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  5. 奈米碳管影響自聚式P(MMA-co-EMA)聚合程度之研究
 
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奈米碳管影響自聚式P(MMA-co-EMA)聚合程度之研究

Type
thesis
Date Issued
2007-07-30
Author(s)
洪玉貞
Advisor
柯恩生
Subjects
系所名稱:口腔科學研究所
Description
學位別:碩士
語文別:中文
指導教授:柯恩生
共同指導教授:楊正昌
口試委員:王賢達
中文關鍵字:聚甲基丙烯酸甲酯;奈米碳管;殘留單體
Abstract
Poly(methylmethacrylate)PMMA至今已使用了五十餘年,在醫學上的應用佔有舉足輕重的地位。但是仍有因聚合不完全,產生殘留單體的問題;聚合作用時產生的放熱溫度過高;聚合作用時因聚合放熱不均產生的殘留應力造成材料彎曲變形,殘留單體對人體會造成不好的影響,也會影響其機械性質。
本研究嘗試加入奈米碳管,希望利用它的良好熱傳導性,使其放熱均勻,始聚合反應更完全,減少殘留單體。利用Differential Scanning Calorimetry (DSC)測量聚合作用所產生的熱量加以推算聚合程度。利用High performance liquid chromatography (HPLC)測量殘留單體。利用K-type Thermocouple 測量室溫下聚合作用所產生的溫度。利用凝膠滲透層析儀Gel Permeation Chromatograph (GPC) 測量聚合物分子量大小。利用測量拉伸強度。
BPO含量0.5 wt %中,SCNT含量0.05 %為分界,高於0.05 %?h到達最高溫度時間由15 min拉長至26 min。殘留單體量由4.38 %提高至17.17 %。拉伸強度由47.65 MPa降低至34.33 MPa。分子量與分子量分佈Mw = 1065257 Mw/Mn = 2.87。BPO含量2.0 wt %,加入SCNT之後,到達最高溫度時間由8 min 縮短至5.23 min。SCNT含量高於0.2 % 則殘留單體由0.9 % 提高至3.3 %。拉伸強度由54.79 MPa 降低至41.82 MPa。分子量與分子量分布Mw = 830190 Mw/Mn= 3.2。SCNT的濃度與Self-polymerizing PMMA聚合反應有兩方面的影響:一方面導熱性高,提高聚合反應,但是另一方面又會消耗自由基,適當的BPO-DMPT才可以使SCNT的特性展現出來,這兩方面是互相影響
URI
https://203.71.86.71/handle/123456789/11966
https://hdl.handle.net/11296/858usu
File(s)
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Name

C0187302.pdf

Size

17.72 MB

Format

Adobe PDF

Checksum

(MD5):22ab6f5b5207f456ac8d7257c7c21326

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