A series of alkyl-functional naphthoxazine resins having various alkyl chain lengths from C1 to C18 are synthesized with a high yield and high purity by the reactions of 1,5-dihydroxynaphthalene, formaldehyde, and aliphatic amines. The proposed chemical structures of the naphthoxazines are confirmed by high-resolution mass spectrometry, H nuclear magnetic resonance spectroscopy, Fourier transfo...

Frontal polymerization is a process of converting a monomer into a polymer by means of a self-propagating thermal reaction wave. We study initiation of polymerization waves by a high temperature heat source. A five species reaction model is considered with a focus on the evolution of two of these species and the temperature of the mixture. The temperature is tracked from the inert heating to th...

Introduction. Polymerization of light-cured dental materials used for restoration of hard tooth tissue may lead to an increase in temperature that may have negative consequence for pulp vitality. Aim. The aim of this study was to determine maximum temperatures reached during the polymerization of selected dental materials, as well as the time that is needed for samples of sizes similar to those...

Vat polymerization, the earliest and most established 3D printing technology, offers abundant advantages of high-precision fabrication rapid speed, among others. This technology is often applied to fabricated objects with complex delicate structures, which are specific interest in numerous fields. However, it suffers from poor mechanical properties resultant printed parts due layer-by-layer man...

A benzoxazine containing a vinyl group (P-4va) was prepared by the reaction of phenol, 4-vinylaniline, and paraformaldehyde. A differential scanning calorimetry (DSC) study revealed that ring-opening polymerization of the benzoxazine and chain polymerization of the vinyl group occurred in the same temperature range. When 2,2'-azobisisobutyronitrile was added as a radical initiator to P-4va, how...

A series of fluorine-containing amphiphilic graft copolymers consisting of a semi-fluorinated poly(2methyl-1,4-bistrifluorovinyloxybenzene) (PMBTFVB) backbone and hydrophilic poly(acrylic acid) (PAA) side chains was synthesized by the combination of thermal cycloaddition polymerization and atom transfer radical polymerization (ATRP) through the grafting-from strategy. 2-Methyl-1,4-bistrifluorov...

New biodegradable network polymers containing siloxane-linked polymeric prodrugs of 5-ammino-2-hydroxybenzoic acid (5-ASA) in the main chain were prepared by ter polymerization of methacrylic acid (MA), 2-hydroxyethylmethacrylate (HEMA), and bis (trimethylsilyloxy) methylsilane (VBM) in the presence of some new cross-linking agents.The monomers and polymers were characterized by FT-IR and 1H-NM...

Transdermal patches loaded with pravastatin was previously characterized in another published study by Serrano-Castañeda et al; 2015. These transdermal patches (TP) were generated by the plate casting technique, the in vitro percutaneous absorption studies of TP were evaluated for three different formulations of TP with different quantities of Pluronic F-127 (PF-127): i) without PF-127 (TP W), ...

Abstract Frozen soil distributed over alpine cold regions causes obvious changes in the hydrothermal regime and influences water–heat exchanges between land atmosphere. In this study, by comparing effects of snow cover anomalies frozen thawing on regime, impact spring precipitation early summer Tibetan Plateau (TP) was investigated via diagnostic analysis model simulations. The results show tha...

Tropical cyclones entering coastal areas adversely affect southern China. However, changes in the frequency of tropical affecting west China remain unclear. Our study reveals possible impact thermal forcing anomaly over southeast Tibetan Plateau (TP) on Guangxi formed within 120° E during boreal summer. Further analysis indicates that cooling TP is accompanied by local descending motions southe...