Fiber Impressions Flashcards
what is naturel fiber
vegetable, animal, mineral
what is manufactured fiber
regenerated from naturel fibers, synthetic fibers
what does bright field microscopy determine
diameter, color, shape, cross section shape
what other microscopes can you use to determine characteristics
bi-fringe, polarized, fluorescence light micro, SEM
what are some analytical test done
solubility, MP, float test, spectroscopy, dye extraction TLC
where is silk from
moths/butterflies
what kind of protein is silk, does it have a cross link
fibroin -gly.ala.gly.ala.ser-, no cross link
what is wool made of
keratin, is sheep hair follicle, absorbs water
what is cotton
seed fiber, has a lot of twists and convolutions
what is hemp/kenaf/flax
stem fiber from the stalk, hemp (cannabis), kenaf (hibiscus), flax (Cimon)
what is asbestos
is mineral fiber, fire resistant, from mining
how are synthetic fiber made
force hot concentrated polymers through a spinneret, really long thin strips
what is nylon
synthetic fiber - hosiery, tires
what polyester
synthetic fiber - high MP, translucent
what is polypropylene
synthetic fiber - carpet fiber, resistant to degradation
what is viscose/rayon
cellulose derived into clothing - carpets
what is acetate
cellulose derived - furniture
what are some other fibers
carbon fiber, glass fiber, ceramic fiber, steel fiber
what would a microscopic examination show for vegetable fibers
flattened twisted
what would a microscopic examination show for animal fibers
scales, cuticle
what would a microscopic examination show for synthetic fibers
unnatural cross sections
for MP analysis what does not melt
rayon
what to use for color analysis
microspec or TLC
what is refraction index used for
to classify glass
what is isotropic
where light is sent in 1 direction (glass)
what is anisotropic
where light is sent in multiple direction (fiber)
what is RI in the vaccum
it is 1
when is the value of evidence decreased
contamination, family environment, common fibers
when is the value of evidence increased
strangers, minimal delay, unusual items/fibers
