Effects of Swelling Conditions on the Superstructure of PVA Films during the Wet Drawing Process 


Vol. 53,  No. 3, pp. 165-170, Jun.  2016
10.12772/TSE.2016.53.165


PDF
  Abstract

The effects of swelling conditions on the superstructure of polyvinyl alcohol (PVA) films containing 10 wt% glycerol were investigated. The water content of PVA films increased as the swelling temperature and swelling time increased. An abrupt increase in water content was observed between 40 and 50 oC in the vicinity of Tg of PVA. The water content leveled off after approximately 100 s at all swelling temperatures except 50 oC, where it decreased after approximately 200 s. In the differential scanning calorimeter (DSC) measurement, the peak temperature for water evaporation was shifted to a value higher than 100 oC and became sharper with increasing swelling temperature. Wide angle X-ray diffraction (WAXD) profiles of PVA films revealed that the degree of crystallization had decreased with increasing water content; however, the average crystal size remained largely unchanged. For PVA films drawn at 50 oC in water, the diffraction peak for the (101) plane became sharper and increased with draw ratio. The degree of crystallization of swollen PVA films in water significantly increased with increasing draw ratio, whereas there was no noticeable change in the crystal size.

  Statistics
Cumulative Counts from November, 2022
Multiple requests among the same browser session are counted as one view. If you mouse over a chart, the values of data points will be shown.


Search
(IN TITLE, AUTHOR, ABSTRACT,KEYWORDS)

Advanced Search ▼

POPULAR KEYWORDS
(TOP 10 KEYWORDS)

Recent Publications
(LAST 3 YEARS)

pISSN : 1225 - 1089
eISSN : 2288 - 6419

한국연구재단 우수등재학술지 유지 (2022년)