Komposit sandwich adalah jenis komposit yang mempunyai kekuatan tinggi apabila digunakan sebagai struktur primer maupun sekunder. juga memiliki kelebihan dari sifat mekaniknya, tahan korosi, massa kecil dan proses pembuatannya sederhana. Penelitian ini bertujuan untuk menyelidiki pengaruh variasi fraksi volume lapisan kulit serat aren dengan inti limbah gergaji kayu sengon laut terhadap bending...

The high diastereoselectivity in the Michael addition of nitromethane to α,β-unsaturated γ-amino esters, crystal conformations of β-nitromethane substituted γ-amino acids and peptides are studied. Results suggest that the N-Boc protected amide NH, conformations of α,β-unsaturated γ-amino esters and alkyl side chains play a crucial role in dictating the high diastereoselectivity of nitromethane ...

The present study introduces two quantitative parameters to compare the accuracy of ultrasonic C-scan testing and X-ray radiography methods in the damaged area detection under low-velocity impact in polymer-based composites. For this purpose, the hand lay-up technique of composite processing was employed to prepare the composite specimen. A composite specimen consisting of the glass fiber reinf...

A composite materials were prepared using a polymeric blend of epoxy resin and unsaturated polyester as matrix material, nanoceramic powder Lead Zirconium Titanate reinforcement material in different adding ratios( 2wt % & 6wt ). Impact strength, surface hardness, thermal conductivity solutions absorption tests carried out for the samples. The pre-immersion results showed that ceramic to improv...

The increasing demands placed upon structural thermosets, such as epoxy and unsaturated polyester (UP), ever-increasing regulations for fire safety, have driven the development of high-performance ecofriendly fire-retardant thermoset polymers. This review provides a historical overview UP that aims to state-of-the-art design efficiency strategies developed in last decade, pave way developing ne...

An unsaturated polyester resin (UPR) mortar was applied to repair the damage tension zone's one-way reinforced concrete (RC) slabs. The load carrying capacity of patched RC slab is interest justify effectiveness repair. Yield Line Theory (YLT) may be used estimate slabs under concentrated load. results YLT are compared with experimental evaluate validity method. confirm that patching alters yie...