研究生: |
鍾宛倫 Wan-lun Chung |
---|---|
論文名稱: |
由元素矽水解法合成無機二氧化矽奈米顆粒及以RAFT活自由基聚合法合成用於不飽和聚酯、乙烯基酯及環氧樹脂具核殼型結構之高分子接枝二氧化矽奈米顆粒及高分子接枝蒙特那石黏土之抗收縮劑及增韌劑 Synthesis of nano-scale colloidal silica from elemental silicon by hydrolysis, and synthesis of polymer-grafted silica nanoparticle and polymer-grafted monomorillonite clay with core-shell structure as low-profile additives and tougheners for unsaturated polyester, vinyl ester, and epoxy resins by RAFT living free radical solution polymerizations |
指導教授: |
黃延吉
Yan-Jyi Huang |
口試委員: |
陳崇賢
Chorng-Shyan Chern 邱文英 Wen-Yen Chiu |
學位類別: |
碩士 Master |
系所名稱: |
工程學院 - 化學工程系 Department of Chemical Engineering |
論文出版年: | 2014 |
畢業學年度: | 102 |
語文別: | 中文 |
論文頁數: | 211 |
中文關鍵詞: | 無機/有機核殼型顆粒(CSP) 、抗收縮劑 (LPA) 、增韌劑 、可逆加成-斷裂鏈轉移聚合法(RAFT) 、乙烯基酯樹脂(VER) 、体積收縮 、機械性質 、聚合固化樣品之微觀型態結構 、掃瞄式電子顯微術(SEM) 、穿透式電子顯微術(TEM) |
外文關鍵詞: | inorganic/organic core-shell particle (CSP); low |
相關次數: | 點閱:616 下載:5 |
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本文探討用作熱固性樹脂抗收縮劑及增韌劑之奈米級無機/有機核殼型顆粒(CSP)的合成,其對低收縮乙烯基酯樹脂在聚合固化後之樣品微觀型態結構、体積收縮特性及機械性質的影響。這些核殼型顆粒(CSP),以SiO2-polymer標示之,係以二氧化矽奈米顆粒(SNP)為核心及有機高分子為外殼,以Z支撐的可逆加成-斷裂鏈轉移聚合法(RAFT),利用二氧化矽支撐的3-(benzylsulfanylthiocarbonylsulfanyl) propionic acid (Si-BSPA)作為鏈轉移試劑合成而得。其中,直徑15 nm的二氧化矽奈米顆粒是以可控制顆粒尺寸的矽元素水解法合成,而SiO2-polymer核殼型顆粒的高分子外殼為聚丙烯酸甲酯(PMA)、丙烯酸甲酯(MA)與甲基丙烯酸環丙氧烷酯(GMA)的共聚合物(poly(MA-co-GMA))、丙烯酸丁酯與丙烯酸甲酯之團聯共聚合物(PBA-b-PMA)、或聚丙烯酸丁酯與丙烯酸甲酯(MA)及甲基丙烯酸環丙氧烷酯(GMA)的共聚合物之團聯共聚合物(PBA-b- poly(MA-co-GMA))。
依所使用之乙烯基酯VER樹脂基材的分子量、核殼型顆粒CSP的添加量、及CSP的外殼高分子組成, CSP可使VER樹脂在聚合固化過程中的環化反應減少,在聚合固化過程中所產生的微膠体結構因之較不排列緊密,進而有利於聚合固化後之本質聚合收縮的減少。吾人發現,適度調整VER 樹脂基材的分子量,以防止苯乙烯(St)/乙烯基酯(VER)/SiO2-polymer三成份系在聚合固化反應前之相分離的發生,添加較高含量的SiO2-polymer作為抗收縮劑LPA,可以導致聚合固化後較小的体積收縮率。添加10%重量比的15nm粒徑的SiO2- polymer可使体積收縮率較之純VER樹脂系減少80%。同時,添加10%重量比的15nm粒徑的SiO2- polymer可使耐衝擊強度及楊氏模數,較之純VER樹脂系,分別增加80%及25%,但會使抗張強度減少30%。
Synthesis of nano-scale inorganic/organic core-shell particle (CSP) as low-profile additives (LPA) and toughenors for thermoset resins, and their effects on the cured sample morphology, volume shrinkage characteristics and mechanical properties for low-shrink vinyl ester resins (VER) during the cure were investigated. These CSP designated as SiO2-polymer, which contained silica nanoparticle (SNP) as the core and organic polymer as the shell, were synthesized by the Z supported reversible addition-fragmentation chain transfer (RAFT) graft polymerization using silica-supported 3-(benzylsulfanylthiocarbonylsulf- anl) propionic acid (Si-BSPA) as the chain transfer agent (CTA). The silica nanoparticle with a diameter of 15 nm was synthesized by size-controllable hydrolysis of elemental silicon, whereas the grafted polymer as the shell of the SiO2-polymer was made from poly(methyl acrylate) (PMA), copolymer of MA and glycidyl methacrylate (poly(MA-co-GMA)), poly(butyl acrylate)-block-poly(methyl acrylate) (PBA-b-PMA) or PBA-block-poly(MA-co-GMA).
Depending on the molecular weight of the VER resin matrix employed, the content of CSP, and the shell composition of CSP, the CSP could lead to a reduction of cyclization reaction for VER resins during the cure, and the microgel structure during the cure would be less compact, and, in turn, be favorable for the decrease of intrinsic polymerization shrinkage after the cure. It was found that with the adjustment of VER molecular weight to prevent the phase separation of the St/VER/SiO2-polymer ternary system prior to cure, adding a higher content of SiO2-polymer as an LPA in the VER resin may result in a lower volume shrinkage after cure, and adding 10% of 15 nm size of SiO2- polymer can lead to a decrease of volume shrinkage by 80%. Also, adding 10% of 15 nm size of SiO2- polymer can result in an increase of impact strength and Young’s modulus, by 80% and 25%, respectively, but a decrease of tensile strength by 30%.
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