Materials Today Chemistry
·
2024
·
IF 6.7
Lihong Liu,Yan Zhang,Tengteng Wang,Changchang Ma,Zhengping Fang,Deyi Wang
Chloroprene rubber (CR) is one of the widely used materials due to its excellent performance. However, it will evolve large amounts of smoke and toxic gas during its combustion, which may cause smoke inhalation even human deaths in the populated enclosed spaces like rail transit, etc. Aiming to improving the fire safety of CR, the effects of zinc borate (ZnB) and antimony trioxide (Sb 2 O 3 ) alone and their combination on the flame retardancy, smoke suppression, and toxicity inhibition of CR are investigated. The performances of CR/ZnB, CR/Sb 2 O 3 and CR/ZnB/Sb 2 O 3 were analyzed by limiting oxygen index (LOI), UL94 rating and cone data. The results showed that the combination of ZnB and Sb 2 O 3 can integrate their advantages to exhibit the higher LOI and flame retardancy index (FRI) values as well as toxicity inhibition ability, indicating their good fire retardancy feature. The corresponding mechanism including the flame retardant mechanism and Lewis acid function was discussed in detail.
研究领域:
材料科学
·
消防安全
✓ 已验证
DOI
高影响因子
Radiation Effects and Defects in Solids
·
2024
·
IF 1.1
Xue-Liang Ni,Jia-Le Li,Jia-Hao Lv,Zhi-Jie Liao,Chen Yang,Jun Zeng,Ying-Jun Li,Yin-Tao Li,Yuan-Lin Zhou,Quan-Ping Zhang
Achieving lead-free flexible materials with excellent γ-ray shielding as well as good mechanical properties are of significance to radiation protection safety and wear comfort of wearable articles. In this paper, polydopamine (PDA) is coated on Bi2O3 particles to form a typical core–shell structure Bi2O3@PDA, which is used to intensely bond bismuth oxide (Bi2O3) with chloroprene rubber (CR). It promotes the interface interaction between Bi2O3 and CR matrix, leading to the uniform dispersion of the filler and rich interfacial compatibility in CR/Bi2O3@PDA composite with as high as 50 wt% filling. Furthermore, 50 wt% CR/Bi2O3@PDA composite displays 53.6% shielding rate for 105 keV γ-rays. Meanwhile, its tensile strength and elongation at break are 9.6 MPa and 1424.8%, respectively, which are without sacrificing too much in comparison with the neat rubber. We propose a versatile route to prepare superior integrated properties of flexible materials, which can be used as wearable articles for radiation shielding.
研究领域:
材料科学
·
辐射防护
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 141
·期 2
·e54782
·
IF 3
Jun Zeng,YingJun Li,YingChun Lu,YunPeng Li,HuiPing Liu,CongXiu Wu,MengXi Chen,Wei OuYang,YiPeng Zhang,YuanLin Zhou
As a “green” radiation protection material with the potential to replace lead oxide, bismuth oxide has more research applications in the field of γ protection. However, due to their different surface properties, there are compatibility and interaction problems between metal oxides and rubber. To enhance the performance of bismuth oxide in neoprene, Bi 2 O 3 @PCPA-KH590 was prepared by coating bismuth oxide with polyphenol/polyamine and grafting KH590 on the surface of bismuth oxide. This allows for creating more active sites with the help of polyphenol/polyamine, enabling KH590 to be grafted onto bismuth oxide particles. The S functional group on the silane coupling agent is then cross-linked with the rubber substrate, enhancing the dispersibility of the bismuth oxide powder. This improvement not only improves the dispersibility of the bismuth oxide powder but also enhances the mechanical properties of the rubber composite material. Compared with pure CR, the mechanical properties of 60 wt% filler-modified powder composites can still be maintained at a high level, with the tensile strength reaching 12.83 Mpa. In sum, the proposed method appears feasible for preparing highly filled radiation protection rubber-based materials.
研究领域:
材料科学
·
辐射防护
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2024
·Vol. 16
·期 4
·462
·
IF 4.7
Junhua Chen,Zhenxian Wu,Qingwei Wang,Chuanghui Yang,Jinlian Chen,He Zhang,Yinping Wu,Dong-Yu Zhu,Xiangying Hao
Water-based chloroprene latex is a solvent-free, environmentally friendly adhesive. Currently, its market demand is growing rapidly. However, there are problems such as a lack of heat resistance and poor mechanical properties, which limit its application. The introduction of vinyl-POSS (OVS) into the resin structure can effectively improve the thermal stability of chloroprene adhesives. In this paper, modified waterborne chloroprene latex was prepared by copolymerization of methyl methacrylate and OVS with chloroprene latex. The results showed that vinyl-POSS was successfully grafted onto the main chain of the waterborne chloroprene latex, and the modified waterborne chloroprene latex had good storage stability. With the increase in vinyl-POSS, the tensile strength of the chloroprene latex firstly increased and then decreased, the tensile property (peel strength of 20.2 kgf) was maintained well at a high temperature (100 °C), and the thermal stability of the chloroprene latex was improved. When the addition amount was 4%, the comprehensive mechanical properties were their best. This study provides a new idea for the construction of a new and efficient waterborne chloroprene latex system and provides more fields for the practical application of waterborne chloroprene latex. This newly developed vinyl-POSS modified chloroprene latex has great application potential for use in home furniture, bags, and seat cushions.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 42
·27633-27640
·
IF 4.036
Jianliang Jiang,Junxue Zhai,Lingxin Kong,Dongqi Zhao,Yakai Feng
The tensile strength and elongation at break of rubbers are mutually restrictive factors. Design and preparation of chloroprene rubber (CR) with high tensile strength, high elongation at break and excellent flame retardancy at the same time is challenging. Melamine cyanurate (MCA) is for the first time discovered to be a reactive flame retardant for CR. The tensile strength of C-M36 (with 3 wt% ZnO and 36 wt% MCA) vulcanizate is 2.5 times that of C-M0 (only with 3 wt% ZnO) vulcanizate, while the elongation at break of C-M36 vulcanizate is 1.3 times that of ZnO cross-linked C-M0 vulcanizate. At the same time, the limiting oxygen index of C-M36 (39%) is 1.22 times that of C-M0 (32%). FTIR and the vulcanization tests confirm that the reaction between CR and cyanuric acid occurs under the catalysis of a base (melamine), and the cyanuric acid molecules are grafted onto the molecular chain of CR. Two types of crosslinking networks are formed in CR vulcanizate, namely the traditional covalent bond crosslinks and the triple hydrogen crosslinks formed between cyanuric acid and melamine. Thus, the flame-retardant CR/MCA vulcanizate with high strength and high elongation at break is obtained. This research will strongly promote the industrial application of CR.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER COMPOSITES
·
2023
·
IF 5.2
Ruiyin Liu,Zepei Yan,Ming Liu,Hanbing Lu,Xiaoyun Han,Luyao Su,Shugao Zhao,He Wang
Considering the toxicity of traditional resorcinol-formaldehyde-latex (RFL) dipping solution used to prepare fiber- reinforced rubber composites, a novel eco-friendly dopamine (DA)-supported dipping system was developed in this study. Based on the interactions between DA, glycerol triglycidyl ether (GTE), and m -xylylenediamine (MXDA), the dipping solution successfully coated the surface of the nylon-66 (PA66), and the resulting GTE/DA/MXDA/latex-treated PA66 (PA66-GDML) possessed better thermal stability than untreated PA66. The interfacial adhesion between PA66 and neoprene was significantly improved by using the appropriate interfacial layer and the synergistic effect during co-vulcanization. The adhesive strength between PA66-GDML and neoprene was comparable to that obtained in an RFL system, especially when the ratio of GTE/DA/MXDA was 5:1:2. Highlights An eco-friendly dopamine-supported dipping system was developed. The dipping solution (GTE/DA/MXDA) could successfully coat nylon 66 fibers. Treated nylon 66 possessed better thermal stability than untreated nylon 66. The adhesive strength was comparable to that obtained in a RFL system. The new dipping system shows great potential to replace RFL system.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2024
·
IF 8.1
Shaopeng Yu,Ya Liu,Jiangyong Cao,Shibao Wen,ZhenXiu Zhang
The development of efficient and environmentally friendly rubber foams is crucial for reducing fire hazards and protecting lives and property. Herein, this study developed a green microcellular foaming method for lightweight and high-strength chloroprene rubber (CR) flame-retardant foams. A strategy that actively releases H 2 O and rapidly forms carbon to stop flames is proposed by low-toxicity smoke suppression aluminum hydroxide (ATH) and readily carburizable Zinc borate (ZB) as flame retardants. Based on the quantitative information of the cellular structure, the effects of ATH and ZB on the foaming behaviors of CR foams were investigated. Thanks to its excellent compounding effect, a significant increase in the limiting oxygen index up to 36.5 % is achieved with a density of 0.263 g/cm 3 . It also demonstrated excellent smoke suppression with a low total smoke production of 0.19 m 2 , a reduction of 96.6 % compared to pure CR foam. In addition, the incorporation of ATH and ZB effectively improves its mechanical properties and thermal conductivity. This study provides a new path manufacture CR foam with excellent overall performance, which effectively improve the overall safety and energy efficiency of the building.
研究领域:
材料科学
·
高分子化学
·
防火材料
✓ 已验证
DOI
高影响因子
International Journal of Smart and Nano Materials
·
2023
·
IF 3.9
Jianliang Jiang,Junxue Zhai,Yanqing Chen,Dongqi Zhao,Yakai Feng
For sustainable application of chloroprene rubber (CR), a new technology is developed by the vulcanization of CR using 2,2’-dithiodipyridine (DPD) as a cross-linking agent with the reprocessing performance owing to disulfide metathesis. When DPD was incorporated into CR vulcanization, the Menschutkin reaction between allyl chloride group and pyridine group occurred with a maximum exothermic peak at 184°C. The number of effective cross-linking bond at 0.5 phr DPD vulcanizate was higher than that at high DPD content. This vulcanizate showed high tensile strength (11.12 MPa) and elongation at break (1253 ± 120%) owing to the exchangeable disulfide bond in the system. Under the catalysis of triphenylphosphine, the metathesis of disulfide compound was improved obviously, which endowed CR/DPD vulcanizates with good recyclability performance. Disulfide cross-linkage maintains its stability at low temperature, thus ensuring the mechanical stability of CR/DPD vulcanizate under the ambient conditions. Vulcanization and reprocessing of CR/DPD vulcanizate can be conducted with common industrial rubber processing equipment. Such reprocessable chloroprene rubber could have potential application in CR industry, also serve to significantly improve environmental sustainability.
研究领域:
材料科学
·
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）