This invention relates to chemical polymer compositions, methods of synthesis, and fabrication methods for devices regarding polymers capable of displaying shape memory behavior (SMPs) and which can first be polymerized to a linear or branched polymeric structure, having thermoplastic properties, subsequently processed into a device through processes typical of polymer melts, solutions, and dispersions and then crossed linked to a shape memory thermoset polymer retaining the processed shape.

Shape memory polymers and copolymers are based on poly(hydroxyalkanoates) (PHA) and have improved elastomeric properties. The shape memory polymers and copolymers may be used as protective, reinforcement, cladding or embellishment material having mechanical properties enabling substitution to materials based on technical polymers such as plasticized PVC and polyolefins.

Disclosed are a two-way shape memory polyurethane and a preparation method thereof. The two-way shape memory polyurethane includes the following components: in parts by weight, 4 parts to 36 parts of hydroxyl-terminated polybutadiene, 35 parts to 85 parts of hydroxyl-terminated polycaprolactone, 7 parts to 21 parts of a diisocyanate, 15 parts to 45 parts of polyethylene glycol, and 4 parts to 10 parts of a cross-linking agent.

Some embodiments relate to a dual cure polymerization system combining aza-Michael addition polymerization and photopolymerization. Some embodiments also relate to a dual cure polymerization system for preparing interpenetrating polymer networks. Some other embodiments relate to compositions and articles obtainable by a process of the invention and uses thereof.

A kind of green tea memory foam and its fabricating method comprises the following components at the weight ratio of 4045 percent of polyether polyol A, 2535 percent of polyether polyol B, 2030 percent of toluene diisocyanate, 13 percent of green tea powder, 0.52 percent of water, 0.010.1 percent of silicone oil, 0.010.03 percent of ammonia, 0.010.03 percent of stannous octoate, and 0.0050.015 percent of mill base. The present invention belongs to the technical field of memory foam, particularly the memory foam with a fragrance of green tea which can effectively remove the unpleasant chemical smell with a natural smell of green tea to further improve the quality of sleep.

Tumor resection is commonly practiced to prevent the progression of cancer. However, there are post-surgery concerns including the formation of a void that can allow cancer cells to escape at the surgery site, which increases the risk of metastasis. To counter this challenge, an embodiment includes a polyurethane-based shape memory foam as a tissue void-filling device that can also release anti-cancer drugs. Such foams may activate at body temperature and become malleable. Such properties may enable the foam to be shaped to precisely seal the tissue void and then serve as a drug-eluting device. Based on the drug composition with poly vinyl alcohol (PVA), the drug release profile from the foam may be altered depending on the application.

New shape memory polymer compositions, methods for synthesizing new shape memory polymers, and apparatus comprising an actuator and a shape memory polymer wherein the shape memory polymer comprises at least a portion of the actuator. A shape memory polymer comprising a polymer composition which physically forms a network structure wherein the polymer composition has shape-memory behavior and can be formed into a permanent primary shape, re-formed into a stable secondary shape, and controllably actuated to recover the permanent primary shape. Polymers have optimal aliphatic network structures due to minimization of dangling chains by using monomers that are symmetrical and that have matching amine and hydroxl groups providing polymers and polymer foams with clarity, tight (narrow temperature range) single transitions, and high shape recovery and recovery force that are especially useful for implanting in the human body.

This invention relates to a process for preparing viscoelastic polyurethane foam in which the isocyanate-reactive component comprises a specific polyol blend, and to viscoelastic polyurethane foam wherein the isocyanate-reactive comprises the specific polyol blend. The polyol blend may be an in situ formed polyol blend.

Disclosed is a curable resin composition that includes radical polymerizable monomers including a monofunctional radical polymerizable monomer, a linear or branched polymer containing a polyoxyalkylene chain, and a radical polymerization initiator.

The present invention relates to an article consisting of or comprising a bidirectional shape-memory polymer (bSMP), the bSMP comprising: first phase-segregated domains (AD) having a first transition temperature (T.sub.t,AD) corresponding to a crystallization transition or glass transition of the first domains (AD), second phase-segregated domains (SD) having a second transition temperature (T.sub.t,SD) corresponding to a crystallization transition or glass transition of the second domains (SD), the second transition temperature (T.sub.t,SD) being higher than the first transition temperature (T.sub.t,AD), and covalent or physical bonds cross-linking the polymer chains of the bSMP, and in this way interconnecting the first and second domains (AD, SD), wherein the second phase-separated domains (SD) form a skeleton which is at least partially embedded in the first phase-segregated domains (AD), and wherein polymer chain segments of the bSMP forming the first domains (AD) are substantially orientated in a common direction, such that the bSMP is able to undergo a reversible shape-shift between a first shape (A) at a first temperature (T.sub.high) and a second shape (B) at a second temperature (T.sub.low) upon variation of temperature between the first and second temperature (T.sub.high, T.sub.low) driven by the crystallization and melting or vitrification and melting of the first phase-separated domains (AD) and without application of an external stress, with T.sub.low<T.sub.t,AD<T.sub.high<T.sub.t,SD.