Lotion Interpenetrating Polymer Network (LIPN) Method
Jul 3, 2023
Lotion interpenetrating polymer network (LIPN) is an interwoven network structure formed by physical or Chemical bond of two or more polymers, of which at least one polymer is reticulated and the rest can be linear. The synthesis of LIPN is usually carried out by multi-step seed lotion polymerization. First, the cross-linked polymer lotion as the seed is synthesized, and then another monomer (or mixed monomer), cross-linking agent and initiator are added into the seed lotion to initiate reaction without adding new emulsifier, so that another monomer or mixed monomer can polymerize and cross link on the surface of the seed latex particles, thus generating LIPN. Therefore, LIPN generally has a core-shell structure.
The phase separation structure of this material in the space of tens to hundreds of nanometers is the foundation of its excellent performance. The molecular chains of interpenetrating polymer networks are cross-linked, interpenetrating and intertwined respectively, and there are forced compatibility, interpenetrating interface and synergistic effects, which enhance the stability of lotion, improve the wear resistance, water resistance, weather resistance, pollution resistance, radiation resistance and physical and mechanical properties of polymers, and can be used as surface coatings, stain resistance agents, sealing Adhesive, drug release materials, stone engraving weathering materials, etc.
A polydimethylsiloxane-polymethylacrylic acid interpenetrating network was prepared using monomer impregnation method, air interpenetrating network interface method, and glass interpenetrating network interface method, and its structure and properties were characterized. The results indicate that the interface during the preparation of interpenetrating networks has a significant impact on the polymer morphology. The telechelic polydimethylsiloxane (PDMS) with different end groups (such as methacryloyloxy, o-phenylene benzene, acrylamide or Methacrylamide) was dissolved in acrylate monomer, and a series of IPNs of silicone acrylic copolymer were polymerized by UV initiation. The results indicate that different amounts, compositions, and relative molecular weights of monomers can result in different states of final products, such as mortar colored brittle plastics, semi transparent elastic plastics, or completely transparent elastomers, and the performance of the products also shows different changes.
Organic silicon monomers and acrylic ester monomers can be prepared into interpenetrating polymer network structures under certain conditions. First, cross linked polydimethylsiloxane lotion is prepared, then Butyl acrylate and crosslinking agent are added to the above lotion for swelling and polymerization to obtain core shell lotion polymer. Finally, the residual acrylate monomer, initiator and emulsifier are added to the core lotion for polymerization by continuous dropping method. In the preparation stage of nuclear lotion, the monomer first dissolves into the polysiloxane lotion particles and polymerizes, forming an interpenetrating polymer network in the lotion particles.
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