Epoxy resin composites prepared using hyperbranched polyamidates as toughening agents

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Product Overview: HyPer HPN202 is a high-molecular-weight, highly active hydroxyl-terminated hyperbranched polymer based on an aromatic polyamide hyperbranched polymer backbone; the hydroxyl groups can be modified to yield functional polymers with various properties. Performance characteristics: enhanced toughness, water solubility, high rheology, polyamide polyester structure. Typical values for HyPer HPN202 are a molecular weight of around 2700 g/mol; each mole of resin contains 12 moles of hydroxyl groups. The acid value is less than 80 mg KOH/g, while the hydroxyl value is approximately 250 mg KOH/g. The melting point ranges from 100 to 120°C. A typical application of HyPer HPN 202 is as a rheology aid for polyamide polymers such as nylon; in particular, in the field of fiber spinning, it enables a significant reduction in the diameter of materials like PP and nylon, thereby improving spinning efficiency and quality ； It can also be used as a reinforcing and toughening agent or curing agent for thermosetting resins such as epoxy resins, acrylic resins, polyurethane resins, phenolic resins, and cycloaliphatic resins ； It can be used as an intermediate for synthesizing other functional polymer materials ； It serves as a processing aid for thermoplastic materials such as PP, PE, PS, POM, etc., to improve their rheological properties. Epoxy resin composites were prepared using hyperbranched polyamidates as toughening agents. Its mechanical and thermal properties were tested, and the impact fracture surfaces were observed and compared using a scanning electron microscope. The results show that the addition of hyperbranched polyamide esters increased the impact strength of the epoxy resin from 12.27 kJ/m2 to 29.78 kJ/m2, without any decrease in its tensile and flexural strengths. Both the bending test and the impact fracture surface showed significant stress whitening, further verifying the role of the cavitation theory of hyperbranched polymers in enhancing the toughness of polymers. Meanwhile, the scanning electron microscope images show that the composite material has a honeycomb structure, with numerous tears, and the stress fringes tend to be dispersed. The heat resistance of composite materials remains largely unchanged.