About: Polyester resin is a(n) research topic. Over the lifetime, 17163 publication(s) have been published within this topic receiving 101664 citation(s).
01 Aug 2003-Composites Science and Technology
Abstract: The degree of mechanical reinforcement that could be obtained by the introduction of glass fibres in biofibre (pineapple leaf fibre/sisal fibre) reinforced polyester composites has been assessed experimentally. Addition of relatively small amount of glass fibre to the pineapple leaf fibre and sisal fibre-reinforced polyester matrix enhanced the mechanical properties of the resulting hybrid composites. Different chemically modified sisal fibres have been used in addition to glass fibers as reinforcements in polyester matrix to enhance the mechanical properties of the resulting hybrid composites. The surface modification of sisal fibres such as alkali treatment produced optimum tensile and impact strengths, while cyanoethylation resulted in the maximum increase in flexural strength of the hybrid composites. It has been observed that water uptakes of hybrid composites are less than that of unhybridized composites. Scanning electron microscopic studies have been carried out to study the fibre-matrix adhesion.
01 Jun 2006-
Abstract: An electrophotographic photosensitive member capable of persistently exerting an effect of mitigating contact stress with contact members and excellent also in potential stability during repeated use is provided, and a process cartridge and an electrophotographic apparatus having the electrophotographic photosensitive member are provided. The charge transport layer serving as a surface layer of the electrophotographic photosensitive member contains a charge transporting material, polyester resin A containing a siloxane moiety and at least one of polyester resin C and polycarbonate resin D. The content of a siloxane moiety in polyester resin A is not less than 10% by mass and not more than 40% by mass relative to the total mass of polyester resin A. The charge transport layer has a matrix-domain structure having a matrix formed of the charge transporting material and at least one of polyester resin C and polycarbonate resin D and a domain formed of polyester resin A in the matrix.
01 Jul 2004-Composites Science and Technology
Abstract: Long and random hemp and kenaf fibres were used in the as-received condition and alkalized with a 0.06 M NaOH solution. They were combined with polyester resin and hot-pressed to form natural fibre composites. The mechanical properties of the composites were measured to observe the effect of fibre alignment and alkalization. A general trend was observed whereby alkalized and long fibre composites gave higher flexural modulus and flexural strength compared with composites made from as-received fibres. Alkalized long kenaf–polyester composites possessed superior mechanical properties to alkalized long hemp–polyester composites. For the hemp–polyester composites a high flexural modulus and a high flexural strength are associated with a low work of fracture. Scanning electron microscopy micrographs of the treated hemp and kenaf fibres showed the absence of surface impurities which were present on the untreated fibres. Apparent density measurements on hemp and kenaf fibres did not show a significant change after alkalization with 0.06 M NaOH. Wide endothermic peaks present in differential thermal analysis thermograms for all of the composites indicated the presence of moisture which leads to inferior mechanical properties. Dynamic mechanical thermal analysis carried out on the polyester matrix composites showed that the alkalized fibre composites have higher E ′ values corresponding to higher flexural moduli. Any correlation between fibre surface treatment and the work of fracture and tan δ of composites is less clear.
13 Sep 2001-
Abstract: The present invention provides a flame retardant resin composition excellent in impact resistance, heat resistance, dimensional stability, and flame retardance. That is, it provides a flame retardant resin composition comprising: 100 parts by weight of a thermoplastic resin (A) comprising: 80 to 10% by weight of (A-1) at least one of an aromatic polyester resin and a polyamide resin, 17 to 85% by weight of at least one of a rubber-containing copolymer of a vinyl cyanide and an aromatic vinyl (A-2) and a copolymer of a vinyl cyanide and an aromatic vinyl (A-3) and 3 to 40% by weight of (A-4) at least one of a polyphenylene ether resin and a polyphenylene sulfide resin, 1 to 60 parts by weight of a non-halogen, organic flame retardant (B) and 100 parts by weight or less of a filler (C).
01 Jul 2001-Composites Science and Technology
Abstract: Surface modifications of coir fibres involving alkali treatment, bleaching, and vinyl grafting are made in view of their use as reinforcing agents in general-purpose polyester resin matrix. The mechanical properties of composites like tensile, flexural and impact strength increase as a result of surface modification. Among all modifications, bleached (65°C) coir-polyester composites show better flexural strength (61.6 MPa) whereas 2% alkali-treated coir/polyester composites show significant improvement in tensile strength (26.80 MPa). Hybrid composites comprising glass fibre mat (7 wt.%), coir fibre mat (13 wt.%) and polyester resin matrix are prepared. Hybrid composites containing surface modified coir fibres show significant improvement in flexural strength. Water absorption studies of coir/polyester and hybrid composites show significant reduction in water absorption due to surface modifications of coir fibres. Scanning electron microscopy (SEM) investigations show that surface modifications improve the fibre/matrix adhesion.