Properties of hybrid polyurea-nitryle-urethanes
|Joanna Ryszkowska 1, Magdalena Jurczyk-Kowalska , Ewelina A. Zawadzak 1, Monika Bil 1, Marcin Jędrzejczyk 1|
1. Warsaw University of Technology, Faculty of Materials Science and Engineering (InMat), Wołoska 141, Warszawa 02-507, Poland
Polyurea-nitryle-urethanes (PUNU) are block copolymers containing soft and hard segments. Soft and hard segments of these polymers differ in polarity. At temperatures below 120oC polar hard segments typically do not mix homogeneously with less polar soft segments. As a consequence hard and soft domains are formed. Properties of PUNU such as: tensile strength, hardness, abrasive wear, chemical and thermal resistance are determined by parameters of synthesis process. Hard segments of hybrid polyurea-nitryle-urethanes are obtained with dicyandiamide (DCDA). DCDA is crystalline powder with diameter of particles higher than 0,05um. Dicyandiamide contains two amino groups and highly polar cyanimine group. The strong polar hard segments influence PUNU properties, especially high thermal stability. This polymers oxygen index is 36% (without antioxidants).
Presentation: poster at E-MRS Fall Meeting 2005, Symposium E, by Marcin Jędrzejczyk
See On-line Journal of E-MRS Fall Meeting 2005
Submitted: 2005-06-09 07:44 Revised: 2009-06-07 00:44