Journal of Vinyl & Additive Technology最新文献

{"title":"Bio-additives and bio-fillers: Latest trends and future needs","authors":"Giulia Fredi, Rudolf Pfaendner","doi":"10.1002/vnl.22064","DOIUrl":"https://doi.org/10.1002/vnl.22064","url":null,"abstract":"","PeriodicalId":17662,"journal":{"name":"Journal of Vinyl & Additive Technology","volume":"29 6","pages":"937-938"},"PeriodicalIF":2.7,"publicationDate":"2023-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71977196","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhanced performance of eco-friendly PVC by utilizing halo-benzothiazole derivatives and glucose/fatty acids esters","authors":"Reham A. Abdel-Monem,&nbsp;Samir T. Gaballah,&nbsp;Samira T. Rabie","doi":"10.1002/vnl.22059","DOIUrl":"10.1002/vnl.22059","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <p>Two halo-benzothiazoles, namely, 2-amino-6-bromo-benzo[<i>d</i>]thiazole and 2-amino-6-fluoro-benzo[<i>d</i>]thiazole were utilized to modify poly(vinyl chloride) (PVC) and gave two modified PVC samples for biomedical applications. Prepared glucose-fatty acid esters of palmitic, oleic, and octanoic acids were exploited as plasticizers to produce phthalate-free eco-friendly antimicrobial PVC. The chemical structures of all prepared compounds were confirmed via Fourier-transform infrared spectroscopy. The thermal properties of modified PVC was determined using thermo gravimetric analysis and differential scanning calorimetry while weight loss and degree of discoloration were used to assess the photostability after UV irradiation whereas references heat and UV absorbers were applied for comparison. The plasticizing effect of each glucose-fatty acid ester at 20% by weight on the mechanical properties of modified PVC was determined and referenced to diethylhexylphthalate. The results revealed that the mechanical properties as well as the thermal stability of plasticized modified PVCs were enhanced. Plasticizers migration from the polymeric matrix was also determined and the results showed low extent of migration of the prepared plasticizers. So, modified plasticized PVC samples exhibited improved physicochemical properties. Antimicrobial properties of all samples, using disc diffusion agar method, were evaluated against some Gram +ve bacteria like <i>Staphylococcus aureus</i> and <i>Streptococcus mutans</i> and Gram −ve bacteria like <i>Escherichia coli</i>, <i>Klebsiella pneumonia</i>, and <i>Pseudomonas aeruginosa</i> and fungi strains used were <i>Candida albicans</i>, <i>Aspergillus niger</i>, and <i>Aspergillus ochraceous</i>. All investigated compounds showed improved antibacterial and antifungal activities.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Highlights</h3>\u0000 \u0000 <div>\u0000 <ul>\u0000 \u0000 <li>PVC was chemically modified with two halo-benzothiazoles to obtain antimicrobial PVC.</li>\u0000 \u0000 <li>Glucose-fatty acids esters were prepared as eco-friendly plasticizers for PVC.</li>\u0000 \u0000 <li>Halo-benzothiazoles improved both the thermal- and photo-stability of PVC.</li>\u0000 \u0000 <li>Glucose-fatty acid plasticizers enhanced the mechanical properties of PVC.</li>\u0000 \u0000 <li>The extent of migration of prepared plasticizers is lower than that of reference plasticizer.</li>\u0000 </ul>\u0000 </div>\u0000 </section>\u0000 </div>","PeriodicalId":17662,"journal":{"name":"Journal of Vinyl & Additive Technology","volume":"30 2","pages":"439-455"},"PeriodicalIF":2.7,"publicationDate":"2023-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135730681","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Use of montmorillonite to improve flame retardancy, thermal stability and reducing smoke toxicity of chicken feather protein-based rigid polyurethane foam","authors":"Xu Zhang,&nbsp;Simiao Sun,&nbsp;Dehe Yuan,&nbsp;Zhi Wang,&nbsp;Hua Xie","doi":"10.1002/vnl.22062","DOIUrl":"10.1002/vnl.22062","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <p>The aim of this article is to solve the problem of improving the flame retardancy of rigid polyurethane foam (RPUF) while improving the environmental pollution caused by flame retardancy. Using the special layered structure of montmorillonite (MMT) and the stable chemical bond formed by the reaction with chicken feather (CF) protein, RPUF co-modified with MMT and CF was successfully prepared by using the “one-step method” of all-water foaming. It was found by experiments and theoretical calculations that the addition of MMT improved the flame retardancy of the samples. When 3 wt% of MMT was added, RPUF-CF1/MMT3 had the highest initial decomposition temperature and the largest activation energy, and its thermal stability was the best. In addition, RPUF-CF1/MMT3 had the smallest peak heat release rate (28.77, 32.04, and 42.18 kW/m²) and total heat release (1.87, 2.15, and 2.38 MJ/m²) at different radiation fluxes. Meanwhile, RPUF-CF1/MMT3 had the smallest smoke density (32.17 and 28.32), the largest light transmission (57.05% and 60.91%), the lowest toxic gas emission and the lowest fire risk.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Highlights</h3>\u0000 \u0000 <div>\u0000 <ul>\u0000 \u0000 <li>Flame retardant modified bioprotein-based RPUF by MMT is proposed.</li>\u0000 \u0000 <li>The flame retardant mechanism depends on the “sandwich biscuit” structure of MMT and its P<span></span>O<span></span>Si bond with chicken hair protein.</li>\u0000 \u0000 <li>MMT-modified RPUF can improve its thermal stability, flame retardancy and smoke toxicity.</li>\u0000 </ul>\u0000 </div>\u0000 </section>\u0000 </div>","PeriodicalId":17662,"journal":{"name":"Journal of Vinyl & Additive Technology","volume":"30 2","pages":"483-498"},"PeriodicalIF":2.7,"publicationDate":"2023-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136033372","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Amber extract as a bio-additive to poly(lactic acid) films: Multimethod analysis of crystallinity and stability","authors":"C. A. B. dos Santos,&nbsp;A. Ujčić,&nbsp;M. Sobótka,&nbsp;P. Jurczak,&nbsp;S. Lach,&nbsp;S. Rodziewicz-Motowidło,&nbsp;K. Szustakiewicz","doi":"10.1002/vnl.22057","DOIUrl":"https://doi.org/10.1002/vnl.22057","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <p>Poly(lactic acid) (PLA) films with 1 wt% of amber extract (AbE) as a bio-additive were obtained through solvent mixing using 1,4-dioxane, which was later evaporated. The extract, derived from the residual amber generated during jewelry manufacturing in the Gdansk region (Poland), was evaluated for its morphology and thermal response. The resulting films were transparent, and the addition of AbE imparted a yellow hue. The crystallinity characteristics of the PLA/AbE films were analyzed through FTIR, DSC, POM, and XRD results. The cold crystallization ability of PLA in the presence of AbE was assessed by comparing the films with their annealed counterparts. The annealed films demonstrated a slight increase in the crystalline phase without any change in transparency. The presence of amber extract particles impeded the formation of stable polymorph crystals within the PLA structure, leading to an expanded size distribution of spherulites and a reduced crystallization rate. Furthermore, the addition of AbE showed promise in enhancing the UV–vis blocking of PLA, as AbE particles decreased the transmission rate across the entire UV–vis spectrum.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Highlights</h3>\u0000 \u0000 <div>\u0000 <ul>\u0000 \u0000 <li>PLA thin films with 1% AbE were produced by the casting method.</li>\u0000 \u0000 <li>Amber extract from isopropanol fraction has a porous structure.</li>\u0000 \u0000 <li>PLA and amber extract exhibit homogeneous mixing in 1,4-dioxane solution.</li>\u0000 \u0000 <li>The AbE particles improved the UV–vis blocking of PLA.</li>\u0000 </ul>\u0000 </div>\u0000 </section>\u0000 </div>","PeriodicalId":17662,"journal":{"name":"Journal of Vinyl & Additive Technology","volume":"29 6","pages":"1125-1140"},"PeriodicalIF":2.7,"publicationDate":"2023-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71979903","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Improving temperature prediction during curing of thick parts of unsaturated polyester resin/reduced graphene oxide composites","authors":"Neda Yavari,&nbsp;Mehdi Poorabdollah,&nbsp;Fatemeh Bashipour","doi":"10.1002/vnl.22063","DOIUrl":"10.1002/vnl.22063","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <p>In this study, the challenges of using reduced graphene oxide in the production of thick parts were investigated. The kinetic effects of the particles on the curing reaction rate can cause the parts to fracture during curing because of the increase in internal stresses. In this regard, using various kinetic models, the trend of temperature increase in pure unsaturated polyester resin (Neat UP) and resin containing 0.5 wt% of reduced graphene oxide (UPRGO) were investigated. The heat transfer equation was solved using programming code in MATLAB software, and the results of the modeling were compared with the experimental results. In the following, the role of the variation in density, convection heat transfer, and thermal conductivity on the prediction of temperature at different points in the parts is evaluated. The results showed that the choice of kinetic model could play an effective role in predicting the temperature in the parts. Considering the density variation, changes in the thermal conductivity and convection heat transfer coefficient could play an effective role in matching the experimental and theoretical results. An increase in temperature causes a decrease in the structural regularity of the resin network, intensifies phonon scattering, and decreases in the thermal conductivity coefficient.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Highlights</h3>\u0000 \u0000 <div>\u0000 <ul>\u0000 \u0000 <li>The RGO particles have influenced the reaction rate and the temperature gradients of thick parts during curing.</li>\u0000 \u0000 <li>The influence of different parameters and kinetics during the curing process of polyester resin was observed on temperature changes.</li>\u0000 \u0000 <li>The best prediction of temperature changes was provided by Vyazovkin's model, which had a high accuracy between the experimental and theoretical results.</li>\u0000 \u0000 <li>The thermal conductivity coefficient is changed due to the changes in the contribution of the phonon thermal transport.</li>\u0000 \u0000 <li>Considering the changes in density with the conversion degree improved the agreement between the experimental and theoretical results.</li>\u0000 </ul>\u0000 </div>\u0000 </section>\u0000 </div>","PeriodicalId":17662,"journal":{"name":"Journal of Vinyl & Additive Technology","volume":"30 2","pages":"499-514"},"PeriodicalIF":2.7,"publicationDate":"2023-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135758781","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Exploring the synergistic effect of inorganic and organic particulates in polyvinyl chloride composites through comparative analysis and accelerated weathering","authors":"Ranjan Chaturvedi,&nbsp;Asokan Pappu,&nbsp;Manoj Kumar Gupta","doi":"10.1002/vnl.22061","DOIUrl":"10.1002/vnl.22061","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <p>Poly(vinyl chloride) based composite materials with two distinct reinforcements, namely calcium carbonate (CC) and marble waste (MW), along with bamboo sawdust (BSD), were made through melt processing. The experimental findings revealed that the MW filled composite exhibited higher tensile strength than conventionally used CC filled composites. Composites with CC and MW have almost similar densities and MW filled composite absorbed only 0.46% more water than unfilled PVC, and CC filled composite absorbed 0.26% less water. Accelerated weathering altered composite surface, confirmed by optical microscopy and FT-IR analysis of weathered samples revealed UV-induced breakdown products. Composites with MW and CC fillers along with BSD in it showed less reduction in strength (5.2 and 5.8 MPa respectively) after going through accelerated weathering as compared to those with only MW (7.2 MPa) and CC (6.3 MPa) fillers. This study stablishes MW's usability as a sustainable filler in PVC composites, with comparable performance to CC, even along with cellulosic fibers.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Highlights</h3>\u0000 \u0000 <div>\u0000 <ul>\u0000 \u0000 <li>Marble waste filled composite has higher tensile strength than calcium carbonate.</li>\u0000 \u0000 <li>Both composites had similar densities and MW absorbed only ~1% more water than CC.</li>\u0000 \u0000 <li>Composite with bamboo sawdust performed slightly better after accelerated weathering.</li>\u0000 \u0000 <li>MW can be used as a sustainable filler in PVC, with comparable performance to CC.</li>\u0000 </ul>\u0000 </div>\u0000 </section>\u0000 </div>","PeriodicalId":17662,"journal":{"name":"Journal of Vinyl & Additive Technology","volume":"30 2","pages":"470-482"},"PeriodicalIF":2.7,"publicationDate":"2023-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135855591","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Remarkable tailoring of thermal and dielectric properties of poly(vinyl alcohol) nanocomposite via hydrothermal grown ZnAl layer di hydroxide nanostructures and graphene fillers","authors":"Ritu,&nbsp;Manoj Kumar Patel,&nbsp;Manoj Kumar Gupta","doi":"10.1002/vnl.22056","DOIUrl":"10.1002/vnl.22056","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <p>In this work, we have synthesized the zinc-aluminum layered double hydroxide (ZnAl LDH) nanostructures using cost-effective hydrothermal technique. The ZnAl LDH and graphene-based poly(vinyl alcohol) (PVA) nanocomposites are fabricated. The crystal structure, morphology, thermal, and dielectric properties of pristine PVA and ZnAl LDH and graphene-based PVA nanocomposites films were investigated using X-ray diffraction, HR-transmission electron microscopy, thermo gravimetric analysis, and impedance analyzer. HRTEM analysis reveals the hexagonal nanoplates shape-like morphology of Zn-Al layered double hydroxides with an average thickness of 40–50 nm and size of 400–600 nm. High thermal stability was observed from ZnAl LDH and graphene-reinforced nanocomposite. Enhanced thermal stability of 250°C and low weight loss was observed from ZnAl LDH reinforced PVA-based nanocomposites compared to pristine PVA. Zn-Al LDH nanoplates-graphene-PVA based nanocomposites showed ultra-high dielectric constant (ɛ′) of 794 as compared to the ZnAl LDH-PVA nanocomposites (ɛ′ ~ 334) and pristine PVA sample (ɛ′ ~ 35). Low dielectric loss of 0.27, 0.18, 0.38 was observed for pristine PVA, ZnAl-LDH-PVA and ZnAl-LDH-graphene-PVA nanocomposites. The large enhancement of the dielectric constant and thermal stability were discussed in terms of improved crystallinity, interfacial polarization and formation of nanodipoles in the matrix. This study reveals a significant role of LDH-graphene-based hybrid nanocomposites in optoelectronics, energy storage, sensors, energy conversion and thermally stable devices.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Highlights</h3>\u0000 \u0000 <div>\u0000 <ul>\u0000 \u0000 <li>Growth of highly crystalline zinc-aluminum layered double hydroxide nanostructures.</li>\u0000 \u0000 <li>Improved thermal stability for Zn-Al LDH-graphene-PVA nanocomposites.</li>\u0000 \u0000 <li>High thermal stability from ZnAl LDH-based PVA nanocomposites.</li>\u0000 \u0000 <li>Ultra-high dielectric constant of 794 is observed from Zn-Al LDH nanoplates-graphene-nanocomposites.</li>\u0000 </ul>\u0000 </div>\u0000 </section>\u0000 </div>","PeriodicalId":17662,"journal":{"name":"Journal of Vinyl & Additive Technology","volume":"30 2","pages":"410-422"},"PeriodicalIF":2.7,"publicationDate":"2023-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136358990","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Flame retardancy, dielectric performance, pyrolysis behavior of epoxy resin and cyanate ester composites containing a multifunctional flame retardant","authors":"Xinhao Cen,&nbsp;Zhilin Cao,&nbsp;Zhengzhou Wang","doi":"10.1002/vnl.22058","DOIUrl":"10.1002/vnl.22058","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <p>In this research, a novel multifunctional flame retardant (DSF) was prepared through a reaction involving 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO), 4-amino-trifluorotoluene, and salicylaldehyde, was characterized by FTIR and ¹H NMR, and was employed to prepare a multifunctional epoxy resin and cyanate ester resin copolymer (EPCE). A comprehensive investigation was conducted to assess the mechanical performance, dielectric properties, thermal behavior, and flame retardancy of EPCE composites. The results indicate that the EPCE composite with 8 wt% DSF (EPCE/8DSF) attained a LOI value of 28.1 vol% and a V-0 rating. The EPCE/8DSF demonstrated a reduction of 25.8% in the peak heat release rate and a decrease of 25.6% in the total heat release in comparison with EPCE. In addition, the EPCE/8DSF composite demonstrated a decrease in both the dielectric constant and dielectric loss at 10 MHz, representing values of 3.58 and 0.00744, respectively. Furthermore, the incorporation of higher DSF content into the EPCE led to a decrease in mechanical properties.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Highlights</h3>\u0000 \u0000 <div>\u0000 <ul>\u0000 \u0000 <li>A multifunctional flame retardant (DSF) was prepared by Kabachnik-Fields reaction, and was used to fabricate multifunctional EPCE composites.</li>\u0000 \u0000 <li>EPCE/DSF composites have good flame retardancy.</li>\u0000 \u0000 <li>The prepared composites also have low dielectric constant and low dielectric loss.</li>\u0000 </ul>\u0000 </div>\u0000 </section>\u0000 </div>","PeriodicalId":17662,"journal":{"name":"Journal of Vinyl & Additive Technology","volume":"30 2","pages":"423-438"},"PeriodicalIF":2.7,"publicationDate":"2023-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135093200","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Preparation of phosphorus-nitrogen flame retardant DOPO-DBAPh and its flame retarded epoxy-based composites","authors":"Zejun Pu,&nbsp;Liangsong Zou,&nbsp;Fang Wu,&nbsp;Xu Wang,&nbsp;Qiuxia Peng,&nbsp;Jiachun Zhong,&nbsp;Xiaobo Liu,&nbsp;Yulu Wang,&nbsp;Yongke Pan,&nbsp;Diyong Jiang,&nbsp;ZhongPei Ning","doi":"10.1002/vnl.22055","DOIUrl":"10.1002/vnl.22055","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <p>Novel double DOPO-grafted phthalonitrile flame retardant (DOPO-DBAPh) has been successfully synthesized via solution reaction with amino-substituted phthalonitrile monomer, bisphenol A, paraformaldehyde and 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) as initial materials. The molecular structure of DOPO-DBAPh was investigated by FT-IR and ¹H-NMR spectrum. Then, the DOPO-DBAPh was added into epoxy (EP) to construct DOPO-DBAPh/EP fire-retarding composites by casting forming method. The effect of different proportions of DOPO-DBAPh/EP fire-retarding composites on the microstructure, thermal, mechanical, flame retardancy and combustion behavior was investigated. It was found that the DOPO-DBAPh/EP fire-retarding composites have a high glass transition temperature (<i>T</i>_g = 156∼179°C), and also have excellent thermal stability (<i>T</i>_5% = 331.4∼365.4°C) and high flexural strength (96.1∼139.8 MPa). When DOPO-DBAPh content is 5 wt%, the vertical burning grade and limiting oxygen index (LOI) of DOPO-DBAPh/EP composites reached V-0 and 29.6%, respectively. Furthermore, the cone calorimeter testing results showed that the addition of DOPO-BAPh can obviously inhibit the decomposition rate of cured substance at high temperature and accelerated the formation of dense carbon layer. When DOPO-BAPh content was 20 wt%, the total heat release rate (THR) and peak heat release rate (PHRR) of the DOPO-DBAPh/EP fire-retarding composites were decreased by 38.55% and 35.81% compared with that of cured EP. In a word, this work presents a good way for synthesizing economical and highly efficient flame retardant for use in the preparation of EP-based fire-retarding composites with excellent comprehensive performance.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Highlights</h3>\u0000 \u0000 <div>\u0000 <ul>\u0000 \u0000 <li>Novel phosphorus-nitrogen flame retardant (DOPO-DBAPh) is developed.</li>\u0000 \u0000 <li>5 wt% DOPO-DBAPh significantly improves the fire safety of EP resin.</li>\u0000 \u0000 <li>The DOPO-DBAPh/EP composites exhibit good thermal and mechanical properties.</li>\u0000 </ul>\u0000 </div>\u0000 </section>\u0000 </div>","PeriodicalId":17662,"journal":{"name":"Journal of Vinyl & Additive Technology","volume":"30 2","pages":"398-409"},"PeriodicalIF":2.7,"publicationDate":"2023-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135580113","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Molecular design and properties of a P-N synergistic flame retardant epoxy resin curing agent","authors":"Hengxing Cheng,&nbsp;Junhong Guo,&nbsp;Tianjing Zhao,&nbsp;Yuan Ye,&nbsp;Baoping Yang,&nbsp;Jinfeng Cui,&nbsp;Bo Mu,&nbsp;Xuemei Bao,&nbsp;Li Tian,&nbsp;Xiujun Zhang,&nbsp;Yingping Zhou","doi":"10.1002/vnl.22054","DOIUrl":"10.1002/vnl.22054","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <p>The utilization of epoxy resin (EP) is widespread across various industries. Nevertheless, its combustibility restricts its broader utilization. Additive flame retardants have proven effective in enhancing EP flame retardancy in recent decades. However, poor weather and aging resistance have always been the defects of added flame retardants. A reactive flame retardant (VPD) was synthesized from 3, 5-diamino-1, 2, 4-triazole and phenylphosphonic dichloride, and was used to prepare VPD/EP flame retardant epoxy thermosets. The mechanical properties of the VPD/EP flame retardant epoxy thermosets are lower than those of pure epoxy, because the distance between molecules of VPD is increased compared with that of DDM, the cross-linking density of the polymer after curing is decreased, and the intermolecular force is reduced. The VPD/EP flame retardant epoxy thermosets have a 40% reduction in total heat release compared to pure EP, an increase in limiting oxygen index value from 24.7% (pure EP) to 29.4%, and a V-1 rating in UL-94 testing. The obtained EP has not only good flame retardancy but also better weather resistance and aging resistance than additive flame retardants.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Highlights</h3>\u0000 \u0000 <div>\u0000 <ul>\u0000 \u0000 <li>An intrinsic flame-retardant P and N coacting EP was designed and synthesized.</li>\u0000 \u0000 <li>The intrinsic flame-retardant EP has excellent weather and aging resistance.</li>\u0000 \u0000 <li>The presence of the P, the residual char generated by combustion is denser.</li>\u0000 </ul>\u0000 </div>\u0000 </section>\u0000 </div>","PeriodicalId":17662,"journal":{"name":"Journal of Vinyl & Additive Technology","volume":"30 2","pages":"383-397"},"PeriodicalIF":2.7,"publicationDate":"2023-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134960987","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}