1、Preparation of multi

The toughening method established in this study provides an innovative solution for optimization of the impact resistance of engineering plastics, which has important reference value.

2、Improving impact strength and fracture toughness of epoxy resin through

This study addresses this limitation by introducing an innovative modification through the integration of epoxy-oligoester (EOS), derived as a byproduct of unsaturated polyester resin synthesis.

3、A systematic study on the synergistic effects of MWCNTs and

Here, core–shell impact modifier particles (CSIMPs) and multiwalled carbon nanotubes (MWCNs) were used as reinforcing agents for improving the toughness and tensile properties of epoxy resin.

Impact modifiers: (5) Modifiers for unsaturated polyester

The toughening effectiveness of impact modifiers of any kind in un saturated polyester and vinyl ester resins will depend on the rate of impact or applied strain, atmospheric conditions (temperature, presence of solvents), and the toughness of the base resin.

Toughening of unsaturated polyester resin by solid elastomers and

The fracture toughness and impact resistance of rigid unsaturated polyester can be improved by the incorporation of elastomers by physical and chemical methods.

Modification of Unsaturated Polyester Resin : A Review

Unsaturated Polyester Resin has endured modification to become nano-composites, composites, interpenetrating polymer networks (IPNs), blends and more. Unsaturated polyester resins are blended with a variety of materials to enhance their fracture and impact resistance.

Impact Modifier for Unsaturated Polyester Resin: Preparation and

Core-shell latex particles enhance the impact performance of unsaturated polyester resin (UPR). Optimal shell composition with 50% MMA significantly improves UPR impact toughness from 35 to 51.4 J/m. Preparation of core-shell particles involves a controlled two-stage emulsion polymerization process.

Unsaturated Polyester Resin Modifiers

Unsaturated polyester resin modifiers significantly enhance the comprehensive performance of UPR through diverse modification approaches. By selecting appropriate modifier combinations, resin properties can be tailored to specific application needs.

Optimizing rheological performance of unsaturated polyester resin with

Bio-based reactive diluents (RD) have been explored as alternative to styrene (STY) in unsaturated polyester resin (UPR). Among the different candidates, acrylated epoxidized soybean oil (AESO) and epoxidized linseed oil (ELO) stand out as triglyceride derivatives.

Unsaturated polyester resin modified with poly

However, some applications are limited to their low-impact resistance, which can be enhanced by the incorporation of modifiers that increase the flexibility of the network.

In modern industrial production, the performance of materials directly affects product quality and manufacturing efficiency. Particularly in fields such as automotive, aerospace, and electronics, stringent requirements are imposed on the mechanical properties of materials, with impact resistance being one of the critical indicators for evaluating comprehensive material performance. As an essential matrix for composite materials, unsaturated resins' modifiers and their formulations significantly influence their properties. This study aims to investigate the impact resistance performance of unsaturated resin modifiers and analyze the influencing factors.

I. Overview of Unsaturated Resin Modifiers

Unsaturated resin is a thermosetting plastic with excellent chemical stability and mechanical strength, widely used in aerospace, automotive manufacturing, construction, and other fields. its inherent brittleness and fragility make it prone to fracture under impact or pressure. improving the impact resistance of unsaturated resins has become an urgent problem to address.

II. Mechanism of Modifier Action

Modifiers enhance the impact resistance and toughness of unsaturated resins by altering their microstructure and chemical properties. Common modifiers include fillers, fiber reinforcements, and nanoparticles. These additives fill voids within the resin, increase intermolecular forces, and thereby improve overall strength and hardness. Additionally, modifiers can optimize resin flow and processing performance, making them suitable for complex molding processes.

III. Factors Affecting Impact Resistance

1. Types and Content of Fillers

   Fillers such as glass fibers and carbon fibers form three-dimensional network structures within unsaturated resins, effectively dispersing stress concentration points and enhancing load-bearing capacity. excessive filler content may reduce resin fluidity, compromise molding accuracy, and introduce internal defects. Thus, selecting appropriate filler types and controlling their content are crucial.

2. Role of Fiber Reinforcements

   Fiber reinforcements like carbon fibers and boron fibers significantly improve impact resistance and wear resistance. These fibers align directionally within the resin, enhancing tensile and flexural strength. Nonetheless, their incorporation may slow curing rates, requiring strict control of curing conditions.

3. Application of Nanoparticles

   Nanoparticles such as silica (SiO₂) and nitrogen boride (BN) leverage their unique physicochemical properties to substantially improve impact resistance. Uniformly distributed nanoparticles form stable interfacial layers, enhancing fatigue life and wear resistance. their use increases costs and processing complexity.

IV. Conclusions and Prospects

unsaturated resin modifiers—including fillers, fiber reinforcements, and nanoparticles—notably enhance impact resistance. each modifier has specific applications and limitations. Optimal combinations of modifiers and refined process parameters are key to achieving high-performance materials. In the future, advancements in novel materials technologies are expected to develop more efficient and environmentally friendly modifiers, opening new possibilities for enhancing unsaturated resin performance.