A method of forming a three-dimensional object is carried out by: (a) providing a cyanate ester dual cure resin; (b) forming a three-dimensional intermediate from said resin, where said intermediate has the shape of, or a shape to be imparted to, said three-dimensional object, and where said resin is solidified by exposure to light; (c) optionally washing the three-dimensional intermediate, and then (d) heating and/or microwave irradiating said three-dimensional intermediate sufficiently to further cure said resin and form said three-dimensional object. Compositions useful for carrying out the method, and products made from the method, are also described.

The present invention exploits reactive organophosphorus compounds containing unsaturated vinyl groups, which can be used in a flexible and highly controlled manner to prepare various macromolecular derivatives either via radical reactions or via Michael addition with suitable nucleophiles. Based on the fact that secondary amine groups on the one hand and vinyl groups on the other hand can work as mutual linking sites, an arsenal of novel and useful addition products can be built up. By selecting the number of secondary amine sites and vinyl sites of the participating reaction partners, very different addition products can be formed. In particular, one can form either linear chain type macromolecules (i.e. linear oligomers or polymers) or highly crosslinked network polymers.

In some embodiments, a product, such as a thermoset, has a polyhexahydrotriazine and a self-polymerized cross-linkable polymer. In some embodiments, a product is the reaction product of a diamine, an aldehyde, and a compound having an ?,?-unsaturated electron withdrawing moiety.

Materials and methods for preparing a modified poly(hexahydrotriazines) (PHTs) polymers and modified polyhemiaminals (PHAs) are provided. A monomer precursor, a photochromic precursor, and a formaldehyde material may be combined to form a photochromic polymer. The photochromic polymer may comprise hexahydrotriazine, hemiaminal, polyhexahydrotriazine, polyhemiaminal, or a combination thereof.

With a photocurable composition for film formation which comprises a polymer containing a repeating unit structure having a triazine ring, for example, one represented by the following formula (17), a crosslinking agent, an ultraviolet absorber, and a light stabilizer, it is possible to produce a cured film which has a high refractive index and satisfactory weatherability ##STR00001##

Disclosed herein are monomer embodiments that can be used to make polymers, such as homopolymers, heteropolymers, and that can be used in particular embodiments to make sequence-defined polymers. Also disclosed herein are methods of making polymers using such monomer embodiments. Methods of using the polymers disclosed herein also are described.

Materials and methods for preparing a modified poly(hexahydrotriazines) (PHTs) polymers and modified polyhemiaminals (PHAs) are provided. A monomer precursor, a photochromic precursor, and a formaldehyde material may be combined to form a photochromic polymer. The photochromic polymer may comprise hexahydrotriazine, hemiaminal, polyhexahydrotriazine, polyhemiaminal, or a combination thereof.

A resin film is provided. When the resin film is characterized by Fourier transform infrared spectroscopy (FTIR), the Fourier transform infrared spectrum of the resin film has a signal intensity A from 2205 cm.sup.?1 to 2322 cm.sup.?1 and a signal intensity B from 1472 cm.sup.?1 to 1523 cm.sup.?1, and 0.70?A/B?1.95.

Ternary resin blends which can be cured in order to form a cured resinous material for use as a matrix in composite materials. The ternary resin blends comprise a polyfunctional cyanate ester, an asymmetric bisphenol-derived cyanate ester, and a compound of formula (I) wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 and R.sub.6 are as defined in the specification. A cured resinous material prepared by curing a ternary resin blend, a composite material comprising said cured resinous material, an article comprising said cured resinous material or said composite material, and methods for making the ternary resin blends, cured resinous materials, composite materials and articles are also disclosed.

The present invention relates to a high-temperature resistant modified silicon-containing cyanate ester resin as well as a preparation method and an application thereof. The preparation method comprises the following steps: adding a mixed solution of hydroxyl silicone oil, a silane coupling agent and an organic solvent into a mixed solution of a tetramethylammonium hydroxide aqueous solution and a polar solvent, performing hydrolytic polycondensation at a temperature of 5-40 C. for 4-8 h, and performing distillation to obtain an epoxy-containing silsesquioxane; performing pre-polymerization on the epoxy-containing silsesquioxane and a cyanate ester resin at a temperature of 50-100 C. for 1-8 h to obtain a modified cyanate ester resin; and uniformly mixing the modified cyanate ester resin and a modified anhydride, thereby obtaining the high-temperature resistant modified silicon-containing cyanate ester resin.