Products Description
Introduction and application of Styrene Maleimide Copolymer|SMA-I|Styrene-maleic anhydride copolymer imidization product
Styrene-maleic anhydride copolymer (SMA) is a thermoplastic resin with high heat resistance and good compatibility. However, the maleic anhydride unit on the main chain of its molecule is easily hydrolyzed by heat, resulting in reduced mechanical strength. For this reason, people have proposed to imidize the maleic anhydride and introduce the maleimide unit into the main chain of its polymer molecule to obtain a styrene-maleimide copolymer (SMI) with better performance. So far, there are two ways to synthesize SMI: direct copolymerization of styrene and maleimide and imidization of SMA. The latter is more economical, efficient and flexible. However, since the imidization reaction of SMA is easily affected by the steric hindrance effect of the imidization reagent (various amines) and the steric hindrance effect of the SMA macromolecular chain itself, it is difficult to completely convert SMA into SMI. Therefore, its imidization product may contain three groups: maleic anhydride, maleamic acid and maleimide.
Specification of Styrene Maleimide Copolymer|SMA-I|Styrene-maleic anhydride copolymer imidization product
Achieving functional styrene–maleic anhydride (SMA) copolymer dispersant is highly attractive but still remains a challenge. Conventional modified SMA dispersants have complex modification steps, poor performance, and limited applications. Thus, a series of styrene–maleimide (SMI) copolymers with different functionality as amphiphilic dispersants for dispersing nano-SiO2 in an aqueous solution were synthesized using a simple preparation process. The changes in the maleic anhydride groups during imidization were tracked using FTIR spectroscopy, 1H-NMR, and GPC. A rotational viscometer and an inverted bottle method were used to measure the viscosity and coagulation time of the nano-SiO2 aqueous dispersion system, respectively, after adding the SMI dispersants. The particle size, size distribution, and dispersant adsorption amount of the dispersion were analyzed using laser particle size analysis; FTIR spectroscopy and SEM; and TGA, respectively. The results showed that the hydrogen bonds formed between the amino groups in the dispersant and the hydroxyl groups on the SiO2 surface during stirring allowed the dispersant to be adsorbed onto the SiO2 surface after being added to the nano-SiO2 aqueous system. The addition of the SMI dispersant enhanced the steric hindrance and electrostatic repulsion between the nanoparticles, thus making it possible for the SiO2 nanoparticles not to easily aggregate in water, improving their dispersity and stability. Additionally, the type and amount of SMI dispersant used significantly affected the SiO2 nanoparticles' ability to disperse in water. This makes SiO2 particles convenient to use and transport, not produce dust pollution, and easy to store.Graphical abstract
Package of Styrene Maleimide Copolymer|SMA-I|Styrene-maleic anhydride copolymer imidization product
Specifications: 1kg,10kg,100kg, 1000kg (can be packaged according to customer needs)
Function and use: This product is used for content determination and not for other purposes.
Storage method: 2-8°C, store in a cool and dry place, away from light.
Note: This product should be stored at low temperature. The content will decrease if exposed to air for a long time.
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