tensile strength, elongation at break, flexural strength, flexural modulus, and water absorption of OPMP/CNSR composites. The optimum properties were observed at 20 wt% filler content and 400 (mu)m particle sizes. 23 Refs.

Title: OPTIMIZATION OF WHEAT STRAW FIBRES/PHENOL FORMALDEHYDE COMPOSITES
Page Range: p.37-44
Author(s): Mohit Kumar; Akhouri Sanjay Kumar Sinha
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Journal: Applied Polymer Composites
Issue Year: apc
Volume: 2
Issue No: No. 1

Abstract
Wheat straw fibres obtained by soda pulping process have been used to reinforce phenol formaldehyde resin to develop wheat straw fibre/phenol formaldehyde (WS/PF) composites. The optimisation of important process parameters like temperature, pressure, time and fibres percentage in the composites has been performed. The minimum and maximum process parameters have been worked out, and finally response surface methodology has been used to optimize the process conditions to get best properties of the WS/PF composite. The experimental design has variation range of temperature from 95oC to 195oC, pressure from 0 to 31 MPa, time from 15 to 82 minutes and weight percentage of wheat straw fibres from 10 to 100. The optimized results show good strength properties at 148oC temperature, 48 minutes time, 33.5 MPa pressure and 58 weight percent fibres in the composite. Density of the composite material has been found to vary from 1.25 to 1.38 gm/cm3. 13 Refs.

Title: ON THE DIFFERENCES BETWEEN CORD-RUBBER COMPOSITES AND FIBER REINFORCED POLYMER COMPOSITES
Page Range: p.45-58
Author(s): Gurvich M R
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Journal: Applied Polymer Composites
Issue Year: apc
Volume: 2
Issue No: No. 1

Abstract
Approaches and computational capabilities in structural modelling of cord-rubber composites (CRC) are often based on similar well established solutions for fibre reinforced polymer composites (FRP). Although there are many similarities between CRC and FRP, there are crucial distinctions in their structural behaviour and, therefore, in their modelling. This study presents a systematic review of these differences, aims to understand their nature, and provides their quantitative estimations for typical CRC materials. Major explanations of the differences are proposed. Among others, the following issues are discussed in detail: nonlinearity and incompressibility of matrix, relatively big size of cords, relatively low stiffness of rubber, and deformation mechanisms of laminated CRC. The differences are discussed at several scales of structural modelling: components, micro-mechanics of uni-directional CRC, macro-mechanics of CRC, and laminated CRC. Finally, representative numerical results are demonstrated for typical CRC materials to emphasize important observations and explain their impact on predictive accuracy and confidence. 17 Refs.

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