Application and current status of liquid crystal LCP gold-plated copper film in biomedical in-situ composite optical devices and thermal conductivity fields

Application and Current Status of Liquid Crystal LCP in Biomedical Field

Biomedical materials are widely used in the field of replacing and repairing biological tissues/organs, requiring characteristics such as non toxicity, corrosion resistance, high long-term retention of mechanical properties, easy processing into various shapes, and strong biocompatibility. LCP meets these characteristics and has excellent properties such as high strength, high modulus, easy processing, and self reinforcement. In addition, studies have shown that many biological tissues have a liquid crystal ordered structure, and the LCP structure coincides with the biological collagen fibers at the molecular level.

Lee et al. used LCP as a carrier to investigate the feasibility of antigen detection instruments. Ha et al. used LCP as a carrier to prepare a microsensor that can effectively monitor intraocular pressure in mice. Gwon et al. reviewed the current status and prospects of LCP in the field of neural repair materials. Jeong et al. prepared a retinal repair device using LCP material, which can maintain insulation for 400 days in phosphate buffered saline. Lee et al. developed a neural probe sensor using LCP, which can effectively penetrate deep into animal brain nerves without the need for an import tool; Ko ç er et al. prepared a network using LCP to simulate the extracellular environment and study the migration characteristics of cells.

Application and Current Status of Liquid Crystal LCP in the Field of In Situ Composite Materials

Inorganic fiber reinforced polymer matrix has problems such as high melt viscosity, high processing energy consumption, and large equipment wear. At the same time, the poor compatibility between inorganic fibers and polymer matrix greatly reduces the impact resistance of the material. LCP in-situ composite materials were proposed in the mid-1980s, LCP、 After the melt blending of thermoplastic polymers, during the extrusion/injection molding process, LCP is oriented to form fiber structures with diameters ranging from submicron to nanometer under the induction of heat flow and stress. After cooling, LCP fiber in-situ reinforced composite materials are formed at the molecular level, which have excellent processing properties such as low melt viscosity and low energy consumption, and can effectively improve the problems of inorganic fiber reinforcement.

Qinling and other studies have shown that LCP can be uniformly dispersed in PET in a fibrous form; Jiang et al. significantly increased the flexibility and strength of the composite material by self reinforcing PP with LCP. Mubashir et al. used LCP reinforced PPS to prepare fibers with higher tensile modulus than reported continuous fibers.

Application of Liquid Crystal LCP in Other Fields

LCP has also been extensively applied in fields such as optical devices, thermal conductivity, and shape memory. Yu Yingmin reviewed the synthesis methods of phenanthrene based liquid crystal polymers and their applications in optoelectronic materials. Ji Fance et al. prepared liquid crystal polymers with different degrees of crosslinking and studied the effects of rigid crosslinking agents and flexible crosslinking agents on the shape memory properties of liquid crystal polymers. Sun et al. studied the effect of LCP on the flexural strength of cement, and the results showed that 0.1% (mass fraction) of LCP can increase the flexural strength of cement from 5.5 MPa to 28.1 MPa.

Chen et al. studied the effect of liquid crystal cells on the thermal conductivity of epoxy, and the results showed that after introducing liquid crystal into epoxy, the thermal conductivity of the material (0.292W/(mK)) was 1.5 times that of traditional epoxy. Liu Chunbo et al. simulated the viscosity coefficient of LCP using Maier Saupe theory and Doi Edwards theory, and the results showed that the simulated values of Maier Saupe theory were closer to the actual values.