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Structure and properties of rigid polyurethane foam damping material

Author: GuYuan
Tutor: LuoShiKai；ZhouQiuMing
School: Chinese Academy of Engineering Physics
Course: Weapons systems and the use of engineering
Keywords: Rigid polyurethane foam Damping properties A chain extender Polyether Glass beads Aperture
CLC: TQ323.8
Type: Master's thesis
Year: 2010
Downloads: 229
Quote: 1
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Abstract


The vibration and noise is not only harmful for the human auditory system , but also accelerate the aging of the mechanical structure , affecting the precision and service life of the equipment and instrumentation damping technology is a method to effectively control the vibration and noise . The polyurethane material can be adjusted due to the hard and soft segment ratio is widely used as a damping material . Rigid polyurethane foam is an excellent insulation and structural materials , but pay less attention to its damping performance . In this paper, molded foam technology , design and preparation of different types of rigid polyurethane foam by changing the formulation and process conditions , mechanical testing and dynamic mechanical properties test , discussed the relationship between the structure and properties of . The amount and type of chain extender on the material properties , the results showed that : the amount of chain extender is appropriate , the impact properties of the material and the compression performance is improved, but a result of phase separation occurs when the amount is too high or too low the decline of mechanical properties of materials ; increase in the amount of chain extender will cause the material glass transition temperature , the background reduce internal friction and the storage modulus increased ; increase in the number of carbon atoms of the chain extender and the introduction of the side chain group help to improve the impact properties of the material , the introduction of a flexible group is just the opposite ; increase in the number of carbon atoms at the same time help to reduce the glass transition temperature , the side chain groups and flexible groups introduced is conducive to improve the damping factor of the material . Studied the influence of different proportions and types of mixed polyether material properties , the results showed that : a polyether whether the functionality of the polyethylene glycol ( PEG 400 ) , polytetrahydrofuran diol ( PTMG1000 ) or a functionality of 3 330, are conducive to improve the internal friction of the material background ; PTMG1000 and polyether 330 also broaden the material damping temperature range , but the material compression performance decline ; mixed polyether join will certainly help to improve the impact properties of the material . Glass beads helps to improve the damping factor of the material , a slight increase in the background internal friction , but the glass microbeads Add will destroy the foam structure to a certain extent , resulting in the decrease of mechanical properties of the material ; changes in the pore size of the material the glass transition temperature little effect , but had a greater influence of the damping temperature and the storage modulus .

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CLC: > Industrial Technology > Chemical Industry > Synthetic resins and plastics industry > Polycondensation resin and plastic > Polyurethane (poly carbamate ) and plastic
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