Lec 17 - Natural Rubber

Question 1

Latex

Answer 1

milky fluid (suspension or emulsion in a liquid w varying refractive index)

Question 2

the higher the density,

Answer 2

the longer time light takes to pass through

Question 3

longer chains,

Answer 3

more elastic (length dictated by isopropene #)

Question 4

latex produced in

Answer 4

laticifiers

Question 5

articulated laticifiers

Answer 5

in a series of cells

Question 6

non-articulated laticifiers

Answer 6

in a single cell

Question 7

rubber latex

Answer 7

a watery liquid. “rubber” particles in suspension

Question 8

chicle:

Answer 8

a rubber latex once used for gum. from sapodilla > chicle means sticky stuff (wrigleys)

Question 9

why was latex produced:

Answer 9

its a chemical (noxious and poisonous repellent) used for anti-feedant (locust and chicory)

Question 10

location of latex in hevea:

Answer 10

inner bark w specialized cells called laticifiers (lat organized in concentric layers outside vascular cambium known as latex mantells

Question 11

waterproofing with rubber

Answer 11

Spaniards exploring south america dipped hats and cloaks in latex to produce waterproof clothing

Question 12

problem with rubber for waterproofing with weather conditions

Answer 12

heat > melted

cold > cracked