MO XF, FAN DB, QIN TF & CHU FX. 2015. Curing characteristics and adhesion performance of phenol–formaldehyde resins with composite additives. The curing characteristics of cure-accelerated phenol–formaldehyde resins with composite additives were investigated by differential scanning calorimetry analysis and gelation test. The pot lives and adhesion performances of phenol–formaldehyde resins wer...

Any views expressed in this publication are those of the authors. They do not necessarily represent the views of CIFOR, the authors' institutions or the financial sponsors of this publication. Contents Abbreviations vi Acknowledgements vii Foreword viii 1 Challenges and forest-based opportunities in the drylands of Ethiopia 1 1.1 Drylands of Ethiopia 1 1.2 Challenges facing the drylands of Ethi...

STATEMENT OF PROBLEM Acrylic resins are prone to microbial adherence, especially by Candida albicans. Surface-charged resins alter the ionic interaction between the denture resin and Candida hyphae, and these resins are being developed as a means to reduce microbial colonization on the denture surface. PURPOSE The purpose of this study was to investigate the physical and mechanical properties...

Resins for crown and bridge have been widely used as veneers on rnetal frames to provide restorations of anterior teeth because the reproducibility of the aesthetics appearances is relative}y easyi-6), The reason would be that their materials have good handling, such as an arbitrary working time and short setting time due to the light-curing system, and also have the advantage of comparatively ...

OBJECTIVE To examine the feasibility of dimethyl sulfoxide (DMSO) incorporation into relatively hydrophilic resins as a new potential method to improve the durability of resin-dentin bonds. METHODS Six experimental light-curing BisGMA/HEMA resins solvated in ethanol and DMSO with increasing concentrations of DMSO (0, 0.5, 1, 2, 4 and 10wt%) were prepared. The degree of conversion (DC) was eva...

The addition of different polymers, such as polytetrafluorethylene (PTFE), to denture base resins could be an option to modify acrylic resin mechanical properties. This study evaluated the surface hardness, impact and flexural strength, flexural modulus and peak load of 2 acrylic resins, one subjected to a long and another subjected to a short polymerization cycle, which were prepared with or w...

Urea formaldehyde resins were formulated with vatiables of three reaction pHs (1.0, 4.8, and 8.0 5.0) and three catalysts (sodium hydroxide, sodium hydroxide/ammonium mix, and triethanolamine) . The resins were prepared by placing all formaldehyde and water in reaction kettle and pH was adjusted with sulfnric acid and sodium hydroxide, respectively. Urea was added in 1.5 equal parts at 1 minute...

Hydrophobic charge-induction chromatography (HCIC) is a novel technology for antibody purification. The ligand densities and pore properties of HCIC resins have significant effects on the separation behavior of protein, however, the understandings are quite limited. In the present work, new HCIC ligand, 2-mercapto-1-methylimidazole (MMI) was coupled to three agarose matrices with different pore...

OBJECTIVES The absorption of water by acrylic resins is a phenomenon of considerable importance since it is accompanied by dimensional changes, a further undesirable effect of absorbed water in acrylic resins to reduce the tensile strength of the material. Solubility is also an important property because it represents the mass of soluble materials from the polymers. METHODS Ten acrylic resin-...

Clay nanocomposites have been synthesized by UV-curing with organic and waterbased resins. The effect of the chemical structure of the organophilic layer of the clay on the dispersibility in the photocurable resins, the photocuring efficiency and the final properties of the UV-cured nanocomposites are discussed.