Residence structures, systems, and related methods are generally provided. Certain embodiments comprise administering (e.g., orally) a residence structure to a subject (e.g., a patient) such that the residence structure is retained at a location internal to the subject for a particular amount of time (e.g., at least about 24 hours) before being released. The residence structure may be, in some cases, a gastric residence structure. In some embodiments, the structures and systems described herein comprise one or more materials configured for high levels of active substances (e.g., a therapeutic agent) loading, high active substance and/or structure stability in acidic environments, mechanical flexibility and strength in an internal orifice (e.g., gastric cavity), easy passage through the GI tract until delivery to at a desired internal orifice (e.g., gastric cavity), and/or rapid dissolution/degradation in a physiological environment (e.g., intestinal environment) and/or in response to a chemical stimulant (e.g., ingestion of a solution that induces rapid dissolution/degradation). In certain embodiments, the structure has a modular design, combining a material configured for controlled release of therapeutic, diagnostic, and/or enhancement agents with a structural material necessary for gastric residence but configured for controlled and/or tunable degradation/dissolution to determine the time at which retention shape integrity is lost and the structure passes out of the gastric cavity. For example, in certain embodiments, the residence structure comprises a first elastic component, a second component configured to release an active substance (e.g., a therapeutic agent), and, optionally, a linker. In some such embodiments, the linker may be configured to degrade such that the residence structure breaks apart and is released from the location internally of the subject after a predetermined amount of time.

Clearcoat compositions and methods for forming a clearcoat compositions are provided. In one example, a clearcoat composition includes a binder portion A that includes a polyaspartic ester resin. An activator portion B includes a polyol-modified isocyanate that is a reaction product of a polyisocyanate component and a polyol component. The polyol component includes polycaprolactone polyol.

A holographic recording medium composition comprising component (e): a compound having an isocyanate group or an isocyanate-reactive functional group and further having a nitroxyl radical group, wherein component (e) contains component (e-1) below: component (e-1): a compound having a heterobicyclic ring structure or a heterotricyclic ring structure, the heterobicyclic ring structure or the heterotricyclic ring structure being obtained by replacing a carbon atom in a bicyclic ring structure or a tricyclic ring structure by the nitroxyl radical group.

A charging member may include a surface layer. The surface layer may include a urethane resin, an electron conducting agent, an azo-based metal complex compound, and a quaternary ammonium salt.

Described herein are thermoset compositions and kits of compositions suitable for use in additive fabrication processes including high concentrations of urethane methacrylate oligomers having at least one polymerizable group, and a number average molecular weight from 750 to 4000 g/mol, an effective quantity of a monofunctional reactive diluent monomer, a defined concentration of a network building agent having a molecular weight that is lower than the urethane methacrylate oligomer, optionally a photoinitiator, and optionally, additives. Also disclosed are methods of creating three-dimensional parts via additive fabrication processes utilizing urethane methacrylate oligomer-centric compositions, wherein various exposure irradiances, cure temperatures, and oxygen content levels are prescribed, as well as the articles cured therefrom.

Provided is a moisture curable polyurethane composition that is a moisture curable polyurethane having an isocyanate group on one end of a molecule thereof. The moisture curable polyurethane composition contains a moisture curable polyurethane (A) and an organic solvent (B). The moisture curable polyurethane (A) is obtainable by reacting a polyisocyanate compound having at least two isocyanate groups in a molecule thereof (A1) with a low-molecular weight polyol compound having at least two hydroxyl groups in a molecule thereof and having a number average molecular weight of 50-300 (A2). Also provided is a laminate including an optical substrate and a polyurethane resin layer comprising the moisture curable polyurethane composition.

Described herein is a polyurethane including a reaction product of an isocyanate component, a polyol component, and graphene nano platelets. The graphene nano platelets are reacted in an amount of from about 0.1 to about 20% by weight, based on a total weight of the polyurethane. The graphene nano platelets have an average lateral dimension (x, y) of from about 1 to about 100 μm, an average through-plane dimension (z) of from about 5 to about 100 nm, and an oxygen content of from about 0.01 to about 10% by weight, based on a total weight of the graphene nano platelets.

A shape-memory polymer that is melt-recyclable with high processability and little performance loss, in contrast to known Crosslinked semicrystalline shape-memory networks that are capable of storing large amounts of elastic energy with negligible plastic deformation but as thermosets are not easily melt-processed or recycled. In examples herein, catalyst-free isocyanate chemistry is used to prepare two linear poly(caprolactone)s with bisurea hydrogen bonding groups periodically positioned along the main chain. Compared to an entangled poly(caprolactone) homopolymer of similar molecular weight, the segmented poly(bisurea)s exhibit minimal stress relaxation when elastically strained at identical conditions. Furthermore, the materials' single relaxation times indicate chain reptation, and at sufficient temperatures, disentanglement occurs rapidly enough to perform melt-processing. The polymers show excellent shape fixity and recovery before and after shredding, melt-pressing, and annealing into a reprocessed film.

A process for preparing a polymeric membrane for materials used in crop production comprising: a) providing an aqueous dispersion of a polyurethane or polyurethane-urea elastomer comprising segments formed from the copolymer segment of Formula I
A.sup.1-[Y.sup.1].sub.n-L-[Y.sup.2].sub.q-A.sup.2  Formula I
wherein A.sup.1 is an end capping group; A.sup.2 is hydrogen or an end capping group; each [Y.sup.1].sub.n and [Y.sup.2].sub.q is independently selected from a polyether macrodiol, polycarbonate macrodiol, polyester macrodiol, and wherein at least one of [Y.sup.1].sub.n and [Y.sup.2].sub.q is a polyester macrodiol; L is a divalent linking compound independently selected from urethane, urea, carbonate, ester, and phosphonate; n is an integer of 2 to 50; q is an integer of 2 to 50; and b) spraying the aqueous dispersion onto materials to be used in crop production to form a polymeric membrane on the materials.

The invention is directed to a biodegradable, phase separated, thermoplastic multi-block copolymer, to a process for preparing a biodegradable, phase separated, thermoplastic multi-block copolymer, to the use of a biodegradable, semi-crystalline, phase separated, thermoplastic multi-block copolymer, and to a composition for the delivery of at least one biologically active compound to a host.

The biodegradable, phase separated, thermoplastic multi-block copolymer of the invention comprises at least one amorphous hydrolysable pre-polymer (A) segment and at least one semi-crystalline hydrolysable pre-polymer (B) segment, wherein said multi-block copolymer under physiological conditions has a T.sub.g of 37° C. or less and a T.sub.m of 50-110° C.; the segments are linked by a multifunctional chain extender; the segments are randomly distributed over the polymer chain; and the pre-polymer (B) segment comprises a X-Y-X tri-block, wherein Y is a polymerisation initiator, and X is a poly(p-dioxanone) segment with a block length expressed in p-dioxanone monomer units of 7 or more.