Test 1 Flashcards
Rayon is a natural fiber
false
What is the name of the natural mineral fiber that was used for insulation?
Asbesto
Kevlar was a fiber used for bullet proof vest. How would you classify it?
Manufactured Organic Synthetic Polymer
Textile fibers are separted into two main caterogies
Natural and Manfactured
All manufactured fibers are synthetic
False
How would you classfiy cotton?
Natural Cellulose
How would you classify wool?
Natural protein
How would you classify Rayon?
Manufactured organic natural polymer
How would you classify Olefin?
Manfucated organic synthetic polymer
How would you classify fiberglass?
Manufactured inorganic
Natural protein fibers come mainly from the hair of plants
False
Flax is a natural cellulose….seed,bast,or leaf fiber
bast fiber
Crimp fibers have more luster
false
Crimp can only be added to thermoplastic fibers
false
Fibers longer than 2 inches are called
long staple
are manfauctured fibers uniform?
yes
Linear density can be calculated from what?
mass and length, diameter and mass density
are natural fibers uniform or nonuniform?
nonuniform
is micronaire used to determine the fineness of polyester fibers?
no
is micronaire related to fiber maturity?
yes
is micronaire related to fiber fineness?
yes
is micronaire an indirect measure of the fineness of a group of cotton fibers?
yes
is micronaire a measure of the resistance of air flow through a sample of fibers?
yes
melt spun fibers generally have an irregular cross section
true
Generally one uses the () knob first to move the specimen toward the objective lens then moves the () knob for a refined image to look at various parts of the specimen.
coarse focus, fine focus
The () connects the tube and the base and is often used to carry the microscope.
arm
Solution spun fibers generally have an irregular cross section.
true
Fiber cross sections can assist a person with identifying the fiber.
true
What is the flat surface of the microscope where the slides are placed for viewing?
stage
After the specimen image passes through the objective, the image is:
inverted
Birefrignence causes anisotropic materials to change color when placed between 2 polarized films
true
polymer in a fiber may be partially oriented
true
by heating a filmanent without drawing we can increase the polymer orientation
false
when you polymerize many monomers together end to end you create a
polymer
temp at which portions of polymer chains not crystallied become mobile
glass transition temp
temp at which portions of polymer chains embedded in crystals become mobile
melting point
temp at which a polymer begins to degrade into components
decomposition temp
fibers that have been properly drawn are
anisotropic, more crystalline stronger
isotropic materials exhibit birefringence
false
drawing increase the
size of crystalline units, percent of crystalline, the orientation of the polymer chains, the orientation of crystalline units
How are the length of manufacured fibers determined and what is that process called?
manufacturing process
Which type of mount would help you the most in identifying a fiber
longitudinal mount with polarized light
protein fibers
composed of polymers of amino acids
cellulosic fibers
formed from glucose
mineral fibers
composed of silica obtained from rocks or sand
synthetic fibers
polymers thar originate from small, organic molecules that combine w water and air
linear density equation (denier)
9000*fiber length
linear density equation (tex)
1000*fiber length
flax
natural cellulose
mohair
natural protein
rayon
manufactured cellulose
nylon
manufactured synthetic
polyester
manufactured synthetic
acyrlic
manufactured synthetic
metallic
manfucatured inorganic
crystalline region
parallel to each other
amorphous region
randomly oriented
anisotropic
not having the same physical properties
