Chang-An Xu

• Doctor of Engineering
• PhD at Chinese Academy of Sciences

The poor dielectric properties of epoxy resins limit their application in microelectronics, and active ester curing agent is an effective means to enhance the dielectric properties of epoxy resins. However, the phenyl active ester curing resins nowadays have the problem of low mechanical properties. In this work, a novel naphthalene‐based active es...

At present, the dielectric constant of anticorrosion coatings is relatively high, which limits its application in electronic devices, and the epoxy curing agent currently used is mostly from fossil resources, which is not conducive to sustainable development. Therefore, a vanillin-based active ester curing agent (VAEI) containing an imine bond was...

Liquid silicone rubber (LSR) exhibits excellent thermal stability and has been selected for use in a variety of applications where thermal stability, chemical resistance and fire-retardant are required. The enhancement of the organic-to-inorganic conversion of LSR to improve their flame-retardant properties represents a significant area of research...

Polyurethane materials have received increasing attention as daily materials due to their unique structures and properties [...]

以大豆油为原料，通过简单的醇解反应制备了一种新型大豆油基丙烯酰胺单体（SO-HEAA），随后将其与丙烯酸异冰片酯（IBOA）复配，在 UV 下制备了多种不同性能的粘合剂。通过红外和核磁手段对结构进行表征，采用万能试验机、热重分析仪、流变仪和接触角测试仪对粘合剂的机械性能、耐热性、储存模量、损耗模量和接触角值进行了表征。结果表明：改变 IBOA 的含量可以有效调节粘合剂的性能；SO-HEAA 与 IBOA 的质量比为 1∶4 时，粘合剂 IBOA4 表现出较好的综合性能，断裂强度 1.42 MPa，断裂伸长率高达419.7%，表面达到了疏水效果；该粘合剂不仅对不同的基材可以形成较好的粘接效果，而且还具有较好的水下粘接性能；此外，所有粘合剂对频率具有依赖性，通过 IBOA 的调节实现了粘合剂在弹...

Because of its unique molecular structure and renewable properties, vegetable oil has gradually become the focus of researchers. In this work, castor oil was first transformed into a castor oil-based triacrylate structure (MACOG) using two steps of chemical modification, then it was prepared into castor oil-based waterborne polyurethane acrylate em...

Vinyl ester resins (VER) are commonly used in the field of anticorrosive coatings. During the preparation and application of the coatings, it is inevitable to produce defects such as micro-porosity, micro-cracks, and scratches, which will reduce the barrier capacity of the anticorrosive coatings against corrosive media. In this paper, 2(chloromethy...

Graphene oxide (GO) has abundant oxygen-containing functional groups, making it easy to undergo covalent and non-covalent modifications, coupled with its excellent physical barrier ability, which shows great prospects in improving the corrosion resistance of coatings. Unfortunately, GO has a strong van der Waals force and π-π interactions, which ma...

With the implementation of plastic restrictions and the increasingly serious problem of environmental pollution, paper with green and recyclable characteristics is gradually becoming a substitute for packaging materials. However, the rich cellulose structure in the paper, which contains hydroxyl groups leading to its hydrophilicity, allows water mo...

Although the coating can effectively prevent metal corrosion, it is easy to form micro-pores and micro-cracks during the curing process, and the coating is inevitably damaged by the external environment during use, resulting in a reduction in its protective ability, thereby shortening the service life of the substrate. Inspired by the stress closur...

为提升环氧(EP)树脂的阻燃性，首先采用三聚氰胺-甲醛预聚体(MF)原位功能化MXene纳米片制备了纳米 阻燃填料(MF@MXene)，随后将MF@MXene加入到EP 树脂中，以4，4'-二氨基二苯基甲烷为固化剂，进一步研制了MXene基阻燃环氧复合材料。使用傅里叶变换红外光谱、扫描电子显微镜和能谱分析等手段分别表征了MXene和MF@MXene的化学结构、微观形貌和元素含量。采用拉伸试验机和锥形量热测试仪分别测试了复合材料的力学性能和阻燃性能。结果表明，MF@MXene可以显著改善MXene在环氧树脂中的分散性并提升EP复合材料的力学性能和阻燃性能。当MF@MXene的添加质量分数为2.0%时，EP 复合材料的拉伸强度高达82.5 MPa，相比纯EP 提升了20.2%；其热释放率峰值、总...

Castor oil was used as raw material to prepare a new CODEA monomer by amidation reaction, and then it was combined with isophorone diisocyanate, hydroxyethyl methacrylate, 2, 2'-disulfide diethanol or bis (4-hydroxyphenyl) disulfide to synthesize a double-bonded prepolymer, and a self-healing film was prepared under UV conditions. The structure, th...

Traditional thermosetting materials cannot be degraded, recycled, or reprocessed once they attain their end-oflife causing environmental pollution. Using renewable feedstocks to develop covalent adaptive networks (CANs) based on dynamic covalent bonds can make up for the above shortcomings. The design of new polymeric materials using renewable feed...

Epoxy vinyl ester resin is widely used in the field of corrosion protection because of its excellent corrosion resistance and mechanical properties. However, due to the ease of hydrolysis of the ester group in the ester resin, the barrier ability of the coating is reduced, which will accelerate metal corrosion. The existing literature shows that th...

Carbon-based nanomaterials have mighty prospects in thermal conductive applications. In the past few decades, graphene and its derivatives have been shown to be very effective in heat dissipation capability and there are many reviews of these. Diamond, particular nanodiamond nanoparticles (ND NPs) with 5–10 nm, as another important carbon allotrope...

To explore high thermal properties, low dielectric constant and loss for copper clad laminates, poly(phenylene oxide) (PPE) with different end groups (allyl and epoxide groups) were successfully prepared. Firstly, low molecular weight polyphenylene ether was synthesized using the redistribution method. Then the polyphenylene ether thermosetting pol...

To explore thermal and mechanical properties of epoxy material, difunctional aromatic epoxy--divinylbenzene dioxide (DVBDO) had been synthesized by epoxidizing divinylbenzene, using the metal acetylacetone compound grafted Fe3O4 particles as the catalyst. The catalyet had high conversion and epoxy selectivity and could be recyclable. Then the polym...

At present, the energy crisis is becoming increasingly outstanding, and the expanding market of pressure sensitive adhesives (PSAs) puts forward higher requirements for biomass materials. Vanillin comes from biomass raw materials, and it has been widely used in related research fields. So far, there are few reports on the preparation of novel monom...

Biomaterials provide inspiration for the assembly of preparation molecules into complex structures. There is more catecholic amino acid dihydroxyphenylalanine in mussel's holdfasts, which is beneficial to enhance the interfacial adhesion to the marine surfaces. Although there are numerous scholars on mussel-mimicking polymers, there are still insuf...

The development of materials with efficient heat dissipation capabilities and remarkable mechanical properties is essential for high-power integrated electronic devices and flexible smart devices. Herein, a flexible cellulose nanofibers (CNF)/nanodiamond (ND)/MXene (CNM) composite film with typical nacre-like structure is fabricated using a facile...

Nano-cellulose is widely used in the fields of double-hydrophobic interface fabric, high-grade protective clothing, chemical industry and medicine. Although the research of nano-cellulose has received widespread attention, because of its strong intermolecular force, its dispersion in the medium is not ideal. In order to further increase the dispers...

Flexible elastomer material with high stretchability and self-healing performance is the preferred substrates for preparing multi-function flexible sensors and bionic electronic skin. However, it is still a great challenge to...

Design and exploitation of smart fire-warning devices with ultrasensitive response capability are always an urgent need for effective fire protection. Herein, a nano-filler (BP-MoS2) is prepared by ball milling black phosphorene and molybdenum disulfide and added into the graphene oxide (GO) film to fabricate a multifunctional film with high fire r...

This paper reports a fresh and robust strategy to develop polyurethane/polysiloxane pressure-sensitive adhesives (PSAs) with excellent properties by replacing part of C5 petroleum resin with modified lignin. A unique aspect of this work is the use of renewable lignin to obtain modified monomers. The phenolic hydroxyl group of lignin is increased by...

Benzene-1,3,5-triyl tribenzoate (TBB), both 3,5-bis(benzoyloxy)benzoate-terminated poly (aryl ether ketone) oligomers (BPAPK and TMPK), containing active ester (Ph−O−(C=O)− structure), were prepared and served as curing agents for dicyclopentadiene novoalc epoxy (DCPD). The curing kinetics and properties of three epoxy thermosets were systematicall...

Design and development of intelligent fire warning materials with rapid response capabilities has always been an urgent need for the safety of many flammable materials in their applications. Herein, an aminated black phosphorene (BP-NH2) prepared by ball milling was employed to connect with graphene oxide (GO) via covalent bonds to fabricate a flex...

Owing to the high interface thermal resistance and aggregation in polymer-based materials, the thermal conductivity of multi-walled carbon nanotubes (MWCNTs) has been severely decreased in practical applications. In this work, an amino-functionalized black phosphorene (BP–NH2) fabricated by ball milling has been employed to react with carboxylated...

A flexible cellulose nanofibers/[email protected] film with nacre-like structure is constructed by a facile vacuum-assisted filtration process. The composite film shows an outstanding thermal conductivity of 22.43 W m⁻¹ K⁻¹ at 30 wt% [email protected] loading, which enhances 769% relative to the pure CNFs film. This is mainly due to the bridging ef...

The conductivity and thermal stability of traditional polymers are generally not ideal, consequently endowing polymer-based pressure-sensitive adhesives (PSAs) with certain conductivity and heat resistance has become a popular design idea. Although multi-walled carbon nanotubes (CNTs) possess good electrical conductivity and thermal stability, thei...

In this contribution, first of all, the methoxy groups of organic solvent lignin (OSL) was converted to phenolic hydroxyl groups through demethylation reaction for the purpose of fabricating demethylated organic solvent lignin (DOSL). In addition, the resulting DOSL was utilized as a renewable material to synthesize a novel esterified lignin (EDOSL...

Although polyurethane pressure-sensitive adhesives (PSAs) have been widely used, there are still some deficiencies in adhesion and heat resistance. To make up for these shortcomings, rosin is introduced into polyurethane/polysiloxane copolymer to improve its heat resistance and adhesion, while its hydrophobicity is also improved. The vinyl-terminat...

Owing to its intrinsic structure, thermal stability and dimension effects, black phosphorene (BP) has great potential in manufacturing advanced-performance polymer composites. However, the shortcoming of instability and re-agglomeration enables great challenges toward its application. Herein, a lanthanide metal ligand ((CF3SO3)3Er) has been employe...

A series of polysiloxane-based polyurethane elastomers with aliphatic and aromatic diisocyanate structures are prepared using a two-step polymerization method. First, tolylene diisocyanate (TDI); dicyclohexylmethane 4,4′-diisocyanate (H12MDI); and hexamethylene diisocyanate (HDI) separately react with polycarbonate diol (PCDL) to produce polyuretha...

Polyurethane (PU) elastomer has been widely used in many fields. In this work, polyurethane/polysiloxane elastomers are synthesized by one-step polymerization using polyether and polyester polyols. The properties of polytetramethylene ether glycol (PTMG) and polycarbonate (PCDL) on polyurethane/polysiloxane elastomers are characterized by various t...

A series of polyurethane/cotton-cellulose nanofibers nanocomposite films are manufactured using amino-terminated polydimethylsiloxane (H2N-PDMS-NH2), polycarbonate diol (PCDL), isophorone diisocyanate (IPDI), and the dispersed cotton-cellulose nanofibers (c-CNF). The heat resistance, hydrophobicity, mechanical properties, surface morphology and eff...

In this study, we developed a multifunctional thermal management nanocomposite paper (NPG) consisting of cationic poly (diallyldimethylammonium chloride) (PDDA)-functionalized graphene oxide (PG) and nanodiamond (ND). Due to the functionalized reduction of graphene oxide (GO) by PDDA as well as electrostatic interactions between the positively char...

Black phosphorus (BP) are shining for its promising properties. Due to the instability and agglomeration problem, the surface coordination strategy is a key point in practical applications. Herein, a ruthenium sulfonate ligand is synthesized to coordinate black phosphorus (BP) nanosheets. By virtue of Ru-P coordination, the lone pair electrons in B...

Polymer-based thermal management nanocomposites with favorable electrical insulation have received increasing attention in the microelectronics industry. How to effectively disperse nanofillers and improve interfacial compatibility with polymer matrix is crucial to enhance comprehensive performance of nanocomposites. In this work, nanodiamond (ND)...

Polysiloxane-based polyurethane/lignin elastomers are synthesized via pre-polymerization. Isophorone diisocyanate (IPDI) reacts with polycarbonate (PCDL) and polydimethylsiloxane (PDMS) polyol to produce a linear thermoplastic elastomer. Lignin is added to the matrix of the polyurethane, where lignin not only acts as a crosslinking agent but also a...

Polysiloxane-based polyurethane films with cross-linked structure are synthesized by the sol-gel process using isophorone diisocyanate (IPDI), polydimethylsiloxane (PDMS), polycaprolactone (PCL) diol, and 3-aminopropyl triethoxysilane (ATS). After the ATS-terminated polyurethane prepolymer, a cross-linked network structure is formed through the pro...

In this work, we offered a facile strategy to produce lignin microspheres (LMS) with loading benzotriazole (BTA) inhibitors which were released as the pH changed. The morphological and compositional characterization demonstrated that the BTA inhibitors were efficiently encapsulated in the LMS whose load was up to 15.5 wt%. Tests of crossed scratche...

Similar to graphene, single or few-layer of black phosphorus (BP) are promising for its high thermal stability and unique characteristic dimension effects. However, the agglomeration problem of BP nanosheets in polymer matrix renders great difficulty toward its application. Herein, Melamine-formaldehyde (MF) is conducted to functionalize black phos...