ที่มา:วิทยาสารเกษตรศาสตร์ สาขา วิทยาศาสตร์

หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Differential Scanning Calorimetric Studies of Non-isothermal Crystallization of HDPE and HDPE/CaCO3 Composites)

ผู้เขียน:ดร.ณัฐณรัณ (สุปรียา) ตรีวิจิตรเกษม, รองศาสตราจารย์, Thanate Sukkamart, พนม กาศรุณ

สื่อสิ่งพิมพ์:pdf

Abstract

Crystallization of high density polyethylene (HDPE) and HDPE/CaCO3 composites (10, 20 and 30% wt, CaCO3) was investigated by differential scanning calorimetry (DSC) under non-isothermal conditions. The Avrami method modified by Jeziorny and a method developed by Liu et al. were employed to describe the non-isothermal crystallization process of the samples. The results showed that the Avrami exponent n decreased from 3.0 to 2.4 with an increase in the cooling rate from 5?C/min to 40?C/min, while the crystal growth constant Zc was nearly constant (~1.1) at a 10?C /min – 40?C/min cooling rate for all systems. The value of F(T) showed that the crystallization rate of the HDPE/10% CaCO3 composite was the slowest at a given cooling rate. Moreover, the activation energy determined from the Kissinger method indicated little difference in the values of the activation energy for all systems, except the 30% CaCO3 system which showed a slightly higher activation energy.

Article Info

Agriculture and Natural Resources -- formerly Kasetsart Journal (Natural Science), Volume 042, Issue 4, Oct 08 - Dec 08, Page 776 - 783 |  PDF |  Page