1、Novel sustainable synthesis of a formaldehyde

In that frame, terephthalaldehyde (TPA), a non-toxic aromatic dialdehyde, has been selected to replace formaldehyde while resorcinol has been chosen as a replacement of phenol. The syntheses were performed without solvent at temperatures between 150 and 170 °C with a reaction time of around 3 minutes.

2、Sustainable Replacement of Phenol for Synthesis of Phenol

To conclude, this study presents a novel approach to develop a lignin-based phenolic resin using sugar byproduct as a feasible substitute for phenols, addressing the limitations associated with their production. These findings offer promising prospects for sustainable production practices in polymer chemistry.

3、Engineering an All

In this work, we disclose the preparation and fabrication of an all-biobased curable resin. The devised resin consists of a polyester component based on fumaric acid, itaconic acid, 2,5-furandicarboxylic acid, 1,4-butanediol, and reactive diluents acting as both solvents and viscosity enhancers.

4、In

In this work we provided a strategy for the synthesis of ferrocenecarboxaldehyde (Fc) in-situ modified TPA-phenol resin (PTPA-Fc), obtaining resin products with high glass transition temperatures at 302 °C.

5、Novel sustainable synthesis of a formaldehyde

In that frame, terephthalaldehyde (TPA), a non-toxic aromatic dialdehyde, has been selected to replace formaldehyde while resorcinol has been chosen as a replacement of phenol. The syntheses were performed without solvent at temperatures between 150 and 170 °C with a reaction time of around 3 minutes.

A solvent

This study develops and provides a solvent-free and one-pot method to prepare biobased epoxy acrylic resins, which are suitable to use as photoresist resin. The use of biomass raw materials and green UV-curing technology follows the principles of green chemistry.

Styrene

In summary, here described styrene- and cobalt-free system has a great potential to reduce health and ecological issues of currently used unsaturated polyester resins including those curable at room temperature.

Formaldehyde

Today, phenolic resins are polymers still widely used, with a global production of about 12 million tons/per year. However, their syntheses need the use of formaldehyde and phenol, which are highly toxic. Notably, formaldehyde is carcinogenic.

Resin

The synthesis steps in the preparation of chelating resins are usually more complicated than those of physically impregnated resins, which can be considered as one of the disadvantages of these modified resin types.

Novel sustainable synthesis of a formaldehyde

New non-toxic monomers derived from natural resources are used to prepare bio-based phenolic resins by the environmentally friendly reactive extrusion method. These resins present a very high thermal stability.

In modern industry, free resin, as a critical high-molecular-weight material, relies on modification technologies to enhance its performance and expand its application range. The modification of free resin is primarily achieved through physical and chemical methods, which significantly improve its mechanical properties, thermal stability, electrical insulation, and other key characteristics. This article explores the main approaches to free resin modification, analyzes the effects of different methods, and discusses their applications.

I. Physical Modification

1. Filler Modification

• Inorganic Fillers: Materials such as quartz powder and talcum powder effectively increase the hardness and wear resistance of resins. For example, adding 5% silicate fillers can substantially enhance the tensile strength of epoxy resin.
• Organic Fillers: Materials like carbon fibers and glass fibers improve mechanical strength and heat resistance. For instance, incorporating 20% carbon fibers can significantly boost the tensile strength and heat deflection temperature of polyimide resin.

2. Fiber Reinforcement

• Carbon Fibers: Favored for high specific strength and modulus in high-performance composites.
• Glass Fibers: Commonly used in laminates to provide excellent mechanical properties and thermal stability.
• Aramid Fibers: Offer exceptional heat resistance, making them suitable for aerospace applications.

3. Surface Treatment

• Coupling Agents: Silane coupling agents, for example, enhance adhesion between resin and fillers when applied to glass fibers.
• Surface Roughening: Techniques like sandpaper polishing or sandblasting increase surface roughness to promote uniform filler distribution and bonding.

II. Chemical Modification

1. Graft Copolymerization

• Free Radical Polymerization: Initiators trigger free radical reactions on resin chains, introducing new monomers to alter molecular structures.
• Ionic Polymerization: Ion exchange reactions incorporate functional monomers, enabling targeted property adjustments.

2. Crosslinking

• Chemical Crosslinking: Agents like peroxides or anhydrides form chemical bonds between resin molecules, improving mechanical and thermal properties.
• Radiation Crosslinking: Electron beams or gamma rays induce chain scission and recombination, creating three-dimensional network structures.

3. Graft Copolymerization

• Functionalization: Chemically grafting monomers onto macromolecules imparts new properties, such as conductivity or optical characteristics.

III. Comprehensive Modification

1. Hybrid Modification

• Physical-Chemical Combination: Integrating physical filling with chemical graft copolymerization yields superior composite properties.
• Multilayer Composites: Sequential physical or chemical modifications layer by layer progressively enhance resin performance.

2. Nanotechnology

• Nanoparticle Dispersion: Uniform dispersion of carbon nanotubes, graphene, etc., in resin matrices improves strength, thermal conductivity, and electrical conductivity.
• Nanofiber Networks: Woven nanofiber structures significantly elevate mechanical and thermal stability.

3. Bio-Based Modification

• Biomass-Derived Resins: Produced from agricultural waste (e.g., corn starch, sugarcane residue), these resins are eco-friendly and cost-effective.
• Biodegradable Resins: Adding biodegradable agents (e.g., polylactic acid) enables faster decomposition in natural environments, reducing pollution.

IV. Application Areas

1. Electronics and Electrical Engineering

• Circuit Board Substrates: Modified resins enhance electrical performance and heat resistance.
• Encapsulation Materials: Used in semiconductor packaging for improved device stability.
• Fiber Optic Coatings: High-performance coatings extend optical fiber transmission lifespan.

2. Automotive Industry

• Lightweight Materials: High-strength, low-density resins reduce vehicle weight and improve fuel efficiency.
• Wear-Resistant Materials: Surface treatments boost automotive component durability.
• Soundproofing Materials: Resin-based composites absorb noise in automotive systems.

3. Aerospace

• High-Temperature Resistant Materials: Resins for aerospace engine and structural components withstand extreme temperatures.
• Lightweight Composites: Used in aircraft fuselages and wings for reduced weight.
• Thermal Protection Systems: Resin composites shield spacecraft from heat exposure.

4. Medical Devices

• Biocompatible Materials: Resins safe for medical implants and instruments.
• Drug Delivery Systems: Modified resins act as carriers for controlled drug release.

The modification of free resin is a multifaceted process integrating physical, chemical, and biological approaches. Scientifically tailored modifications enable significant performance upgrades, meeting stringent application demands. In the future, advancements in material science will drive innovation in resin modification, delivering more efficient and environmentally friendly solutions across industries.