Polymer composites offer high strength-to-weight ratios and other benefits such as corrosion-resistance, making them attractive in varied market applications, e.g., aerospace, automotive, and infrastructure. Fabrication processes include compression molding, infusion, filament winding, and pultrusion. Best suited for near-continuous production of parts with a fixed cross-section, pultrusion also allows for high fiber content and very high strengths along the fiber axis. This blog entry focuses on pultrusion using thermoset resins, although thermoplastic resins can also be [...]
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So far dianhydrides has created 12 blog entries.
Epoxy composites are a type of polymer material that uses an epoxy resin to create a polymer matrix which is reinforced with fibers or other fillers. This allows for the fabrication of long-lasting parts with very high strength-to-weight ratios. The low densities of epoxy composites compared to metals also offers substantial fuel savings in aerospace and automotive applications. Compared to traditional materials of construction—metal, concrete, wood, etc.—epoxy-based polymer composites are more resistant to deterioration from [...]
Increasing demand and supply chain challenges are causing shortages of epoxy resins. Demand is being driven by large sectors of the global economy opening after COVID-19 shutdowns. Prices are escalating and ongoing disruptions are taking their toll on downstream manufacturers. The issues do not look like they will be totally resolved within the next few months. For high-Tg products such as composites, adhesives, coating powders and the like, dianhydrides such as BTDA may offer a [...]
As a critical raw material in cutting-edge polyimide synthesis, the fluorinated dianhydride 6FDA* plays a small but important role in the military aerospace industry. While current supply chains link 6FDA to traditional and emerging Asian producers, there is also understandable pressure to ensure that U.S. military procurement options remain as domestic as possible. This has become increasingly important given the logistical challenges and product shortages of the current climate. The recent 6FDA product launch from [...]
Many products fall under the umbrella of adhesives but there are crucial differences among them. High-temperature (HT) adhesives are extremely durable and complex. They’re the go-to adhesives for service environments over 100℃, while quick-drying glues that you find on store shelves only operate from ambient temperature (20-30℃) to around 50℃. These heat-withstanding properties make high-temperature adhesives an ideal solution for technology, transportation, energy, and aerospace applications. Capable of performing under temperatures as high as 300℃, [...]
Modern technology demands specialized materials that function in extreme environments. Even as performance requirements increase, there is pressure to achieve results at the best possible price point. But balancing processing/property requirements such as curing temperature, curing cycle, heat resistance and toughness is no easy task. Specialized, multifunctional epoxy resins offer one path. But what if you can achieve the results you seek at a lower cost by using traditional DGEBA epoxy resins? With a history [...]
Pyromellitic Dianhydride (PMDA) is ideally-suited as a low-cost thermal curative for epoxy resins and as a co-monomer for polyimide synthesis. It was originally synthesized by a handful of Japanese and Western manufacturers including Daicel, DuPont, Du-Pont Toray, Jayhawk, Lonza, and Mitsubishi Gas Chemical. However, Pyromellitic Dianhydride has undergone a major shift in the manufacturing base and market dynamics over the past 5 years. China is now the major player, but volatility in raw material prices [...]
BTDA (3,3’, 4,4’-Benzophenone tetracarboxylic dianhydride) is a dianhydride that has been produced since the early 1970s. It has grown into a flagship product with a proven performance edge in the fields of epoxy and polyimide chemistry. BTDA is a thermal curative that can improve temperature stability, dimensional stability, and dielectric properties of epoxy resins, particularly those based on DGEBA (Diglycidyl ether of Bisphenol A). It can improve glass transmission temperatures (Tg) and impart superior chemical, [...]
Crosslinking refers to the interconnecting or bridging of two chemical compounds, and a crosslinker is the molecule that is used to make this interconnection. Crosslinkers can be used for all types of polymeric materials, with the identification of the crosslinker being dependent on the application requirements. Polymer crosslinking is accomplished via a wide variety of chemical reactions under an equally wide array of conditions. Catalysts can also be used in this process to accelerate the [...]
A syntactic foam is a composite material that is made by filling a polymer, ceramic, or metal with pre-formed hollow glass or ceramic spheres called micro balloons. The term ‘syntactic’ refers to the ordered arrangement of the spheres, and the term ‘foam’ refers to the closed cellular structure. Syntactic Foam Properties The hollow spheres within syntactic foam provide most of the materials beneficial properties. They have high specific strength, a low coefficient of thermal expansion, [...]