Testing and quality assurance

Question 1

mechanical properties

Answer 1

force
deformation
time
electronic measurement 
graphical and calculated results 
measurements are repeatable

Question 2

Instron: tensile testing

Answer 2

a small sample is controlled gradually increasing uniaxial tension until failure
samples = film and fiber
tear apart from one another

Question 3

Instron: compressive testing

Answer 3

compressive strength = capacity of a material to withstand axially directed pushing forces

Question 4

texture test

Answer 4

stress relaxation

creep recovery experiment

Question 5

stress relaxation experiment

Answer 5

strain is applied to sample instantly and held constant with time
stress monitored as a function of time
stress decrease with time starting high and finishing at 0
square graph

Question 6

creep recovery experiment

Answer 6

stress is applied to sample instantly and held constant for a certain time then stress reduced to 0 and the strain is monitored as a function of time
curve graph

Question 7

factors influencing gas transmission

Answer 7

Temperature
relative humidity
thickness
level of plasticizer 
microperforation 
creases

Question 8

thermal analysis

Answer 8

to measure heat flow, weight loss, dimensional change, mechanical properties as function of temperature
TGA and DMA

Question 9

thermogravimetric analysis TGA

Answer 9

mass of sample measured over time as the T changes

Question 10

Dynamic mechanical analysis DMA

Answer 10

mechanically deform a sample and measure sample response as a function of temperature or time

Question 11

storage modulus E’

Answer 11

elastic component related to samples stiffness

Question 12

loss modulus E”

Answer 12

viscous component related to the sample’s ability to dissipate mechanical energy through molecular motion

Question 13

tangent of phase difference

Answer 13

relationship between the elastic and inelastic components