聚醚砜添加劑，可提高環氧復合材料的斷裂韌性
名為SumikaExcel 5003P的聚醚砜（PES）微粉添加劑已被證明是在寬溫度范圍內提高纖維增強環氧復合材料的斷裂韌性和抗微裂紋性能的理想選擇，而不會對尺寸穩定性，火焰/煙霧/毒性產生負面影響（FST） ），抗蠕變性，模量，沖擊或屈服強度。
該功能性添加劑廣泛用于航空航天工業中的預浸料和樹脂傳遞模塑碳纖維增強環氧樹脂，在汽車用環氧復合材料中得到應用，也可用于高性能運動用品。該材料由住友化學（東京）生產，由住友化學先進技術公司在北美銷售，該公司將次參加復合材料與先進材料博覽會（CAMX）。一般來說，PES是一種琥珀色透明的無定形工程熱塑性塑料，以其高溫性能，高強度和抗沖擊性，在高溫和高負荷下具有優異的抗蠕變性，非常好的尺寸穩定性，低線性熱膨脹系數（CLTE）而聞名。在很寬的溫度范圍內，固有的阻燃性，低煙，小的脫氣，良好和廣泛的耐化學性，以及耐熱水（180°C）。它提供用于注塑，擠出和薄膜工藝的顆粒狀，以及用于流延薄膜，過濾膜的粉末形式，以及用作復合材料，高溫涂料和涂料以及粘合劑的環氧添加劑。PES牌號用于航空航天，汽車，電氣/電子，醫療設備和食品處理行業。
在其作為環氧復合材料的功能添加劑的作用中，使用具有羥基（-OH）端基的特定等級。端基與環氧基質上的縮水甘油基反應形成交聯的互穿聚合物網絡（IPN）。盡管添加劑通常以2-12重量％的低調漆比使用，但它增加了IPN的更大柔韌性，這又提高了環氧復合材料的韌性。SumikaExcel 5003P的玻璃化轉變溫度（Tg）為230°C，高于典型的航空級環氧樹脂（120-200°C），并且具有良好的剛度和強度，因此抗沖擊性和抗裂性，不會影響其他熱機械性能。對航空航天應用尤其重要，它可以在不影響FST或模塑和保持非常嚴格的公差的情況下完成所有這些工作。雖然它常用于高性能碳纖維增強環氧復合材料，但它在玻璃或玄武巖增強環氧復合材料中同樣有效。
原文如下：
原文如下：
A polyethersulfone (PES) micro-powder additive called SumikaExcel 5003P, has proven ideal for boosting fracture toughness and resistance to micro-cracking for fiber-reinforced epoxy composites over a broad temperature range without negatively impacting dimensional stability, flame/smoke/toxicity (FST), creep resistance, modulus, impact, or yield strength.
The functional additive is widely used by the aerospace industry for prepreg and resin-transfer molded carbon fiber-reinforced epoxy, is gaining ground in epoxy composites for automotive, and could be used for high-performance sporting goods as well. The material is produced by Sumitomo Chemical (Tokyo) and is sold in North America by Sumitomo Chemical Advanced Technologies, which will exhibit for the first time at the Composites & Advanced Materials Expo (CAMX).
Generally speaking, PES is an amber-transparent, amorphous engineering thermoplastic known for its high temperature capabilities, high strength and impact resistance, excellent creep resistance at elevated temperatures and loads, very-good dimensional stability, low coefficient of linear thermal expansion (CLTE) over a broad temperature range, inherent flame retardance, low smoke, minimal outgasing, good and broad chemical resistance, and resistance to hot water (to 180°C). It is offered pelletized for injection molding, extrusion, and film processes and in powder form for cast films, filtration membranes, and as an epoxy additive for composites, high-temperature paints and coatings, and adhesives. PES grades are used in the aerospace, automotive, electrical/electronics, medical-device, and food-handling industries.
In its role as a functional additive for epoxy composites, specific grades with hydroxyl (-OH) end groups are used. The end groups react with glycidyl groups on the epoxy matrix to form a cross-linked, interpenetrating polymer network (IPN). Even though the additive is typically used at low letdown ratios of 2-12 wt-%, it adds greater flexibility to the IPN, which in turn boosts the toughness of the epoxy composite. SumikaExcel 5003P has a glass-transition temperature (Tg) of 230°C, which is higher than that typical of aerospace-grade epoxy resins (ranging from 120-200°C), and since it also has good stiffness and strength, it improves impact and crack resistance without compromising other thermo-mechanical properties. Especially important for aerospace applications, it does all this without affecting FST or the ability to mold and hold very-tight tolerances. Although it is most commonly used with high-performance carbon fiber-reinforced epoxy composites, it is equally effective in glass- or basalt-reinforced epoxy composites too.
