本研究首先以含苯磺酸之單體Dimethyl 5-sulfoisophthalate Sodium Salt (SIPM)分別與不同分子量Polyethylene glycol（PEG）醚型軟鏈節進行酯交換反應以合成磺酸基的親水性軟鏈節（PEG-SIPM-PEG）。進而以Polycaprolactone diol (PCL)為軟鏈節，4，4-Methylene bis（isocyanatocyclohexane）(H12MDI)為硬鏈節合成末端預留NCO基團之疏水性PU預聚合鏈段；再於預聚合鏈節中單獨導入PEG-SIPM-PEG合成PU(S-PU)或加入H12MDI與不同含量PEG-SIPM-PEG軟鏈合成PU(SB-PU)，並應用於織物透濕防水加工。
合成物之DSC分析方面，S-PU其Tg隨著軟鏈中PEG分子量的增大而下降，SB-PU其Tg則在軟鏈為PEG分子量400之PU時隨著親水成份的增加而提高，在PEG分子量1000之PU時隨著親水成份的增加而下降，但PEG分子量2000之PU時無Tg之出現。在Tm方面，則以S-PU 之PEG分子量1000者大於PEG分子量2000者，PEG分子量400者則無Tm；△H方面，以S-PU之PEG分子量2000者大於PEG分子量1000者，PEG分子量400者則無△H。另外SB-PU其PEG分子量為400者在親水鏈段硬鏈莫耳數為2以上時有Tm出現，且Tm溫度隨親水成份含量的增加先降後升；PEG分子量1000者及2000者Tm及△H則隨親水鏈段含量增加而提高。在耐隆塗佈加工布之透濕防水性方面， S-PU加工布透濕度、強力及伸率隨軟鏈中PEG分子量愈大而增大，耐水壓則以PEG分子量1000者為最佳，分子量400者為最差。SB-PU加工布之透濕性隨著親水性軟鏈含量的增加而提升耐水壓則下降。在加工布機械性質方面，SB-PU加工布當PEG分子量400時其強力隨軟鏈含量的增加而上升，其伸率則先升後降，PEG分子量1000時強力隨軟鏈含量增加先升後降，伸率則隨軟鏈含量增加而上升，PEG分子量2000時其強力隨軟鏈含量增加而下降，伸率則隨軟鏈含量增加而上升。至於加工條件及溶劑組成對加工布透濕防水性方面，S-PU加工布在PEG分子量2000時以低溫長時間或高溫短時間之預乾條件者其加工布兼具最佳的透濕與耐水壓之平衡；但溶劑組成在本研究的加工條件下其對加工布之透濕性及耐水壓影響並不明顯。

In this study, first, transesterification was proceeded by Dimethyl-5-sulfoisophthalate salt(SIPM) and Polyethylene glycol(PEG) of different molecular weight for hydrophilic soft segment(PEG-SIPM-PEG). The NCO group terminated hydrophobic PU prepolymer was synthesized by PCL as soft segment, H12MDI as hard segment, and then added the soft segment PEG-SIPM-PEG to produce PU(S PU). On another side, we added the H12MDI and PEG-SIPM-PEG of different content to synthesis PU(SB PU). The PU was applied to the water vapor permeability and water resistance of fabrics.
The analysis of thermal properties, when the PEG molecular weight of soft segment increased, the Tg of S PU decreased. The Tg of SB PU type containing PEG400 increased as the content of hydrophilic section increased , but the Tg of SB PU with PEG1000 shows opposite tendency and other with PEG2000 without Tg. The Tm of S PU with PEG1000 was high than S PU with PEG2000, but S PU with PEG400 did not possess the Tm. The △H of S PU with PEG2000 was larger than S PU with PEG1000, but S PU with PEG400 did not possess the △H. The Tm of SB PU with PEG400 and hard segment of the mole above 2 in hydrophilic section, and its Tm increased first but decreased next as increased the content of hydrophilic section. The Tm and △H of SB PU with PEG1000 or PEG2000 increased as the content of hydrophilic section increased.
In the properties of finished fabrics, the fabric treated by S PU had good water vapor permeability, tensile strength and elongation as PU containing PEG of large molecular weight. The S PU with PEG of molecular weight 1000 had best water resistance, but PEG400 molecular weight was poorest. The water vapor permeability of treated fabrics increased but the water resistance reduced as hydrophilic section content of SB PU increased. SB PU with PEG of molecular weight 400 shows the increase of tensile strength when the content of hydrophilic section increased, and the elongation of treated fabrics increased first but decreased next. The fabrics treated by SB PU with PEG of molecular weight 1000 showed increase of tensile strength in the low content of hydrophilic section but decreased in high content, but its elongation increased as increasing the content of hydrophilic section. Within the SB PU with PEG of molecular weight 2000 the tensile strength of treated fabrics decreased as increase of hydrophilic section content, but the elongation was reverse. Considering the conditions of finishing and solution, S PU with PEG of molecular weight 2000 had excellent water vapor permeability and water resistance of treated fabrics in predry of low temperature and long time or high temperature and short time. The composition of solution was not obvious effect to the properties of treated fabrics.

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