(3.236.231.14) 您好!臺灣時間:2021/04/15 07:54
字體大小: 字級放大   字級縮小   預設字形  
回查詢結果

詳目顯示:::

我願授權國圖
: 
twitterline
研究生:游建桐
論文名稱:聚雙馬來醯亞胺與甲基丙烯酸-2-羊巠基乙酯封端聚胺酯交聯環氧樹脂互穿型網狀結構體
論文名稱(外文):Interpenetrating Polymer Networks of Polybismaleimide and HEMA-terminated Polyurethane Crosslinked Epoxy
指導教授:謝國煌謝國煌引用關係
學位類別:碩士
校院名稱:國立臺灣大學
系所名稱:化學工程學研究所
學門:工程學門
學類:化學工程學類
論文種類:學術論文
論文出版年:1997
畢業學年度:85
語文別:中文
論文頁數:90
中文關鍵詞:接枝互穿型網狀高分子雙馬來醯亞胺聚胺酯改質雙馬來醯亞胺Izod耐衝擊強度破壞能量Gic相容性焦產量微相分離
外文關鍵詞:graft-interpenetrating polymer networkbismaleimidespolyurethane modified bismaleimidesIzod impactfrature energy GicCompatibilitychar yieldmicrophase separation
相關次數:
  • 被引用被引用:3
  • 點閱點閱:251
  • 評分評分:系統版面圖檔系統版面圖檔系統版面圖檔系統版面圖檔系統版面圖檔
  • 下載下載:0
  • 收藏至我的研究室書目清單書目收藏:0
利用同時聚合法製備一系列雙馬來醯醃亞胺或聚胺酯改質雙馬來醯亞胺/環氧樹脂接枝互穿型網狀高分子結構體(BMI or UBMI/EP graft-IPNs)。其中接枝劑為環氧樹脂與甲基丙烯酸-2-羥基乙酯(HEMA)封端的聚酯型(PBA-type)與聚醚型(PPG-type)聚胺酯。在固定接枝劑的含量下,改變環氧樹脂與雙馬來醯醮亞胺的組成,用以探討互穿網狀體的機械性質、熱性質與形態學關係。
抗張強度方面:在BMI/EP graft-IPNs系統中,較酯型接枝劑會比聚鏈型接枝劑系統具有較佳的抗張強度。而UBMI/EP graft-IPNs會比BMI/EP graft-IPNs具有較佳的抗張強度。lzod耐衝擊強度方面:兩個系統的耐衝擊強度皆隨BMI(或UBMI)含量增加而下降。在BMI/EP graft-IPNs系統中,當BMI含量25∼50wt%時,其耐衝擊值差異不大,表示系統已轉移為以BMI為主的相。破壞龍量GIc方面:BMT/EP graft-IPNs的系統中破壞能量並無提昇,然而在UbMI/EP graft-IPNs系統中則有增加破壞的韌性。
動態機械分析(Dynamic Mechsnical analysis, DMA)方面;BMI/EP graft-IPNs系統中,隨BMI含量的增加,高溫玻璃轉移溫度(Tgh)先往高溫再在低溫後回到高溫的情形。而UBMI/EP graft-IPNs系統,則發現會往低溫移動的現象,此表示系統相容性的提昇。微差熱掃描分析(Differential Scanning Calorimetry, DSC)顯示與DMA相同的結果。熱重量損失分析(Thermo Gravimetric analysis, TGA)結果顯示,BMI/EP graft-IPNs系統中,BMI含量的增加並沒有提昇起始裂解溫度,只有增加系統的焦產量(Char yield)。但UBMI/EP graft-IPNs系統中,則可發現起始裂解溫度與焦產量皆有提昇現象。UBMI/EP graft-IPNs具有較佳的熱穩定性。
SEM圍上顯示,BMT/EP graft-IPNs的形態學(Morphology)會因BMI的加入而變的不均質(Heterogeneous),有微相分鍵的產生。而且以PPG-type接枝劑的系統尤甚。UBMI/EP graft-IPNs則呈現均質(Homogeneous)的表面。
A series of Bismaleimides or Polyurethane modified bismaleimides/Epoxy graft-interpenetrating Polymer Networks were prepared using simultaneous polymerization method. The grafting agent were polyester type and polyether type polyurethane and terminated by epoxy and HEMA. The mechanical properties, thermal properties, and morphology of graft-IPNs are discussed based on the same amount of graft-agent content and different amount ofBMI and epoxy content.
The tensile strength of polyester-type graft-IPNs was higher than the polyether-type in BMI/EP graft-IPNs. And UBMI/EP graft-IPNs had higher tensile strength than BMI/EP graft-IPNs. The lzod impact strength also shows the value decreased with the increasing BMI content both in BMI/EP and UBMI/EP graft-IPNs. When the BMI content approaches 25wt% or more, the impact strength of the IPNs were almost the same, it means that the dominate phase had converted to BMI phase. The fracture energy GIc of BMI/EP graft-IPNs didn''t increase, but the toughness of UBMI/EP graft-IPNs increased.
DMA shows that the high glass transition temperature (Tgh) shifted to a higher temperature then to lower temperature with increasing BMI content. We find that the Tgh of UBMI/EP graft-IPNs shifted to lower temperature with increasing UBMI content. It means that the compatibility of the system was improved. DSC shows the same result as DMA. TGA shows that the decomposition temperature of BMI/EP graft-IPNs didn''t increase with increasing the BMI content, but the decomposition temperature and char yield of UBMI/EP graft-IPNs increased. It reveals that UBMI/EP graft-IPNs had better thermal stability.
SEM photograph shows that the morphology of BMI/EP graft-IPNs was heterogeneous, it reveals that the system had microphase separation. But that of UBMI/EP graft-IPNs was homogeneous.
QRCODE
 
 
 
 
 
                                                                                                                                                                                                                                                                                                                                                                                                               
第一頁 上一頁 下一頁 最後一頁 top
系統版面圖檔 系統版面圖檔