Mechanical and thermal properties of synergistic modification of bismaleimide polymer composites with nano‐SiO₂ and hyperbranched polyimide

Abstract

Bismaleimide resin (BMI) is a thermosetting resin with excellent properties. However, due to its poor toughness as a cured product, this paper uses hyperbranched polyimide (HBPI) and nano‐SiO2 in a synergistic manner to improve the performance of BMI. Isophorone diisocyanated tripolymer (IPDI trimer) and methyl nadic anhydride (MNA) were used to synthesize HBPI, and then we investigated the effect of the synergistic modification on the mechanical and thermal properties and the modification mechanism of HBPI and nano‐SiO2. The experiments showed that the most significant improvements were achieved at the addition of 40 and 3 wt% of HBPI and nano‐SiO2 respectively, with the impact strength of the materials increasing by 97.2%, fracture toughness indexes GIC and KIC increased by 36.7% and 34.6% respectively and glass transition temperature (Tg) was reduced. The SEM results showed that the nanoparticles were uniformly dispersed and further validated the synergistic modification mechanism.

Hydroxyapatite/hyperbranched polyitaconic acid/chitosan composite scaffold for bone tissue engineering

“…[6][7][8][9] Amongst those materials, hyperbranched polymers are considered an important class of active materials whose unique properties as high number of active groups and globular structure with several potential applications. [10][11][12] Several hyperbranched polymers with bioactive properties were studied as tissue engineering scaffolds such as polylactic acid (PLA), hyper-brancher polyglycerol (HPG), polycaprolactone (PCL), polurethane (PU) and poly ethylene glycol (PEG), and polylactic glycolic acid (PLGA). [12][13][14][15][16][17][18] On the other hand, chitosan (CS) is an important natural biopolymer as it is biocompatible, biodegradable and can be shaped into different structures including porous structure in addition to its osteoconduction and intrinsic antibacterial nature.…”

“…Biocompatible polymers may include both natural and synthetic materials which can effectively act with other materials whether organic or inorganic making potential composites 6–9 . Amongst those materials, hyperbranched polymers are considered an important class of active materials whose unique properties as high number of active groups and globular structure with several potential applications 10–12 . Several hyperbranched polymers with bioactive properties were studied as tissue engineering scaffolds such as polylactic acid (PLA), hyper‐brancher polyglycerol (HPG), polycaprolactone (PCL), polurethane (PU) and poly ethylene glycol (PEG), and polylactic glycolic acid (PLGA) 12–18 .…”

Synchronously improved toughness and dielectric properties of cyanate ester resins via modification with biobased poly(N‐phenylmaleimide‐co‐limonene)

“…Nevertheless, they show poor dielectric properties, weak impact strength or low temperature resistance, which extremely limit their practical application. [5][6][7] To this end, it is highly desired to develop highperformance materials with low dielectric constant (ε), low dielectric loss (tanδ), high thermal conductivity and insulation.…”

“…Hence, the CE resin has been widely used in the fields of aerospace, high-performance printed circuit board (PCB), adhesive materials, high frequency radome, microwave communications, and so on. 7,[9][10][11][12] However, the extremely high curing temperature and long curing time severely impede their practical application. 13 Even worse, the extremely high crosslinking degree and highly rigid triazine ring structure will inevitably result in drastically increased brittleness, reduced impact strength and vigorous stress cracking, which severely affected the service life of CE resin.…”