Preparation And Properties Of N-phenyl Maleimide/styrene Shape Memory Polymers

Smart polymer materials is currently one of the hot areas of research materials, countries all around the world has actively participated in research and development of this new functional materials. This paper studies the synthesis of N-phenyl maleimide/styrene shape memory polymer, which is one of intelligent materials for space application, and it has a good shape memory performance.In this paper, raising the temperature curing at different stages to prepare three series of N-phenyl maleimide/styrene shape memory polymer. Using Differential scanning calorimetry (DSC) to study the synthesis of the curing process and discusses the curing mechanism, and the content of crosslinker have an effect on thermal stability properties. molecular structure, mechanical property, and thermal mechanical properties have been characterized and discussed by means of Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), Scanning electron microscopy (SEM), Dynamic thermal mechanical analysis (DMTA). Meanwhile, we have studied the ratio of monomers and crosslinking agent make an impact on the structure and properties of SMP, and the monomer ratio on the shape memory polymer, as well as temperature of deformation and shape memory properties.The experimental results show that monomer ratio have effect on the curing process to a certain extent, When the content of N-PMI is 10 wt.%, the peak temperature and final temperature of the copolymerization system is the highest. crosslinker have effect on the thermal decomposition temperature and changes in weight loss is very small, very small changes in thermal stability; Increasing content of divinylbenzene, the bending strength and impact strength have changed significantly, When the content of divinylbenzene is 3 wt.%, The impact strength of SMP is up to 2.1 KJ/m2;The impact cross-section SEM images indicate that the copolymer has the trend of the ductile fracture transition; Increasing the content of N-PMI can improve the hardness of N-PMI copolymer system; With the increase of N-PMI content, the storage modulus decreased, while the loss factor increased, glass transition temperature increases with the content of divinylbenzene; Below and above the glass transition temperature, the change takes place in storge modulus of shape memory polymer and it shows the shape memory effect with a recovery ratio of nearly reach 100%.