本實驗目的在於製造高自由體積之水性PU粉末。傳統PU結構由高分子軟質段的多元醇與單體硬質段異氰酸鹽構成，鋪成膜後彈性與熱性質皆非常優異。水性PU則是在環保意識抬頭之後的產品，減少有機溶劑的使用。本研究主題化合物有兩種，第一種為水性PU，Chen[11]等人發現，長硬質鏈段的水性PU，由於離子基會聚集，導致鏈段之間會出現孔隙，推測其孔隙可以吸附氫氣、氧氣或是二氧化碳。因考量到吸附性質需求孔隙要大，合成時將結構中的高分子軟質段以三聚氫胺(Melamine)取代，合成出全硬段的高分子，以增加其孔隙。並由於Melamine是三官能基，產物為交聯物，孔隙可以更為增加。使用Melamine的另外一個因素是由於Melamine有六個氮原子，與氫原子產生氫鍵，把氫氣留在化合物表面，以增加吸附能力。本研究隨著離子基(DMPA)含量的變化，觀察該材料的熱性質與吸附氣體能力。第二種化合物是三聚氰胺甲醛高分子(Melamine-Formaldehyde polymer)，也由於Melamine為三官能基，Formaldehyde為雙官能基，產生交聯，藉由其中的孔隙與Melamine上的氮原子形成氫鍵吸附氣體。本研究藉由改變Melamine與Formaldehyde的mole比，探討各組成的熱性質與吸附氣體能力。 The aim of this experiment is to produce powder which is composed by waterborne polyurethane of high free volume. Traditional PU structure consists of polyol of macromolecular soft segment and diisocyanate, thermal property and elasticity will become excellent after paved as membrane. Waterborne PU can be used to reduce the use of organic solvent, especially environment protection increasingly draws much attention. This research focuses on two subject chemicals. The first one is Waterborne polyurethane. It was found by Chen[11] etc that Waterborne polyurethane of long hard segments produces holes among segments because ionic aggregates. As a result, it was inferred to be able to absorb hydrogen, oxygen and carbondioxid. Considering that better absorption ability needs larger holes, macromolecule of whole hard segments is synthesized to increase holes by substituting Melamine for soft segment of macromolecule. Because Melamine is a tri-functional group and it makes the WPU crosslinking, holes can increase more. another reason of using Melamin is that it owns six nitrogen atoms, able to form Hydrogen bonds to attach much more Hydrogen atoms on surface of chemicals. Waterborne polyurethane observes heat property and hydrogen, oxygen, and carbondioxid absorption capabilities with change on the containing of ionic group(DMPA). The second chemicals is Melamine-Formaldehyde polymer. Melamine of tri-functional group and Formaldehyde of di-functional group can crosslink to produce holes. These holes and Nitrogen atoms can form hydrogen bonds to absorb the desired gas. This research also study the heat property and gas absorption capabilities, of different composition by changing mole ratios of Melamine and Formaldehyde.
