LCD 3D Baskı için TDI Bazlı Üretan Diakrilat Takviyeli Silikon Akrilat Reçineler

Öz

Bu çalışmada, daha önce yapılan çalışmalarda test edilen kontrol numunesi (Si-HTH0) olarak, silikon diakrilat ve dipropilen glikol diakrilat (DPGDA) 1:1 oranında formüle edilmiştir. Mekanik özellikleri iyileştirmek amacıyla, yeni bir diakrilat monomeri olan HEMA ile sonlandırılmış TDI bazlı üretan (HTH), toluen diizosiyanat (TDI) ile 2-hidroksietil metakrilat (HEMA) reaksiyona sokularak sentezlenmiştir. Sentezlenen monomer, farklı konsantrasyonlarda (%20–%100) DPGDA ile karıştırılarak silikon diakrilat reçinesine entegre edilmiştir. Mekanik karakterizasyon sonuçları, çekme mukavemeti, Young modülü, darbe dayanımı ve sertlik açısından önemli iyileşmeler göstermiştir. %60 HTH içeriğine sahip numune (Si-HTH60), optimum mekanik özellikleri sergileyerek, nihai çekme mukavemetinde %393’lük bir artış, %11,87 kopma uzaması ve 3,7 kJ/m² darbe dayanımı elde etmiştir. SEM analizi, Si-HTH60'ın test edilen numuneler arasında en sünek kırılma morfolojisine sahip olduğunu göstermiş, ayrıca yüzeyde pürüzlülüğün artmasının yanı sıra belirgin bir nehir benzeri (river-like) desen ve derin kırılmaların varlığı, darbe enerjisi emiliminin arttığını ortaya koymuştur. Buna karşılık, %100 HTH içeren numune, lifli ve hafif gözenekli bir yapı sergileyerek en yüksek çekme mukavemeti ve modül değerlerine ulaşmış, ancak darbe dayanımı açısından üstünlük göstermemiştir. Bu bulgular, HTH'nin silikon diakrilat bazlı reçinelerin mekanik performansını artırmadaki etkinliğini ve DLP/LCD 3D baskı uygulamaları için potansiyelini vurgulamaktadır.

Anahtar Kelimeler

• HEMA ile sonlandırılmış TDI bazlı üretan
• silikon diakrilat reçinesi
• reaktif seyreltici
• mekanik performans
• DLP/LCD 3B baskı

TDI-Based Urethane Diacrylate Reinforced Silicon-Acrylate Resins for LCD 3D Printing

Öz

In this study, silicon acrylate resins were formulated using a 1:1 ratio of silicon diacrylate and dipropylene glycol diacrylate (DPGDA) as the control sample (Si-HTH0), previously tested in earlier work. To enhance mechanical properties, a novel diacrylate monomer, HEMA-terminated TDI-based urethane (HTH), was synthesized by reacting toluene diisocyanate (TDI) with 2-hydroxyethyl methacrylate (HEMA). The synthesized monomer was blended with DPGDA at varying concentrations (20–100%) and integrated into the silicon diacrylate resin. Mechanical characterization revealed significant improvements in tensile strength, Young’s modulus, impact resistance, and hardness. At 60% HTH (Si-HTH60), the material exhibited the best balance of properties, with a 393% increase in ultimate tensile strength, 11.87% elongation at break, and 3.7 kJ/m² impact resistance. SEM analysis confirmed that Si-HTH60 displayed the most ductile fracture morphology among the tested samples, characterized by rougher surfaces, a distinct river-like pattern, and deep fractures, indicating enhanced energy absorption. In contrast, the 100% HTH sample exhibited a unique morphology with a fibrous and slightly porous structure, leading to the highest tensile strength and modulus, though without superior impact resistance. These findings highlight HTH’s effectiveness in enhancing silicon acrylate-based resins for advanced DLP/LCD 3D printing applications.

Anahtar Kelimeler

• HEMA-terminated TDI-based urethane
• silicon diacrylate resin
• reactive diluent
• highly improved mechanical properties
• DLP/LCD 3D printing

Kaynakça

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