Polyurethane Resins

CHAPTER 2
LITERATURE REVIEW
Suhreta Husic, et al., (2005) In this paper two sequence of polyurethane resins were prepared using soypolol 204 original from soybean oil and petrochemical polyol jeffol G30-650. Polyurethane from soybean oil has better thermal, weather and oxidative stability, and can be used as a matrix primary phase in composite materials. The purpose of this study was to evaluate the mechanical properties of untreated E-glass fiber reinforced composite materials prepared with soybean oil-based polyurethanes resin on physical and mechanical properties. The result shows that mechanical properties like tensile strength and flexural strength, tensile modulus and flexural modulus of the Soypolyol based composite materials were similar with composites based on petrochemical polyol. But soy-based polyurethanes shows good thermal, oxidative and hydrolytic stability than that of the petrochemical based compposites, they can be a feasible substitute to the petrochemical urethane based matrix resins for composite materials [1].
Li-Ping Gao, et al., (2008) In

Polymer composites were fabricated by mixing PVA with (5, 10, 15, 20, 25, 30, 40 and 50) wt.% of egg shells powder by using a magnetic stirrer at temperature 900C for 4hr to obtain homogeneous solution then samples were prepared by casting techniques. Measurement of DC conductivity and coefficient of thermal conductivity were done as a function to wt. % of egg shells. Compressibility generally increases with increasing of eggshells up to 40 % and then decreases. The electrical conductivity increase as concentrations of egg shells increase up to 30 % then conductivity decreases at 40 % then increases slightly at 50 %. It was found that coefficient of thermal conductivity increases with increasing of egg shells up to 40 % then decreases