The effect of physical adhesion promotion treatments on interfacial adhesion in cellulose-epoxy
Sanna SiljanderJani LehmonenAtsushi TanakaJukka A. KetojaPirjo HeikkiläMatti PutkonenJohanna LahtiEssi SarlinJyrki Vuorinen
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Promotion (chess)
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Dental ceramics
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Adhesive strength between epoxy resin floor coatings and cement mortar substrate is evaluated. Adhesive strength is constructed from specific adhesion and mechanical adhesion. First they are individually studied as the peel energy. Secondly in order to unify them , a mathematical equation that consists of work of adhesion and surface roughness, both of which can be measured experimentally , is proposed . By comparing the results calculated and measured , availability of the equation is discussed.
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ポリエチレン被覆鋼材のエポキシプライマー (アミン硬化系) 中のエポキシ基濃度が, 一次, 二次密着性に及ぼす影響を調べた。アミン系硬化剤をエポキシ当量から計算される当量配合した場合には, 樹脂系により異なる挙動をとったが, 2.8～3.8molkg-1のエポキシ基濃度範囲で, エポキシ基濃度の増加とともに接着強度, 2次密着性が向上する傾向を示した。アミン硬化剤の配合量を意図的に当量配合からずらしエポキシ濃度を変えた場合では, エポキシ基濃度の高い方が, 2.8～3.8molkg-1のエポキシ基濃度範囲で単調に一次, 二次密着性が向上した。見かけの破壊面は, エポキシプライマーと接着性ポリエチレン層間で, この部分の接着特性がエポキシ基と接着性ポリエチレンに変成されている無水マレイン酸の相互作用に大きく依存していると推定した。硬化剤配合量を減らして, 被覆特性の向上をはかる場合には, 90度剥離強度の温度依存性, 温塩水浸漬後の接着強度比率などから-20%以内にとどめるのがよい。以上から優れた密着性能を得るためには, エポキシプライマーのエポキシ樹脂としてエポキシ濃度の高いものを選択し, 硬化剤配合量を-20%程度, 当量配合から減じることが必要である。
Primer (cosmetics)
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Adhesive characteristic between epoxy resin floor coatings and cement paste substrate was discussed from a view point of interfacial chemistry. The fracture strength of adhesive joints was first measured and obtained peel energy for 4 kinds of substrate surfaces such as ordinary, drying, abrading and dense substrates. As for wettability, surface free energy of substrate and epoxy floor coatings was measured. The relation between the polar component of the surface free energy and the peel energy, and also the relation between the work of adhesion and the peel energy were investigated. It was found out that the peel energy closely related to the polar component of the surface free energy of substrate. Desirable condition to improve adhesive strength between epoxy resin floor coatings and cement-based substrate was finally proposed.
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Matrix (chemical analysis)
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アルミニウム/エポキシ樹脂界面の接着機構を量子化学計算により分子論的に解析した.アルミニウム表面および diglycidyl-ether of bisphenol A(DGEBA)の相互作用を考慮し,Al(OH)3/DGEBA のクラスターモデルを構築した.密度汎関数法による構造最適化計算から水素結合により両者が安定な接着構造をとることがわかった.続いて周期境界条件を満たす無限に広がる界面接着モデルを構築した.モデルの接着エネルギーを求め,DGEBA がアルミニウム表面に張り出したヒドロキシル基と複数の水素結合を形成することを明らかにした.接着剤・被着材を界面から垂直方向へ引き離しながら部分構造最適化を行い,移動距離に対するモデルの全エネルギーのプロットをとり,さらにエネルギーの引き離し座標に関する微分から被着材/接着剤間にはたらく接着力を算出した.その値が実験値と大きく矛盾しないことから,この系の接着が水素結合により起こることが示唆される.
Diglycidyl ether
Interface (matter)
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In epoxy/Al laminated composites, the interface between polymers and metals plays the role of load transfer from epoxy to Al. However, the interfacial bonding between epoxy and aluminum tends to be weak. In this paper, in order to improve the interfacial strength the dendrimer layer—poly (amido amine) (PAMAM) was used to realize the amino functionalization of the interface of epoxy/Al laminated composites. The amino functionalization was tuned by controlling the hydroxyl group concentration through different Al surface treatments. The results show the interfacial adhesion strength between aluminum and epoxy was highly dependent of amino group content. The adhesion strength of epoxy/Al interface is increased by 50% after PAMAM layer was introduced into the NaOH-treated interface between epoxy and Al surface.
Surface Modification
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Epoxy adhesive was modified by mechanical mixing with nanoparticles. Then the adhesion strength between metal and nano-modified epoxy adhesive was tested. The results of pull-off adhesion tests indicated that the adhesion strength of them showed different degrees of increase with the variety of nanoparticles' kind and content. Furthermore,the adhesion strength of steel substrate and epoxy adhesive added in 2% nano-Al2O3 was visibly improved by about 4 times. The mechanisms and reasons were analyzed and discussed by observing the joint's fracture morphology and testing the adhesion strength of the nano-modified system with different roughness of steel surface.
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This research aimed to produce foams with properties of good adhesion. Blend-modified epoxy/polyurethane foam was synthesized by step-preparation method. The effect of epoxy mass fraction on the foam adhesion and the changing pattern of adhesion property were studied. The performance of adhesion, internal structure and thermal stability of the foam were characterized. The results showed that the mass fraction of epoxy had great effect on the adhesion property of the foam. The optimal adhesive property and the thermal stability were obtained when the mass fraction of epoxy was 50%, and the epoxy/polyurethane foam developed a structure of interpenetrating polymer networks.
Mass fraction
Thermal Stability
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