臺灣博碩士論文加值系統

環氧樹脂性質優良,但其本身的脆性使應用略受限制,本文主要使用脂
肪族胺硬化劑,另外還使用兩種不同凝膠含量的高分子多元胺硬化劑,探討
其硬化反應動力學,與不同的凝膠含量對於物性的影響. 本研究採用的
三種動力學方程式,在任何一個硬化劑的系統,都不能完全敘述環氧樹脂硬
化反應的動力學,總是在某轉化率以上即與實 驗值偏離,但大體而言,
包含n級反應速率常數和自催化反應速率常數的方程式dx/dt=(K1+K2
x^m)(1-x)^n,比較能正確反應環氧樹脂硬化的情形;在高分子型胺硬化劑
中,凝膠含量較高者,總反應級數較高,反應較慢;而在DMA的測試及SEM的觀
察上,顯示凝膠含量高的硬化劑,交連程度高,耗能模數高,低溫斷裂後呈一
圈圈的片狀裂紋,表示存在高分子的接枝共聚合物,能分散外力,使破壞能
量增加.

Epoxy resins has excellent properties,but its brittleness
makes someapplication restricted.This study uses ether diamine
and polymeric aminecuring agents containing different gel
content to cure epoxy resin, the kinetics and physical
properties are studied. This study uses three kinetic models
to describe the curing behavior of different curing agent.No
any of kinetic models can completely correspond to curing
reactions accurately,especially when the conversion exceeds
60%.The model with equation dx/dt=(K1+K2x^m)(1-x)^n,includes
the n order reaction rate constant and autocatalytic reaction
rate constant ,can describe the curing behavior of epoxy
resins better than other models .The polymeric amine curing
agents with more gel content show a higher loss modulus.The
low temperature fractal surface exhibits a local circle-like
crack pattern for polymer amine curing agents.This shows the
addition of polymer amine curing agents can disperse impact
energy and increase the toughness.