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Studies on corn starch filled poly (styrene-co-butyl acrylate) latex reinforced polyester nonwoven fabric composites

Satheesh Kumar M. N., Siddaramaiah

Autex Research Journal

2005

Vol. 5, no. 4

228--235

Poly (styrene-co-butyl acrylate) latex was prepared with a 70:30 weight ratio of styrene to butyl acrylate. Various weight percentages of cornstarch were incorporated into the prepared copolymer latex. Polyester nonwoven fabric reinforced-cornstarch-filled copolymer latex composites were manufactured by the impregnation method. The pickup ratio of latex to fabric was maintained at 3.2:1. The composites' physico-mechanical properties, percent water absorption and percent thickness swelling were studied. The manufactured cornstarch-filled composites were evaluated for their ability to retain their shape after being moulded to the desired shape by measuring the percentage area, shape retention, hardness and resilience. It was observed that the manufactured thermoplastic composite specimens retained or increased their mechanical properties up to 20 wt% cornstarch loading.

Badania powłoki Al-Si na rurach, przeznaczonych na układy wydechowe

Nowak S., Żaba K., Kąc S., Starzykowski S., Mazur R.

Rudy i Metale Nieżelazne

2004

R. 49, nr 10-11

551-556

Przedstawiono wyniki badań, zrealizowanych w ramach prac nad wdrożeniem i doskonaleniem technologii produkcji zgrzewanych rur stalowych z powłoką Al-Si, przeznaczonych na elementy układów wydechowych. Badania powłoki obejmowały jej grubość, mikrogeometrię powierzchni, odporność na cykle cieplne i odkształcenie. Prezentowane są wyniki badań ewolucji stanu powłoki, poddanej działaniu wysokiej temperatury w różnym czasie.

The paper presents results of tests of Al-Si coats thickness, corrosion resistance, stability to heat and time, results of tests of evolution of condition of the coat in production processes and during operation of exhaust systems are also presented. The coat was evaluated on the basis of heat cycle tests results, measurement of thickness and micro-geometry of the surface, corrosion resistance, heat and time stability. A normalized heat cycle test consisting in multiple heating and sudden cooling of a sample was performed. Condition of the coat was evaluated. Measurements of thickness and micro-geometry of coats on sheets from various suppliers. Action of increased temperature and time were tested in view to find out what impact conditions of a welding processes have on coat conditions and what effect has the increased temperature during operation. To answer the first question we observed samples after welding and performed simulation tests. The samples were heated to defined temperature and structural effects and changes in chemical composition were observed. Heating temperature was defined on the basis of specially designed measurements of thermal field in the weld zone. To this end we used a thermovision camera. The second question was answered on the basis of tests consisting in heating samples in various temperatures (150-800 degrees centigrade) in varied time (3-168 h), and observation of coats and degree of diffusion of the components. Further, the heated samples with coats were tested by rolling, multiple bending and expanding. The coat in the weld zone, in the path which appeared after the flush was removed, was made up with thermal-mechanical method, making used of dynamics of exhaust gas stream in a acetylene blowpipe (spraying). Conclusions include proposal to introduce an operation of removing the coat from strip edges before forming a slit tube and using Al-Si coat instead of pure aluminium after the operation of flush removal.