聚醚砜添加剂，可提高环氧复合材料的断裂韧性
名为SumikaExcel 5003P的聚醚砜（PES）微粉添加剂已被证明是在宽温度范围内提高纤维增强环氧复合材料的断裂韧性和抗微裂纹性能的理想选择，而不会对尺寸稳定性，火焰/烟雾/毒性产生负面影响（FST） ），抗蠕变性，模量，冲击或屈服强度。
该功能性添加剂广泛用于航空航天工业中的预浸料和树脂传递模塑碳纤维增强环氧树脂，在汽车用环氧复合材料中得到应用，也可用于高性能运动用品。该材料由住友化学（东京）生产，由住友化学先进技术公司在北美销售，该公司将次参加复合材料与先进材料博览会（CAMX）。一般来说，PES是一种琥珀色透明的无定形工程热塑性塑料，以其高温性能，高强度和抗冲击性，在高温和高负荷下具有优异的抗蠕变性，非常好的尺寸稳定性，低线性热膨胀系数（CLTE）而闻名。在很宽的温度范围内，固有的阻燃性，低烟，小的脱气，良好和广泛的耐化学性，以及耐热水（180°C）。它提供用于注塑，挤出和薄膜工艺的颗粒状，以及用于流延薄膜，过滤膜的粉末形式，以及用作复合材料，高温涂料和涂料以及粘合剂的环氧添加剂。PES牌号用于航空航天，汽车，电气/电子，医疗设备和食品处理行业。
在其作为环氧复合材料的功能添加剂的作用中，使用具有羟基（-OH）端基的特定等级。端基与环氧基质上的缩水甘油基反应形成交联的互穿聚合物网络（IPN）。尽管添加剂通常以2-12重量％的低调漆比使用，但它增加了IPN的更大柔韧性，这又提高了环氧复合材料的韧性。SumikaExcel 5003P的玻璃化转变温度（Tg）为230°C，高于典型的航空级环氧树脂（120-200°C），并且具有良好的刚度和强度，因此抗冲击性和抗裂性，不会影响其他热机械性能。对航空航天应用尤其重要，它可以在不影响FST或模塑和保持非常严格的公差的情况下完成所有这些工作。虽然它常用于高性能碳纤维增强环氧复合材料，但它在玻璃或玄武岩增强环氧复合材料中同样有效。
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.
