Polyester reinforcement

Table 3-1 gives typical mechanical property data for four materials, the exact values of which are unimportant for this discussion. Aluminum and mild steel have been used as representative metals and polypropylene (PP) and glass fiber-TS polyester reinforced plastics (GRP) as representative plastics. Higher-performance types could have been selected for both the metals and plastics, but those in this table offer a fair comparison for the explanation being presented. 

POROMER1C. A term coined to describe the microporosity, air permeability, and water and abrasion resistance of natural and synthetic leather. The pores decrease in diameter from the inner surface to the outer and thus permit air and water vapor lo leave lire material while excluding water from the outside. Polyester-reinforced urethane resins have been used as leather substitutes with some success, primarily for shoe uppers. 

Polyester Reinforcement. The data in Tables I and II reveal the following ... 

Polyester- Reinforced Urethane 1937 H G G G G Compression molded over a wide temperature range For heavy-duty leather applications-industrial applications... 

Reinforced plastics first became commercially available in the 1940s. Unsaturated polyester reinforced with fibrous glass is the most widely used reinforced plastic today. Chopped glass mats are used for sheet moulding compounds (SMC), bulk moulding compounds (BMC) and hand lay-up composites. 

Table 5.30 Problem/fault vs. solution/correction of glass fiber/rs polyester reinforced plastic... 

Case II em< (Figure 6.15(b)) This might apply to a thermoset polyester reinforced with glass fibres. It can be analysed in a similar manner to the previous case. The details are left as an exercise for the reader (Problem 6.18). The result, as before, is two criteria for failure of the composite. They are ... 

Biodegradable composite materials are materials obtained from nature or by synthetic methods, whose chemical bonds can be cleaved by bacteria or other microorganisms present in the biosphere. Composites of biodegradable polyester can be classified as composites made of polyester reinforced by carbon and glass fibers, natural fibers, and degradable polymers. 

The structural members studied by the French group were trusses made of polyester reinforced by long uni directional glass fibres. These trusses are used as masts, either cantilevered or guyed. This latter situation, in which they are subjected to eccentric compression, was chosen and was simulated by compression tests in a hydraulic press. 

Cyglas Unsaturated polyesters reinforced or not American Cyanamid... 

Burgueno et al. [28] developed a cellular biocomposite from unsaturated polyester reinforced with natural and glass fibers by means of casting pressure. The authors compared the performance of the cellular biocomposite panel (biopanel), against conventional systems used for building and residential construction, named precast pre-stressed hollow core concrete slab (PC/PS HC slab), precast pre-stressed solid concrete slab (PC/PS solid slab), and oriented wood strand board insulated structural panel (ISP). Results showed that PC/PS HC supported 31% more pressure than the biopanel. However the biopanel effectively competes with the solid PC/PS slab and supports 72 % more pressure than the ISP board. In addition, the performance of the biopanel was also compared by means of allowable pressure with two commercial panels made of E-glass/vinylester sandwich Durashield and Composolite. The biopanel outperformed the Composolite by 28%, while the Durashield outperformed biopanel by 17%. This evaluation shows that cellular biocomposite panels can effectively compete with commercial E-glass panels. 

---