ที่มา:วิทยาสารเกษตรศาสตร์ สาขา วิทยาศาสตร์

หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Isothermal Crystallization Kinetics of Polypropylene/CaCO3 Blends)

ผู้เขียน:ดร.ณัฐณรัณ (สุปรียา) ตรีวิจิตรเกษม, รองศาสตราจารย์, Kriengkri Timsorn

สื่อสิ่งพิมพ์:pdf

Abstract

Crystallization of polypropylene (PP) and PP blended with 10, 15, and 20 wt% CaCO3 was investigated using Differential Scanning Calorimetry (DSC) under isothermal conditions at four different crystallization temperatures of 110, 115, 120 and 125?C. The kinetic parameters were analyzed using the Avrami equation. The results show that the Avrami exponent, n, decreased with increasing crystallization temperature, except for a crystallization temperature TC of 125?C where the opposite effect was observed. At the same crystallization temperature, the values of n for PP/CaCO3 blends were slightly lower than for PP, which suggests that the addition of CaCO3 to PP caused a slight decrease in heterogeneous nucleation. Both PP and PP/CaCO3 blends followed three-dimensional crystallization growth. The value of the crystallization rate constant, k, strongly depended on the crystallization temperature, which decreasing with increasing crystallization temperature and CaCO3 content. The rate of the three-dimensional crystallization growth was reduced by increasing the crystallization temperature and CaCO3 content.

Article Info

Agriculture and Natural Resources -- formerly Kasetsart Journal (Natural Science), Volume 043, Issue 5, Dec 09 - Dec 09, Page 347 - 352 |  PDF |  Page