Aluminum‐borate‐whiskers‐reinforced bismaleimide composites. 1: preparation and properties

Abstract

Aluminum‐borate‐whiskers‐reinforced bismaleimide (BMI/Al18B4O33) composites were prepared, and the mechanical and thermal properties were investigated. Results show that the coupling agent used for surface treatment of whiskers has a great effect on the properties of these materials. Composites containing surface‐untreated whiskers, or silane‐compound‐KH 921‐treated whiskers, exhibited initially only a slight increase in the flexural strength when the whiskers weight content increased up to 5 wt%; thereafter, they showed a sharp decrease when the whiskers content was higher than 5 wt%. On the other hand, impact strength tests showed that the addition of the two kinds of whiskers decreased the impact strength of the composites. However, studies of the composite containing borate (BE4)‐treated whiskers showed that its flexural strength greatly increased with increasing whisker content. Moreover, the composite showed initially an increase in impact strength with a whisker content up to 10 wt%, then showing a slight decrease when the whisker content reached 15 wt%. Scanning electron microscopy observations revealed that the two coupling agents (KH 921 and BE4) employed in this work tend to change the fracture features of the composites from brittleness to that of ductile behaviour. Copyright © 2004 Society of Chemical Industry

Novel high performance copper clad laminates based on bismaleimide/aluminium borate whisker hybrid matrix

“…The 4,4 0 -bismaleimidodiphenyl methane (BDM) (mp ¼ 156-1588C) was provided by the Northwestern Chemical Engineering Institute (China), o,o 0 -diallyl bisphenol A (DBA) was supplied by Northwestern Polytechnical University (China). Al 18 B 4 O 33 whiskers were obtained from Qihai Haixing Science and Technology Development (China), which was used as received, or surface treated by borate (designed as BE4, and its chemical structure is shown in Scheme 1) as described in previous literature, 22 the surface treated whiskers were coded as Al 18 B 4 O 33 (BE4) whiskers. The copper foil and the E-glass fiber cloth were supported by Ventec Copper Clad Laminates (China).…”

“…Al 18 B 4 O 33 whiskers were obtained from Qihai Haixing Science and Technology Development (China), which was used as received, or surface treated by borate (designed as BE4, and its chemical structure is shown in Scheme 1) as described in previous literature, 22 the surface treated whiskers were coded as Al 18 B 4 O 33 (BE4) whiskers. The copper foil and the E-glass fiber cloth were supported by Ventec Copper Clad Laminates (China).…”

Flame retardancy materials based on a novel fully end-capped hyperbranched polysiloxane and bismaleimide/diallylbisphenol A resin with simultaneously improved integrated performance

“…It is known that there is a Michael reaction between the maleimide and -NH 2 groups (ESI †), 26 and several diamine modified BMI resin systems have been developed for commercial applications. 27 Therefore, the -NH 2 group is designed to be introduced in the molecule of the new hyperbranched polysiloxane.…”

Preparation and properties of mesoporous silica/bismaleimide/diallylbisphenol composites with improved thermal stability, mechanical and dielectric properties

“…The concentrated product was cooled to 4°C, and then microcrystallites were precipitated from the cool solution. The crystal was separated by filtration, washed with acetone and dried in vacuum to afford cubic octameric silicate anion, (Me 4 N) 8 Si 8 O 20 , coded as D4R. 5-10 ml methanolic solution of D4R (2 g) was added dropwise to a mixture of dimethyldichlorosilane (2 ml), hexane (30 ml) and dimethylformamide (50 ml) with vigorous stirring in an ice bath.…”

“…In fact, developing high performance insulators based on BMI resin has been one of the hottest topics in recent years. Some kinds of inorganic fillers have been used to prepare BMI resin matrix composites [6][7][8][9], of them mesoporous silica has attracted considerable interests owing to its highly ordered and uniform mesoporosity [10] as well as extremely low dielectric constant (1.4-2.1) [11][12][13][14]. However, present mesoporous silica mainly consists of Si-O-Si like zeolite, showing brittleness and poor interaction with organic polymers, and thus can not significantly improve the integrated performance of original polymers.…”