Synthesis and Properties of a Photopolymerizable Carbene-Mediated Poly Phosphinate Flame Retardant by Carbene Polymerization

A novel photopolymerizable poly phosphinate (poly ethyl (4-acrylamidebenzyl)­phosphinate, P-NH-AC) flame retardant was synthesized by a carbene polymerization and characterized using Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance spectroscopy (NMR), and gel permeation chromatography (GPC). The effect of P-NH-AC on the kinetics of photopolymerization, thermal stability, combustion behaviors, and physical and mechanical properties of the UV-cured materials were investigated by real-time infrared spectroscopy (RT-IR), thermogravimetric analysis (TGA), thermogravimetric analysis/infrared spectrometry (TGA-IR), the limiting oxygen index (LOI), and the cone calorimetric test (CCT). For the systems with P-NH-AC, the thermal stability was improved with the increase of the P-NH-AC; however, the final residue of all systems was low. The addition of 5% P-NH-AC increased the LOI from 29.0 to 32.0. The addition of P-NH-AC significantly decreased the heat release rate (HRR), total heat release (THR), and total smoke production (TSP) of the resin. Moreover, P-NH-AC can also improve physical and mechanical properties of the materials

Photocured Materials with Self-Healing Function through Ionic Interactions for Flexible Electronics

Photocured materials with self-healing function have the merit of long lifetime and environmentally benign preparation process and thus find potential applications in various fields. Herein, a novel imidazolium-containing photocurable monomer, (6-(3-(3­(2-hydroxyethyl)-1<i>H</i>-imidazol-3-ium bromide)­propanoyloxy)­hexyl acrylate, IM-A), was designed and synthesized. Self-healing polymers were prepared by fast photocuring with IM-A, isobornyl acrylate, 2-(2-ethoxyethoxy)­ethyl acrylate, and 2-hydroxyethyl acrylate as the monomers. The mechanical and self-healing properties of the polymers were tuned by varying the contents of IM-A and other monomers. The as-prepared self-healing polymer IB7-IM5 exhibited a tensile strength of 3.1 MPa, elongation at break of 205%, healing efficiency of 93%, and a wide healing temperature range from room temperature to 120 °C. The self-healing polymer was also employed as a flexible substrate to fabricate a flexible electronic device, which could be healed and completely restore its conductivity after the device was damaged

Photocured Materials with Self-Healing Function through Ionic Interactions for Flexible Electronics

Photocured materials with self-healing function have the merit of long lifetime and environmentally benign preparation process and thus find potential applications in various fields. Herein, a novel imidazolium-containing photocurable monomer, (6-(3-(3­(2-hydroxyethyl)-1<i>H</i>-imidazol-3-ium bromide)­propanoyloxy)­hexyl acrylate, IM-A), was designed and synthesized. Self-healing polymers were prepared by fast photocuring with IM-A, isobornyl acrylate, 2-(2-ethoxyethoxy)­ethyl acrylate, and 2-hydroxyethyl acrylate as the monomers. The mechanical and self-healing properties of the polymers were tuned by varying the contents of IM-A and other monomers. The as-prepared self-healing polymer IB7-IM5 exhibited a tensile strength of 3.1 MPa, elongation at break of 205%, healing efficiency of 93%, and a wide healing temperature range from room temperature to 120 °C. The self-healing polymer was also employed as a flexible substrate to fabricate a flexible electronic device, which could be healed and completely restore its conductivity after the device was damaged

Photocured Materials with Self-Healing Function through Ionic Interactions for Flexible Electronics

Photocured materials with self-healing function have the merit of long lifetime and environmentally benign preparation process and thus find potential applications in various fields. Herein, a novel imidazolium-containing photocurable monomer, (6-(3-(3­(2-hydroxyethyl)-1<i>H</i>-imidazol-3-ium bromide)­propanoyloxy)­hexyl acrylate, IM-A), was designed and synthesized. Self-healing polymers were prepared by fast photocuring with IM-A, isobornyl acrylate, 2-(2-ethoxyethoxy)­ethyl acrylate, and 2-hydroxyethyl acrylate as the monomers. The mechanical and self-healing properties of the polymers were tuned by varying the contents of IM-A and other monomers. The as-prepared self-healing polymer IB7-IM5 exhibited a tensile strength of 3.1 MPa, elongation at break of 205%, healing efficiency of 93%, and a wide healing temperature range from room temperature to 120 °C. The self-healing polymer was also employed as a flexible substrate to fabricate a flexible electronic device, which could be healed and completely restore its conductivity after the device was damaged

Synthesis and characterization of photosensitive-fluorosilicone–urethane acrylate prepolymers

<div><p>Two kinds of novel photosensitive-fluorosilicone–urethane acrylate prepolymers (Si-F15-IPDI-HEA/Si-F6-IPDI-HEA) were synthesized and characterized. Si-F15-IPDI-HEA and Si-F6-IPDI-HEA were able to form homogeneous mixtures with a number of acrylate monomers. Formulations with these prepolymers with common acrylic monomers exhibited high-polymerization rates and final double-bond conversion over 90% after irradiation for 60 s. It was found the final conversion decreased with the increase of the functionality of the monomer. The influence of the monomer and prepolymers on the properties of the UV-cured films was systematically studied. Thermostability property along with mechanical performance was improved with the increase of the functionality of monomers and prepolymers. A decrease of water absorption was also observed through water contact angle measurements. The UV-cured films of Si-F15-IPDI-HEA and Si-F6-IPDI-HEA possessed an excellent adhesion on the PU and PVC leather, providing a potential application in leather industry as a finishing and coating agent.</p></div

Synthesis and Properties of Photosensitive Silicone-Containing Polyurethane Acrylate for Leather Finishing Agent

A photosensitive silicone-containing polyurethane acrylate prepolymer (Si-IPDI-HEA) was synthesized and characterized adequately by FTIR, ¹H NMR, and GPC analyses. The effect of the monomers on the photopolymerization kinetics of Si-IPDI-HEA was investigated by real-time infrared spectroscopy (RT-IR). The results showed that the resin of Si-IPDI-HEA with common acrylic monomers exhibited a high polymerization rate and double-bond conversion. The influence of the monomer and silicone on the microstructure and properties of the UV-cured film also was systematically studied. It was found that, with the increase of the functionality of the monomer, the thermostability, <i>T</i>_g, hardness, tensile strength, tensile modulus, and dispersion surface energy of the UV-cured film were increased, whereas the contact angle and elongation at break were decreased. The introduction of silicone into the prepolymer could enhance the thermostability of the UV-cured film, and reduce the dispersion surface energy by the change of the microstructure. More importantly, the leather finishing agent containing Si-IPDI-HEA has excellent comprehensive performance and potential application in the leather finishing agent

Synthesis and Performances of UV-Curable Polysiloxane–Polyether Block Polyurethane Acrylates for PVC Leather Finishing Agents

A series of multifunctional UV-curable polysiloxane–polyether block polyurethane acrylates prepolymers (TSi¹E⁹PUA, TSi³E⁷PUA, TSi⁵E⁵PUA, TSi⁷E³PUA, and TSi⁹E¹PUA) used for polyvinyl chloride (PVC) leather finishing agents have been prepared and characterized by nuclear magnetic resonance (NMR), Fourier transform infrared (FTIR), and gel permeation chromatography (GPC). All five multifunctional prepolymers exhibited excellent photopolymerization efficiency and good yellowing resistance. And the content of polysiloxane in prepolymers obviously affected the viscosity, thermal stability, tensile strength, elongation at break, and surface hydrophobicity of the photopolymerization systems. The system with the prepolymer containing more polysiloxane segments presented a high viscosity, and UV-cured film had relatively good thermal stability, elongation at break, and surface hydrophobicity accordingly. The properties of the prepolymers well satisfied the application requirements for leather finishing agents. Furthermore, surface microstructures of UV-cured films were characterized by scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS). More importantly, the PVC leather finishing agents designed based on the multifunctional polysiloxane–polyether block polyurethane acrylates possessed excellent comprehensive performances