Question

P 0.990 g cm) sa 0lo ar 5. Fuller and Erickson (1937) prepared a series of oriented polyesters and examined these by means of x-rays. Which of the two structures (a) and (b) shown below would you expect to have the lower T, value? Fiber Period /A Structure 16ol (a) -c-(CH ),-C-0-(CH) O 31.2 18AT polyethylene azelate -C-(CH)s C-o-(CH2)7 O (b) 16.67 polyethylene sebacate

Answer 1

Higher the fiber period, the smaller is the melting temperature (T_m) and vice-versa.

Hence, Polyethylene azelate will have a lower T_m value.