Chunhai Chen

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Name: 陈春海; Chen, ChunHai

Organization: Jilin University , China

Department: Alan G. MacDiarmid Institute

Title: Professor(PhD)

Chemicals
References

Polymerization of poly-(amic acid) ammonium salt in aqueous solution and its use in flexible printed circuit boards

Co-reporter:Zhibo Cao, Xiaogang Zhao, Daming Wang, Chunhai Chen, Chunyan Qu, Changwei Liu, Xiang Hou, Liaoliao Li, Guangyu Zhu

European Polymer Journal 2017 Volume 96(Volume 96) pp:

Publication Date(Web):1 November 2017

DOI:10.1016/j.eurpolymj.2017.09.023

•Poly-(amic acid) ammonium salt was prepared in aqueous solution.•The properties of poly-(amic acid) ammonium salt and polyamic acid were compared.•The adhesion Properties were studied by the The micro FT-IR spectra.It is highly desirable to combine the solubility of the PI precursor in a non-polluting solvent with the high performance behavior of PIs without sacrificing processability, thermal properties and mechanical properties. In this study, we explored a new strategy based on polycondensation reactions to prepare poly-(amic acid) ammonium salt (PAAS) in aqueous solution. PAAS was synthesized using a mixture of 3,3,4,4-biphenyltetracarboxylic dianhydride and 4,4′-oxydiphthalic anhydride and a mixture of 4,4′-diaminodiphenyl ether and p-phenylenediamine. The molecular weight of PAAS, the inherent viscosity of the PAAS solution, and the thermal and mechanical properties of the obtained PI films were investigated by focusing on the polymer structures and comparing with those of the polymerization in N,N-dimethylacetamide. The PI films produced via the different polymerization methods had almost the same thermal properties. Adhesion properties of flexible copper-clad laminates (FCCLs) which were influenced by the plastic deformation and the interface condition that was investigated using Fourier-transform infrared microspectroscopy, were investigated using the peel strength test. The peel strength of the FCCLs changed little between room temperature and 200 °C, and this indicates that the obtained film that prepolymerized in aqueous solution can potentially be used for FCCLs at high temperature in the microelectronics industry.Download high-res image (38KB)Download full-size image

Multi-shape memory effect of polyimides with extremely high strain

Co-reporter:Jianan Yao;Zhao Zhang;Chunbo Wang;Shengqi Ma;Tianqi Li;Xiaogang Zhao;Daming Wang;Hongwei Zhou

RSC Advances (2011-Present) 2017 vol. 7(Issue 84) pp:53492-53496

Publication Date(Web):2017/11/16

DOI:10.1039/C7RA11399D

A simple strategy is provided to construct novel shape memory polyimides with both physical and chemical crosslinks. The resulting materials exhibited an ultrahigh strain and a multiple shape memory effect without sacrificing the shape fixity and recovery, thereby presenting its potential application in the aerospace industry.

Preparations and properties of a high performance semicrystalline copolyimide and composites reinforced with glass fiber

Co-reporter:Wei Wang;Hongwei Zhou;Dongfeng Chen;Meimei Wu;Yuntao Liu

Journal of Applied Polymer Science 2014 Volume 131( Issue 12) pp:

Publication Date(Web):

DOI:10.1002/app.40345

ABSTRACT

A semicrystalline copolyimide derived from 3,3′,4,4′-biphenyltetracarboxylic dianhydride (s-BPDA), 1,3-bis-(4-aminophenoxy)benzene (TPER), and 4,4′-oxydianiline (4,4′-ODA), end capped with phthalic anhydride (PA), was synthesized. Glass fiber reinforced composite was also prepared by impregnating powdery glass fiber with poly(amic acid) followed by solution imidization techniques. This copolyimide displayed a glass transition temperature of 202°C and a melting temperature of 373°C by differential scanning colorimeter (DSC). Crystallization and melting behaviors were investigated under nonisothermal and isothermal crystallization conditions. Double exothermic peaks were found by DSC when the copolyimide was cooled from the melt and multiple melting behaviors can be observed after the coployimide had been isothermally crystallized at different temperatures. Mechanical properties were investigated by dynamical mechanical analysis (DMA) and tensile experiments. The samples were cured at different temperatures and then tested at different temperatures. Results indicated that the copolyimide and the composite showed excellent mechanical properties. Additionally, this copolyimide also showed lower melt viscosity by rheological analysis. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40345.

A study of the thermal cure of new trifunctional phenylethynyl terminated imide oligomers with reduced cure temperatures

Co-reporter:Changwei Liu, Xiaogang Zhao, Xiaohui Yu, Wei Wang, He Jia, Yan Li, Hongwei Zhou, Chunhai Chen

Polymer Degradation and Stability 2013 Volume 98(Issue 1) pp:230-240

Publication Date(Web):January 2013

DOI:10.1016/j.polymdegradstab.2012.10.007

A series of novel trifunctional phenylethynyl terminated imide oligomers was synthesized from two new triamines, 1,3,5-tris(3-aminophenoxy-4′-benzoyl)benzene (m-TABB) and 1,3,5-tris(4-aminophenoxy-4′-benzoyl)benzene (p-TABB), and systematically compared with the corresponding bifunctional phenylethynyl terminated imide oligomer, BPEPA. DSC isothermal cure kinetics studies were performed at the cure temperature of 320 °C, 350 °C, and 370 °C by applying two different kinetic equations, and in these cases the reaction kinetics followed first order reactions below 90% conversion. The rate of the curing reaction was observed to increase with the number of functional groups, and the TABB-based oligomers showed 20 °C lower curing temperature than the BABB-based oligomer. Tgs and thermal oxidative stabilities of imide films increased with increasing the number of the functional groups in a molecule, which may partly due to the higher crosslink densities. Moreover, trimerization or tetramerization, possible main curing reaction of trifunctional phenylethynyl terminated oligomers, based on the kinetic analysis by isothermal and ramp temperature DSC and calculation of crosslink densities, formed more thermooxidatively stable aromatic ring structures than the main polyene structures appeared in monofunctional or bifuntional phenylethynyl terminated model compounds. m-TABB-based resin exhibited the best combination of melt processibilities, curing temperatures, and thermal properties.

Fabrication of size-controllable hollow nano-spheres based on polyimides composites

Co-reporter:Jing Jing, Shujiang Ding, Chengliang Zhang, Chunhai Chen, Xianhua Rao, Guodong Dang, Zhenzhong Yang, Hongwei Zhou

Materials Chemistry and Physics 2009 Volume 116(2–3) pp:330-334

Publication Date(Web):15 August 2009

DOI:10.1016/j.matchemphys.2009.04.043

In this communication, uniform and size-controllable PI composite hollow spheres were fabricated by means of in situ favorable adsorption within sulfonated polystyrene hollow sphere templates. It was calculated that more than 33 wt.% polyimides existed on the resulting composite hollow spheres, which endued them with excellent high-temperature resistance. The high carbon remaining and favorable shape reservation of the PI-based composite hollow spheres made them promising precursors of carbon hollow spheres.

Synthesis and characterization of thermally stable, high-modulus polyimides containing benzimidazole moieties

Co-reporter:Shuang Wang;Hongwei Zhou;Guodong Dang

Journal of Polymer Science Part A: Polymer Chemistry 2009 Volume 47( Issue 8) pp:2024-2031

Publication Date(Web):

DOI:10.1002/pola.23306

Abstract

A series of novel benzimidazole-containing aromatic polyimides were prepared from synthesized 5,4′-diamino-2-phenyl benzimidazole (DAPBI), and commercial dianhydrides by the conventional two-step polymerization. The obtained films were amorphous and could afford flexible, transparent, and tough films with excellent thermal and mechanical properties. They showed high levels of tension strength of up to 234 MPa, modulus of up to 5.6 GPa without any stretching. According to thermal stability measurements, the glass-transition temperatures of the polymers were observed between 329 and 425 °C. The 5% weight-loss temperatures of most polyimides were above 600 °C in nitrogen. Excellent properties of these polyimides were proved to be attributed to the rigid-rod structure and hydrogen bond of intermacromolecular. SAXS and SEM results showed self-molecular orientation caused the formation of rod-like extended conformations. It was demonstrated that high degree of supramolecular order led to the increase of thermal stability and mechanical properties of the polyimide films. © 2009 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 47: 2024–2031, 2009

Preparation and characterization of polyimide membranes containing Ag nanoparticles in pores distributing on one side

Co-reporter:Yongqiang Deng, Guodong Dang, Hongwei Zhou, Xianhua Rao, Chunhai Chen

Materials Letters 2008 Volume 62(6–7) pp:1143-1146

Publication Date(Web):15 March 2008

DOI:10.1016/j.matlet.2007.08.002

Herein, we report on the preparation and characterization of polyimide (PI) membranes containing Ag nanoparticles in pores distributing on one side. The presence of the Ag nanoparticles in the pores was confirmed by scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and Plasma Emission Spectrometer. The results showed that the pores distributed on bottom side of the membranes, and the Ag nanoparticles dispersed evenly on the wall of the pores. The pores provided excellent dispersing environment for the Ag nanoparticles. The quantities and dispersing densities of Ag nanoparticles are larger when they are prepared from silver nitrate (AgNO3) solutions with higher concentration.

Efficient dispersion of multi-walled carbon nanotubes by in situ polymerization

Co-reporter:Nantao Hu;Hongwei Zhou;Guodong Dang;Xianhua Rao;Wanjin Zhang

Polymer International 2007 Volume 56(Issue 5) pp:

Publication Date(Web):29 DEC 2006

DOI:10.1002/pi.2187

Multi-walled carbon nanotube (MWNT)-reinforced polyimide nanocomposites were synthesized by in situ polymerization of monomers in the presence of acylated MWNTs. The acyl groups associated with the MWNTs participated in the reaction through the formation of amide bonds. This process enabled uniform dispersion of MWNT bundles in the polymer matrix. The resultant MWNT–polyimide nanocomposite films were optically transparent with significant mechanical enhancement at a very low loading (0.5 wt%). Evidence has been obtained for improved interactions between the nanotubes and the matrix polymer. Copyright © 2006 Society of Chemical Industry

Facile fabrication of macroporous polyimide films with pores distributing on one side

Co-reporter:Yongqiang Deng;Hongwei Zhou;Guodong Dang;Xianhua Rao

Journal of Applied Polymer Science 2007 Volume 104(Issue 1) pp:

Publication Date(Web):22 JAN 2007

DOI:10.1002/app.25579

Herein, we report on direct preparation of macroporous polyimide (PI) films with pores distributing on one side, the method of which relies on sedimentation of ceramic spheres in polyamic acid (PAA) solutions in a gravitational field and imidization of PAA/ceramic spheres mixtures to obtain PI/ceramic spheres hybrid films followed by curing in dilute hydrofluoric (HF) acid. In this strategy, the curing of the hybrid films in HF acid leads to the formation of pores. The introduction of pores makes the room-temperature dielectric constants of the macroporous films lower than that of pure PI film. Moreover, the macroporous PI films have improved Young's moduli and higher thermal stability in nitrogen atmosphere. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 104: 261–266, 2007

Design and synthesis of a tribranched phenylethynyl-terminated aryl ether compound and its use as a reactive diluent for PETI-5

Co-reporter:Guodong Dang;Hongwei Zhou;Xianhua Rao;Wei Yang;Gang Cui;Rikio Yokota

Journal of Polymer Science Part A: Polymer Chemistry 2007 Volume 45(Issue 21) pp:4844-4854

Publication Date(Web):14 SEP 2007

DOI:10.1002/pola.22223

In this study, a tribranched, phenylethynyl-terminated aryl ether compound (Tri-PE-PAEK) was synthesized. This novel star-shaped compound exhibits a good combination of properties, such as a low melting temperature (252 °C) and good solubility in aprotic solvents, as well as a low melt viscosity (0.1 P at 280 °C). All these advantages make it a good candidate material for modern processing techniques such as resin infusion and resin transfer molding, which are the most favorable methodologies for current economical manufacturing of polymer matrix/carbon fiber composites. Furthermore, after undergoing thermal curing to yield a network at 370 °C for 1 h, a cured sample exhibited an unexpectedly higher glass transition temperature (370 °C), storage modulus retention above the glass transition temperature, and good thermal stability. In addition, this compound can be used as a reactive diluent for phenylethynyl-terminated imide oligomer, which has the molecular weight of 5000 g/mol (PETI-5) to reduce its viscosity and lower the minimum temperature of the minimum viscosity. Meanwhile, the toughness of a cured blended resin can be greatly increased with the addition of just 10% Tri-PE-PAEK to PETI-5. Further loading levels of Tri-PE-PAEK in the blending would lead to a higher storage modulus and a higher mechanical strength without compromising the thermal stability. © 2007 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 45: 4844–4854, 2007