Geri dönüştürülmüş kestamidlerin mekanik özellikleri

Atmosfer koşullarında dökülebilme kabiliyetine sahip poliamid türü kestamid (döküm poliamid) olarak adlandırılmaktadır. Kestamidlerin ergime sıcaklıklarının poliamidlerin ergime sıcaklıklarına göre daha düşük olması nedeniyle kestamidler daha iyi dayanım ve tokluk değerlerine sahiptir. Gün geçtikçe artan kullanım alanına sahip olan kestamidlerin sodyum, magnezyum, katı ve ya sıvı yağ katkılı türleri mevcuttur. Bu çalışmada, yarı mamul kestamidden atölye koşullarında yeniden üretilen numunelerin mekanik özellikleri belirlenmiştir. Yarı mamul ve geri dönüştürülmüş numunelerin mekanik özellikleri ve nem emme kabiliyetleri karşılaştırılmıştır. Geri dönüştürülmüş kestamidde ortalama üniform uzama yarı mamule göre 30 kat azalırken, ortalama çekme dayanımı yarı mamulün ortalama çekme dayanımının %17.3’ü kadar olarak saptanmıştır.

Anahtar Kelimeler:

Kestamid, Döküm poliamid, Mekanik özellikler, Nem özellikleri

Mechanical properties of recyled cestamides

A kind of polyamide which can be obtained by casting in atmospheric conditions is called as cestamide (cast polyamide). Due to cestamides have a lower melting temperature compared to polyamides, cestamides have the values of better strength and toughness. Cestamides, which their usage areas are growing over time, have also other types including additives of sodium, magnesium, solid or liquid oil. In this study, the mechanical properties of samples reproduced from scrap cestamide at workshop conditions have been determined. The values of recycled samples have been compared with the results of experiments done for semi-finished. Recycled samples have lower mechanical properties to semi-finished samples. Average uniform stretching of recycled samples 30 times lower than cestamide semi-finished samples. Recycled samples have 17.3% tensile strength to semi-finished samples.

Keywords:

Cestamide, Cast polyamide, Mechanical properties, Humidity properties,

PDF

___

Crawford RJ. Plastics Engineering, 2nd ed. Oxford, UK, Pergamon Press, 1987.
Cowie JMG. Polymers: Chemistry & Physics of Modern Materials. 2nd ed. London, United Kingdom, Stanley Thornes Ltd, 1998.
Kohan MI. Nylon Plastics Handbook. Munich, Germany, Hanser Publication, 1995.
Samyn P, Baets PD, Schoukens G, Driessche IV. “Friction, wear and transfer of pure and internally lubricated cast polyamides at various testing scales”. Wear, 262(11-12), 1433-1449, 2007.
Callister DW. Materials Science and Engineering an Introduction. Wiley international edition, New York, USA, John Wiley & Sons Inc, 2002.
Kang SC, Chung DW. “The synthesis and frictional properties of lubricant-impregnated cast nylons”. Wear, 239(2), 244-250, 2000.
Kang SC, Chung DW. “Improvement of frictional properties and abrasive wear resistance of nylon/graphite composite by oil impregnation”. Wear, 254(1-2), 103-110, 2003.
Samyn P, Tuzolana TM. “Effect of test scale on the friction properties of pure and internal-lubricated cast polyamides at running-in”. Polymer Testing, 26(5), 660-675, 2007.
Yabe T, Takajo T, Kato S, Ueki F. “Lubricant-supplying properties and durability of oil-impregnated polymers”. Tribology Transmation, 43(3), 453-458, 2000.
Lin JX, Wang CY, Zheng YY. “Prediction of isothermal crystallization parameters in monomer cast nylon 6”. Computers and Chemical Engineering, 32(12), 3023-3029, 2008.
American Society of Testing and Materials. “Standard Test Method for Tensile Properties of Fiber-Resin Composite”. American Society of Testing and Materials, Philadelphia, USA, Re-Approved, ASTM Standard D 3039-76, 1982.