Study on Synthesis of Polyurethane Dispersion via Miniemulsion Polymerization
Date Issued
2004
Date
2004
Author(s)
Lee, Yuan-Hao
DOI
zh-TW
Abstract
本研究宗旨是利用迷你乳化合成水性聚胺酯(PU)乳液，探討影響分子量之因素，使成膜後之產物具有優良之機械性質，並進一步探討薄膜之熱性質。
在本研究中，以傅立葉轉換紅外線光譜儀(FTIR)來監測反應程度並鑑定產物之化學結構，再使用雷射煙塵粒徑分析儀來分析乳液之粒徑分佈，並對於粒徑分佈影響因素有一系列之探討。在乳液成膜後，以凝膠滲透色層分析儀(GPC)來分析其分子量分佈，討論包括反應溫度、界面活性劑、共安定劑、軟硬鏈段組成比例、Isocyanate Index、催化劑(T-12)、於有機相加入溶劑等變因對分子量之影響，之後進行機械性質之測試，包含抗張強度及伸長率，其中最佳的抗張強度可達到343.9 kg/cm2。在熱性質方面，分別以以熱重損失分析儀(TGA)、微差熱掃瞄分析儀(DSC)、動態機械分析儀(DMA)探討材料之熱裂解溫度及玻璃轉移溫度與材料結構之關係。
The target of the research was to synthesize polyurethane (PU) dispersion via miniemulsion process. We study the effect of parameters on molecular weight of PU that made PU film have strong mechanical properties. Also, the thermal properties of PU were investigated.
In this research, Fourier Transform Infrared Spectrometer (FTIR) was used to trace the extent of reaction and characterize the formation of PU. The droplet size distribution was characterized by Laser Diffraction Particle Size Analyzer, and effect of parameters on droplet size distribution was discussed. The influence of several factors, such as reaction temperature, surfactant, costabilizer, hard segment content, isocyanate index, catalyst, adding solvent in organic phase, on the molecular weight had been studied in detail by Gel Permeation Chromatogapher (GPC). The mechanical properties of PU film were studied including tensile strength and elongation, and the strongest tensile strength reached to 343.9 kg/cm2. Thermogravimetric Analysis (TGA), Differential Scanning Colarimetry (DSC), Dynamic Mechanical Analysis (DMA), were used to characterize thermal properties of PU.
Subjects
迷你乳化
水性聚胺酯
分子量
機械性質
miniemulsion
polyurethane dispersion
molecular w
Type
thesis
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