Epoxy Resins Modified by Hyperbranched Polyurethanes with Different Composition

Dong Hui-hui; Zhu Xin-yuan

doi:10.11777/j.issn1000-3304.2017.16290

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Epoxy Resins Modified by Hyperbranched Polyurethanes with Different Composition

Research Article | 更新时间：2021-05-18

- Epoxy Resins Modified by Hyperbranched Polyurethanes with Different Composition
- Acta Polymerica Sinica Issue 2, Pages: 342-350(2017)
- 作者机构：
  
  上海交通大学化学化工学院上海 200240
- 作者简介：
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2017.16290
  CLC：
- Published：20 February 2017，
  
  Received：18 September 2016，
  
  Revised：13 November 2016，
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Dong Hui-hui, Zhu Xin-yuan. Epoxy Resins Modified by Hyperbranched Polyurethanes with Different Composition. [J]. Acta Polymerica Sinica (2):342-350(2017)
DOI：

Dong Hui-hui, Zhu Xin-yuan. Epoxy Resins Modified by Hyperbranched Polyurethanes with Different Composition. [J]. Acta Polymerica Sinica (2):342-350(2017) DOI： 10.11777/j.issn1000-3304.2017.16290.

摘要

利用芳香族二元异氰酸酯和脂肪族二元异氰酸酯分别与二乙醇胺反应，设计合成了不同化学组成的超支化聚氨酯，考察了其对环氧树脂的改性作用.运用核磁共振、傅里叶红外光谱（FTIR）、扫描电子显微镜（SEM）、弯曲、拉伸、冲击强度、储能模量、示差扫描量热法（DSC）以及热失重（TGA）等对超支化聚氨酯的结构及其性能进行了证实和表征，并发现基于芳香族超支化聚氨酯改性的环氧树脂共混体系表现出均相结构，而脂肪族超支化聚氨酯和环氧树脂共混后却形成了非均相体系.均相的共混体系证明超支化聚合物自身能够有效地改善环氧树脂的力学性能和热学性能.

Abstract

Hyperbranched polyurethane (HBPU)

with highly branched three-dimensional topological structures and outstanding mechanical properties

have recently received increasing attention in the modification of epoxy resins. Herein

HBPUs with different composition were synthesized and added into epoxy resins. Homogenous blending system and heterogeneous blending system were obtained by incorporating different HBPUs. The effect of micro-phase separation on toughening epoxy resins was removed by the homogeneous system

which proves the HBPU modifying epoxy resins. Aromatic hyperbranched polyurethane (M-HBPU) and aliphatic hyperbranched polyurethane (H-HBPU) were prepared through the reaction of diethanolamine with aromatic diisocyanate (MDI) and aliphatic diisocyanate (HDI) respectively

and the obtained polymers were added into epoxy resin as modifiers to make samples for test. The structures of the M-HBPU and H-HBPU were confirmed by Fourier transform infrared spectroscopy (FTIR) and nuclear magnetic resonance spectroscopy (NMR). The micro-phase structures were studied by scanning electronic microscopy (SEM) and the images showed that the blending of M-HBPU and epoxy resin was homogeneous after curing

while the blending of H-HBPU and epoxy resin was phase-separated. The mechanical properties

including flexural strength

impact strength

tensile strength and storage modulus

of the modified epoxy resins were improved after the treatment with both M-HBPU and H-HBPU. There was an optimal amount of the hyperbranched polyurethanes in the modified epoxy resin system. Meanwhile

differential scanning calorimetry (DSC) and thermal gravimetric analysis (TGA) results revealed that the thermal performance of epoxy resins per-treated with the M-HBPU was enhanced markedly

as compared with the pure epoxy resins. The homogeneous phase system of epoxy resins was obtained successfully after the modification with M-HBPU. All these results indicated that the mechanical properties and thermal performances of the modified epoxy resin could be improved directly by M-HBPU without the effect of micro-phase separation.

关键词

超支化聚氨酯环氧树脂改性微相结构

Keywords

Hyperbranched polyurethaneEpoxy resinModifyMicro-phase structurey

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Beijing National Laboratory for Molecular Sciences, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871

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Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences

School of Chemical Engineering and Technology, Sun Yat-sen University

State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University

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