Fiber Impressions

Question 1

what is naturel fiber

Answer 1

vegetable, animal, mineral

Question 2

what is manufactured fiber

Answer 2

regenerated from naturel fibers, synthetic fibers

Question 3

what does bright field microscopy determine

Answer 3

diameter, color, shape, cross section shape

Question 4

what other microscopes can you use to determine characteristics

Answer 4

bi-fringe, polarized, fluorescence light micro, SEM

Question 5

what are some analytical test done

Answer 5

solubility, MP, float test, spectroscopy, dye extraction TLC

Question 6

where is silk from

Answer 6

moths/butterflies

Question 7

what kind of protein is silk, does it have a cross link

Answer 7

fibroin -gly.ala.gly.ala.ser-, no cross link

Question 8

what is wool made of

Answer 8

keratin, is sheep hair follicle, absorbs water

Question 9

what is cotton

Answer 9

seed fiber, has a lot of twists and convolutions

Question 10

what is hemp/kenaf/flax

Answer 10

stem fiber from the stalk, hemp (cannabis), kenaf (hibiscus), flax (Cimon)

Question 11

what is asbestos

Answer 11

is mineral fiber, fire resistant, from mining

Question 12

how are synthetic fiber made

Answer 12

force hot concentrated polymers through a spinneret, really long thin strips

Question 13

what is nylon

Answer 13

synthetic fiber - hosiery, tires

Question 14

what polyester

Answer 14

synthetic fiber - high MP, translucent

Question 15

what is polypropylene

Answer 15

synthetic fiber - carpet fiber, resistant to degradation

Question 16

what is viscose/rayon

Answer 16

cellulose derived into clothing - carpets

Question 17

what is acetate

Answer 17

cellulose derived - furniture

Question 18

what are some other fibers

Answer 18

carbon fiber, glass fiber, ceramic fiber, steel fiber

Question 19

what would a microscopic examination show for vegetable fibers

Answer 19

flattened twisted

Question 20

what would a microscopic examination show for animal fibers

Answer 20

scales, cuticle

Question 21

what would a microscopic examination show for synthetic fibers

Answer 21

unnatural cross sections

Question 22

for MP analysis what does not melt

Answer 22

rayon

Question 23

what to use for color analysis

Answer 23

microspec or TLC

Question 24

what is refraction index used for

Answer 24

to classify glass

Question 25

what is isotropic

Answer 25

where light is sent in 1 direction (glass)

Question 26

what is anisotropic

Answer 26

where light is sent in multiple direction (fiber)

Question 27

what is RI in the vaccum

Answer 27

it is 1

Question 28

when is the value of evidence decreased

Answer 28

contamination, family environment, common fibers

Question 29

when is the value of evidence increased

Answer 29

strangers, minimal delay, unusual items/fibers