臺灣博碩士論文加值系統

本研究旨在探討光擴散劑(Optical Diffusing Agent；ODA)對PMMA光學性能之影響效應，實驗上使用的ODA參數，其形狀為球型粒子 (sphere)之Polystyrene(PS系統)，折射率為1.59及PMMA/PS Copolymer(MS系統)，折射率為1.52之有機系高分子，各別選用4種ODA平均粒徑為參數，且每種參數包含5種重量百分比(wt%)，經由上述材料參數之變化探討其對光學性能之影響效應。
另一方面，探討基材PMMA上使用二段式聚合之方式，第一段之預聚合物使用Brookfiled Viscometer進行real time之反應，測試PMMA聚合反應的黏度變化；而第二段聚合反應之測試，則以Cone and Plate Rheometer來檢測其聚合反應時間曲線圖，以獲得最適合之加工參數。
光擴散板之製造方式，使用Casting法，先將預聚合物(Prepolymer)的黏度控制於3500~4000cP之範圍下，以聚混摻方式，添加5種重量百分比的ODA，最後以澆鑄法製備成PMMA光學擴散板，做為光學測試之試片。
光性能之測試依ASTM D1003之標準規範，使用Haze-Gard Plus 4726測試光擴散板的霧度(Haze)、透光度(Transmittance) 及清潔度(Clarity)；在可視角(Angle of View；AOV)測試方面，則使用Autronics Conoscopes 測試光擴散板的可視角。
實驗結果顯示，光擴散板的AoV，Haze會隨著ODA的折射率提高而增加；而平均粒徑則愈小，光擴散板之重量含有率( volume fraction )會愈高，則產生光散射與折射之機率亦隨之昇高，因而促使AOV，Haze之有提高之趨勢，亦即可得較佳光擴散性能，當ODA添加量增加時，其遮蔽效果越佳，光擴散效率越好，使得光線更均勻分配。

The subject of this study is exploring the influence of optical diffusing agent (ODA) on PMMA optical Performance，the selected ODA paraments for manufacturing optical diffusion plate in the experiment are mainly the organic polymer with spherical particle in morphology，in which containing two kinds of different refractive index polymer. In each refractive index，there are four ODA parameters of different particle size range，five different weight percent(wt%)ODA.
We will discuss the two-steps Polymerization of MMA monomer，in the first step the Prepolymer will be tested the viscosity change using Brookfiled Viscometer by real time measurement method. In the second step polymerization. We use Cone and Plate Rheometer to test the reaction time of prepolymer to get the optimum processing parameters，concerning the two-steps polymeric manufacturing process，the viscosity of prepolymer is first controlled during 3500-4000cP，then adds the fixed proportional ODA by polyblend to manufacture PMMA optical diffusion plate by casting molding.
According to the standard ASTM D1003，we use Haze-Gard Plus 4726 to test the Haze(%)，Transmittance(%)，Clarity(%) of diffusion plate，in the test of Angle of view，We use Autronics Conoscopes to test the light optical influence of AoV(Angle of Veiw) Parameters.
The experiment shows the following results︰ (1) the diffusion Angle of the diffusion plate goes up as the ODA refractive index rise.(2)As the particle size of ODA becomes smaller，and the weight fraction of the powder in the diffusion plate become higher，and the probability of causing light scattering get higher.
So the trends are toward higher the Angle of view and Haze getting better diffusion Performance. As the added quantity of ODA increase, the shielding effect of the particle become better and the light distribute more average. ODA is a high transmission polymer, so it possesses high diffusion and transmission performance.

摘要 I
Abstract III
致謝 V
目錄 VI
圖表索引 IX
表格索引 XII
第1章 序論 1
1-1 前言 1
1-2 研究背景及現狀 5
1-3 本研究特徵及目的 5
1-4 本研究之構成 6
第2章 相關理論與文獻回顧 7
2-1 PMMA發展歷史 7
2-2 聚甲丙烯酸甲酯文獻回顧 10
2-3 PMMA之反應機構 12
2-3-1自由基聚合方式 12
2-3-2 PMMA自由基聚合反應機構 15
2-4 澆鑄法(Casting Molding)成形高分子材料 16
2-5 高分子聚摻合理論 17
2-6 LCD之背光模組之簡介 22
2-7 光學擴散之結構 29
2-8 光學擴散板原理 30
2-9 分析測試儀器原理及應用 32
2-9-1 同心圓黏度計(Concentric Cylinder Viscometer) 32
2-9-2 錐板流變儀(Cone and Plate Rheometer) 34
2-9-3 可視角量測(Angle of View and Gain ) 36
2-9-4 霧度計(Haze-Gard Plus 4726)【33】 38
2-10 參考文獻 40
第3章 聚甲基丙烯酸甲酯之聚合反應研究 45
3-1 前言 46
3-1-1 實驗材料 48
3-1-2 實驗流程 48
3-1-3 實驗設備與儀器 49
3-2 結果與討論 51
3-2-1 PMMA預聚物之起始劑配比及反應溫度相互影響效應 51
3-2-2 PMMA分子量分析 53
3-2-3 DSC 54
3-2-4 PMMA之光學性能 54
3-3 結論 55
3-4 參考文獻 56
第4章 光擴散劑對PMMA光學性能之影響效應 71
4-1 前言 72
4-2 實驗 74
4-2-1 材料 74
4-2-2 光擴散板之製造流程 75
4-2-3 光學視角之量測(Angle of view；AoV) 76
4-2-4 霧度計(Haze-Gard Plus 4726) 78
4-3 結果與討論 80
4-3-1 Prepolymer與ODA混摻之狀態 80
4-3-2 光擴散板之可視角影響效應 81
4-3-3 光擴散板之Haze，Transmittance，Clartity性能影響 82
4-4 結論 84
4-5 參考文獻 104
第5章 總論 106

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