Promotion on the thermal and mechanical behaviors of epoxy resin using phthalonitrile and functionalized‐SiO2

IF 3.1 4区 工程技术 Q2 POLYMER SCIENCE
Shouhui Wu, Cong Peng, Zhanjun Wua
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Abstract

The phenolic‐type phthalonitrile (PN) was added to EP/DDM system in order to enhance the thermal and mechanical performance at high temperature. The influence of the added PN on the curing process of EP/DDM was studied via DSC and the activating energy (Eα) was calculated based on iso‐conversional method. The Eα values corresponding to EP/DDM crosslink reaction remained at about 60 kJ mol−1 while it dramatically increased to 68.2 kJ mol−1 when PN content reached 50 wt% (EP‐PN50). The Tg and char yield at 700°C in N2 increased from141°C, 25.7%, for the neat EP/DDM to 226°C, 68.7% for the EP‐PN50. The measured char yields of the cured blend were higher than the calculated values which implies the interaction between EP/DDM and polyphthalonitrile network. The tensile and bending tests were carried out at 413 K and the modulus of EP‐PN50 remains 2.3 Gpa. On the meantime, the cyano‐functionalized SiO2 (CNSiO2) was prepared to further promote the mechanical behaviors of this resin blend in high temperature. The contact angles of raw SiO2, KH560SiO2, CNSiO2 with EP‐PN50 are 59.3, 52.6, 49.7°, respectively, which confirms the better wettability of CNSiO2 to the EP/PN blend. Furthermore, the tensile and bending tests conducted at 413 K confirmed that the CNSiO2 was more efficient on enhancing the mechanical performance of this EP/DDM/PN system at high temperature.
利用邻苯二腈和功能化二氧化硅促进环氧树脂的热性能和机械性能
为了提高 EP/DDM 在高温下的热性能和机械性能,在 EP/DDM 系统中添加了酚醛型邻苯二腈(PN)。通过 DSC 研究了添加的 PN 对 EP/DDM 固化过程的影响,并根据等转换法计算了活化能(Eα)。与 EP/DDM 交联反应相对应的 Eα 值保持在 60 kJ mol-1 左右,而当 PN 含量达到 50 wt%(EP-PN50)时,Eα 值则急剧增加到 68.2 kJ mol-1。在 700°C 的 N2 中,纯 EP/DDM 的 Tg 和产炭量分别从 141°C 和 25.7% 上升到 226°C 和 68.7%(EP-PN50)。固化混合物的实测产炭量高于计算值,这意味着 EP/DDM 与聚酞腈网络之间存在相互作用。拉伸和弯曲测试在 413 K 下进行,EP-PN50 的模量仍为 2.3 Gpa。同时,为了进一步提高该树脂混合物在高温下的机械性能,制备了氰基官能化 SiO2(CNSiO2)。原始 SiO2、KH560SiO2、CNSiO2 与 EP-PN50 的接触角分别为 59.3、52.6、49.7°,这证明 CNSiO2 对 EP/PN 共混物具有更好的润湿性。此外,在 413 K 下进行的拉伸和弯曲测试证实,CNSiO2 在高温下更有效地提高了 EP/DDM/PN 系统的机械性能。
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来源期刊
Polymers for Advanced Technologies
Polymers for Advanced Technologies 工程技术-高分子科学
CiteScore
6.20
自引率
5.90%
发文量
337
审稿时长
2.1 months
期刊介绍: Polymers for Advanced Technologies is published in response to recent significant changes in the patterns of materials research and development. Worldwide attention has been focused on the critical importance of materials in the creation of new devices and systems. It is now recognized that materials are often the limiting factor in bringing a new technical concept to fruition and that polymers are often the materials of choice in these demanding applications. A significant portion of the polymer research ongoing in the world is directly or indirectly related to the solution of complex, interdisciplinary problems whose successful resolution is necessary for achievement of broad system objectives. Polymers for Advanced Technologies is focused to the interest of scientists and engineers from academia and industry who are participating in these new areas of polymer research and development. It is the intent of this journal to impact the polymer related advanced technologies to meet the challenge of the twenty-first century. Polymers for Advanced Technologies aims at encouraging innovation, invention, imagination and creativity by providing a broad interdisciplinary platform for the presentation of new research and development concepts, theories and results which reflect the changing image and pace of modern polymer science and technology. Polymers for Advanced Technologies aims at becoming the central organ of the new multi-disciplinary polymer oriented materials science of the highest scientific standards. It will publish original research papers on finished studies; communications limited to five typewritten pages plus three illustrations, containing experimental details; review articles of up to 40 pages; letters to the editor and book reviews. Review articles will normally be published by invitation. The Editor-in-Chief welcomes suggestions for reviews.
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