|本期目录/Table of Contents|

[1]Amel MOHAMED,张旭敏,贾红兵.苯并■嗪树脂对丁腈橡胶复合材料力学性能的影响：实验与分子模拟[J].合成橡胶工业,2024,5:439.
　Amel MOHAMED,ZHANG Xu-min,JIA Hong-bing*.Effect of benzoxazine resin on mechanical properties of nitrile rubber composites: Experiment and molecular simulation[J].China synthetic rubber industy,2024,5:439.
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苯并■嗪树脂对丁腈橡胶复合材料力学性能的影响：实验与分子模拟(PDF)

《合成橡胶工业》[ISSN:1000-1255/CN:62-1036/TQ]

期数:
2024年5期
页码:
439
栏目:
出版日期:
2024-09-15

文章信息/Info

Title:
Effect of benzoxazine resin on mechanical properties of nitrile rubber composites: Experiment and molecular simulation
文章编号:
1000-1255（2024）05-0432-05
作者:
Amel MOHAMED; 张旭敏; 贾红兵
（南京理工大学 软化学和功能材料教育部重点实验室，南京 210094）
Author(s):
Amel MOHAMED;  ZHANG Xu-min;  JIA Hong-bing*
（Key Laboratory of Soft Chemistry and Functional Materials of Ministry of Education, Nanjing University of Science and Technology, Nanjing 210094, China）
关键词:
苯并■嗪树脂; 丁腈橡胶; 增强; 力学性能; 氢键; 结合能; 自由体积分数
Keywords:
-
分类号:
-
DOI:
DOI:10.19908/j.cnki.ISSN1000-1255.2024.05.0439
文献标识码:
-
摘要:
通过实验和分子模拟研究了苯并■嗪树脂(PBR)对丁腈橡胶(NBR)复合材料力学性能的影响。结果表明，PBR对NBR复合材料具有明显的增强作用，特别是当PBR为20份（质量）时复合材料具有最多的氢键数、最高的结合能和较小的自由体积分数；与纯NBR相比，NBR/PBR 20复合材料的拉伸强度和玻璃化转变温度分别提高了55.6%和5.13 ℃。
Abstract:
Benzoxazine resin, being a new type of phenolic resin deve-loped to overcome the shortcomings of traditional phenolic resins, has been synthesized from phenol, formaldehyde and amine, and does not require solvent elimination or monomer purification to obtain a relatively clean precursor. It has potential application in the field of aerospace due to its low expansion coefficient, high weather resistance, high carbon yield, good mechanical strength, and excellent ablation resistance［1］. It can be mixed with various other resins or polymers to produce new resins with a broad range of applications［2-3］.　In this work, the mechanism of enhanced mechanical properties and dynamic mechanical properties of nitrile rubber(NBR)/polybenzoxaine (PBR) composites was investigated by combination of molecular dynamic (MD) simulation and experimental methods［4］. The composition of rubber compounds was NBR 100 phr (in mass, the same below), 4010 NA 2.0 phr, zinc oxide 2.0 phr, SA 2.4 phr, CZ 2.2 phr, sulfur 1 phr and PBR varies. These samples were named as NBR/PBR x, where x stood for the amount of PBR.　The MD simulation results showed binding energy (Ebinding), hydrogen bond (H-bond), and fractional free volume (FFV) of NBR/PBR composites, as shown in Table 1. When the PBR amount increased to 20 phr, the number of H-bond was the largest, Ebinding was the highest, and FFV was the smallest, indicating that the intermolecular interaction between PBR and NBR was the strongest, so that the molecular chains were closely packed and FFV were decreased. When the PBR amount exceeded 20 phr, the number of H-bond and Ebinding decreased and FFV increased, which was ascribed to the aggregates formed by PBR molecules.　As shown in Table 2, with the addition of PBR, tensile strength increased until it reached its highest value at PBR of 20 phr, and then decreased, but elongation at break gradually decreased. It might be attributed to the limited uniform dispersion of PBR in NBR, and PBR particles begin to aggregate exceeding a certain concentration. It might be also reasonable to assume that at the higher amount of PBR, the interphase surrounding the particles was beginning to overlap. Under higher stresses, elasticity was lost, and the material became stiffer, and most materials underwent plastic deformation process to alter their shape in a permanent way［5］. Additionly, dynamic mechanical properties of NBR and NBR/PBR composites revealed that glass transition temperature (Tg) increased with the increase of PBR amount. The reason was that increase in interaction between NBR and PBR reduced the movement of molecular chain. However, when the PBR amount exceeded 20 phr, Tg of NBR/PBR composites started to decrease, which was due to poor dispersion of PBR in NBR, resulting in a loose structure and a decrease in Tg.

参考文献/References

［1］ Yan Hongqiang, Sun Chuang, Fang Zhengping, et al. Synthesis of an intrinsically flame retardant bio-based benzoxazine resin［J］. Polymer, 2016, 97: 418-427.［2］ Ishida H, Agag T. Handbook of benzoxazine resins［M］. Ohio: Case Western Reserve University, 2011: 379-388.［3］ Chen Jiye, Kinloch A J, Sprenger S, et al. Alloys and compo-sites of polybenzoxazines［J］. Engineering Materials, 2013, 76(5): 978-981.［4］ Luo Yanlong, Wu Youping, Luo Kaiqiang, et al. Structures and properties of alkanethiol-modified graphene oxide/solution-polymerized styrene butadiene rubber composites: Click chemistry and molecular dynamics simulation［J］. Composites Science and Technology, 2018, 161: 32-38.［5］ Chen Jiye, Anthony K, Stephan S, et al. The mechanical pro-perties and toughening mechanisms of an epoxy polymer mo-dified with polysiloxane-based core-shell particles［J］. Polymer, 2013, 54(16): 4276-4289.

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更新日期/Last Update: 1900-01-01