本論文第一部分為抗黃化高分子之開發，因應產業的需求，增進塗料耐用性仍為需持續發展之方向，其黃化主因為日光中紫外線光解反應，因此，本研究以氧化石墨烯或表面改質氧化石墨烯接枝於聚甲基丙烯酸甲酯(PMMA)，以氧化石墨烯吸收紫外線的特性來改善黃化的問題。先針對氧化石墨烯表面改質，以提高其分散性，再以自由基共聚合方式，合成適當分子量之氧化石墨烯/PMMA共聚物，針對塗料特性及氧化石墨烯的性質，如：氧化石墨烯改質後分散性、氧化石墨烯對紫外光的吸收性、共聚高分子之抗黃化性、熱穩定性、耐鹽性等進行研究與反應機制分析。本研究發現改質氧化石墨烯/PMMA薄膜的紫外光吸收性較佳，可增進其抗黃化性質，且其塗佈於鐵材後也可增加其耐鹽性。
本論文之第二主題為開發矽膠型導電膠，隨著各類通訊、電子設備及產品的發展，需降低電磁波對電子元件的影響，故需發展高效率且熱穩定性高的電磁波屏蔽材料。在此研究以矽氧樹脂與銀銅粉製備導電膠之程序，製程中使用片狀及球狀銀銅粉，添加於矽氧樹脂中，並調整其他添加物含量，包含溶劑、矽烷偶聯劑、補強劑等，分析各參數對導電性質、電磁屏蔽與結構強度的影響，並找出最適化配方及製程。實驗結果顯示導電銀膠中導電粒子固含量須達70 wt%，而加入適量溶劑可使導電粒子於矽膠內形成導電通路，並以恆溫攪拌增加導電粒子的分散性，最後以加壓抽氣過濾移除多餘溶劑可製備出電阻低於0.45 Ω以及電磁屏蔽效果達80 dB之導電膠，符合實際商品之需求。

The first topic of this thesis is the development of polymer with anti-yellowing property. The development of durable paint is investigated continuously to meet industrial needs. The yellowing phenomenon over paint is resulted from the UV-photolysis of polymer. In this study, graphene oxide and surface-modified graphene oxide were grafted onto polymethyl methacrylate (PMMA) to improve its yellowing resistance due to the graphene oxide exhibits the excellent UV-absorption property. The work was divided into three stages. Firstly, the graphene oxide was modified with glycidyl methacrylate to improve its degree of dispersion. Secondly, the graphene/PMMA copolymer with an appropriate molecular weight was synthesized via a free-radical copolymerization method. Finally, the characteristics of the copolymer coatings and properties of modified graphene oxide were studied in detail, such as dispersion, absorption of ultraviolet light, yellowing resistance, thermal stability, and salt resistance. The results showed that the modified graphene oxide/PMMA film with obvious UV-absorption property exhibited the good yellowing resistance reasonably. Moreover, this copolymer coating also improved the salt resistance of iron plates.
The silicone conductive paste was the second topic of this thesis. The influence of electromagnetic waves on electronic components need to be reduced for the enhancement of stability and operation speed for various types of communications, electronic devices and products. Therefore, the development of electromagnetic shielding materials with high efficiency and thermal stability is an important issue. The preparation procedure of conductive paste with using silicone resin and silver-coated copper powder was investigated herein. The silver-coated copper powder with flake and spherical shape were respectively added to the silicone resin, and the contents of other additives were adjusted to obtain the optimal formula and process. The effects of solvents, silane coupling agents, reinforcing agents and manufacture process on conductive properties, electromagnetic shielding, and structural strength were studied systematically. It was found that the content of silver-coated copper powder should be more than 70 wt% for good conductive property. The conductive path made of conductive particles will be formed in the silicone rubber in the presence of appropriate amount of solvent. The dispersion of conductive particles was increased by using an isothermal agitation device. After using the pressurized filtration to remove the excess solvent, a conductive paste with a resistance less than 0.45 Ω and an electromagnetic shielding effect of 80 dB can be obtained, which is meet the industrial specification.

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