![]() To improve the toughness of PMMA, many researchers have modified PMMA by copolymerization with suitable monomers and blending with second-phase particles. 2 Therefore, the research on the improving of its toughness is of great significance. 1 Nevertheless, PMMA is a hard and brittle plastic material with low mechanical strength, and its inherent brittleness means that it fails to meet the high requirements of certain applications as an engineering plastic. By virtue of its hardness, low weight and color versatility, PMMA can be used in a wide range of applications, such as in optical materials, sensors, the automobile field, solar cells, electronics, display units, biomedical devices, pneumatic actuation, and other fields. Introduction Poly(methyl methacrylate) (PMMA) is a thermoplastic polymer with good optical properties, transparency, and chemical resistance, and it can be used as an alternative to inorganic glass. This research provides a facile and practical method to overcome the shortcomings of ASA and promote its application in a wider range of fields. Specifically, the PMMA/ASA-2 composite exhibits a good balance between toughness and rigidity, indicating that ASA-2 with 5 wt% KH570 is the most suitable impact modifier. However, this is accompanied by loss of rigidity. The mechanical properties of the PMMA/ASA alloys strongly depend on the Si content, and the impact strength and elongation at break greatly improve when silicone-modified ASA is added. Silicone plays dual roles as a compatibilizer and a chain extender, and it not only improves interfacial adhesion between the PBA particles and SAN copolymer, but it also increases chain entanglement of poly(acrylonitrile-styrene-acrylate) (ASA). Here, core/shell organic–inorganic hybrid polymer nanoparticles (Si-ASA HPNs) with a silicone-modified butyl acrylate copolymer (PBA) core and a styrene-acrylonitrile copolymer (SAN) shell were used to toughen PMMA. Core–shell composite particles composed of a rubbery core and a glassy shell have recently attracted interest as a toughening agent for brittle polymers. Brittle failure can often be avoided by incorporating a small fraction of filler particles. On account of the utility of poly(methyl methacrylate) (PMMA) as a glass substitute, toughening of PMMA has attracted significant attention.
0 Comments
Leave a Reply. |