Physical Properties Flashcards
(14 cards)
fundamental force between molecules and atoms
Electromagnetism
rank the types of bonds in order from strongest to weakest
what type of force?
elactrostatic INTERACTION
FORCE IS ELECTROMAGNETIC
- ionic
- covalent
- metallic
- hydrogen
- van der waals
CTE?
coefficient for thermal expansion
thermal expansion shrinkage can cause?
internal stress -> decreased mechanical properties
high CTE could lead to?
post-operative sensitivity in association with a high CTE
implication of thermal expansion of different layer of material?
can cause interfacial stress, leading to bonding failure
thermal diffusivity ?
thermal conductivity and rates of conducting heat
how easily heat will diffuse throughout the material
hot –> cold
compare metal thermal expansion to glass
metal has a greater coefficient of thermal expansion than glass/non metal
expansion and shrikage can cause stress and thus decreased mechanical properties
melting point
temperature of a crystalline material changes from a solid to a liquid
- FIRST ORDER
Tg?
Glass transition point
- termperature of a amorphous material becomes rubbery
*SECOND ORDER
T/F semi - crystalline materials show both first order and second order
which is lower? occur first?
True - first order – melting point
second order – glass transition point
glass is always lower
definition of viscosity
is a measure of the resistance of a fluid which is being deformed by either shear stress or tensile stress
surface properties related with bulk materials
- hardness
- color
- gloss
- roughness
- ware
what is determined by surface property of a material
1, adhesion
- bonding
- wettability
- surface roughness
most cell interactions to biomaterials are determined by the surface
