Dielectric thermally conductive boron nitride/polyimide composites with outstanding thermal stabilities via in -situ polymerization-electrospinning-hot press method

Multi–walled carbon nanotubes (MWNTs)/polyethylene (PE) nanocomposites were prepared via in situ polymerization with MWNTs supported Cp2ZrCl2 catalyst. XPS and FESEM results imply that Cp2ZrCl2 catalyst has been immobilized in the surface of the MWNTs supports by a MAO bridge. The efficient dispersion of MWNTs in PE matrix and the strong compressive forces associated with PE on the MWNTs were demonstrated by TEM, FESEM and Raman spectra. With introducing 0.2 wt.-% MWNTs, both the tensile strength and elongation of MWNTs/PE nanocomposite increased by factors of 1.6 (from 29 MPa to 45 MPa) and 1.5 (from 909% to 1360%) comparing with the pure PE, respectively. Morphology observation of fractured surface, in accordance with the Raman results, revealed that the PE firmly adheres to the nanotubes, which is responsible for the significant improvement of the mechanical properties of nanocomposites. Thermal stabilities of the nanocomposites were significantly improved. In addition, the MWNTs/PE nanocomposites show very high UV shielding properties, which could increase photooxidative stability of the PE.

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Study of silane modified MWNT/polyimide composites by in-situ polymerization

The 4th IEEE International NanoElectronics Conference ◽

10.1109/inec.2011.5991708 ◽

2011 ◽

Author(s):

Hung-Han Ko ◽

Yao-Yi Cheng ◽

Shang-Chin Chou ◽

Pi-Sheng Ku

Keyword(s):

In Situ Polymerization ◽

Polyimide Composites

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Microwave‐assisted in situ polymerization of polycaprolactone/boron nitride composites with enhanced thermal conductivity and mechanical properties

Polymer International ◽

10.1002/pi.6000 ◽

2020 ◽

Vol 69 (7) ◽

pp. 635-643 ◽

Cited By ~ 2

Author(s):

Hongli Tian ◽

Fangjuan Wu ◽

Peng Chen ◽

Xiangfang Peng ◽

Hui Fang

Keyword(s):

Mechanical Properties ◽

Thermal Conductivity ◽

Boron Nitride ◽

In Situ Polymerization ◽

Microwave Assisted ◽

Enhanced Thermal Conductivity

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Preparation and properties of graphene oxide/polyimide composites by in situ polymerization and thermal imidization process

High Performance Polymers ◽

10.1177/0954008316634177 ◽

2016 ◽

Vol 29 (2) ◽

pp. 187-196 ◽

Cited By ~ 20

Author(s):

Lang Ma ◽

Guojian Wang ◽

Jinfeng Dai

Keyword(s):

Graphene Oxide ◽

In Situ Polymerization ◽

Curing Process ◽

Thermal Curing ◽

Solution Blending ◽

Blending Method ◽

Thermal Imidization ◽

Polyimide Composites ◽

Properties Of Composites

Graphene oxide/polyimide (GO/PI) composites with different loadings of GO were prepared by in situ polymerization and solution blending method. By adding GO, the mechanical, electrical, and thermal properties of composites could be improved. The tensile strength of GO/PI composite with 3.0 wt% GO loading was up to 137.8 MPa, 75.5% higher than that of a pure PI. Besides, the electrical and the thermal conductivities increased with the increase of GO contents. An electrical conductivity value of 5.38 × 10−5 S m−1 and a thermal conductivity value of 0.10 W m−1 K−1 for GO/PI composites prepared via in situ polymerization at GO content of 3.0 wt% were achieved. The results indicated that in situ polymerization was able to make GO a better dispersion in the polymer matrix. Furthermore, the behavior of GO under the thermal imidization temperature was also discussed. The experimental results showed that GO could be partially reduced to graphene during the thermal curing process. Above works are conducive to the understanding of the effect and transformation of GO in the preparation process of graphene-based composites.

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Reaction Synthesis of TiAl-Al2O3 Composites from Ti-Al-Cr2O3

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.211-212.209 ◽

2011 ◽

Vol 211-212 ◽

pp. 209-212

Author(s):

Jian Feng Zhu ◽

Wen Wen Yang ◽

Fang Ni Du

Keyword(s):

Solid State ◽

Titanium Aluminide ◽

Reaction Synthesis ◽

Hot Press ◽

Prepared Material ◽

The Matrix ◽

Press Method ◽

Ti Powder

Titanium aluminide composite reinforced with in situ formed submicron Al2O3 has been prepared by a reactive hot press method using Cr2O3, Al and Ti powder as starting materials. The reaction synthesis processing is particularly investigated. Results show that the matrix of the as-prepared material is a mixture of TiAl and a small amount of Ti3Al and Cr containing phase. Fine Al2O3 particles that act as reinforcing phase are dispersed along the interface of the matrix. The formation of TiAl/Al2O3 composite involves many transitional stages. Firstly, TiAl3 and Ti3Al intermediates were produced, then reducing reaction of Cr2O3 by Al formed Al2O3, and finally, the competitive solid-state diffusing reactions among Ti3Al, TiAl and TiAl3 produced the matrix phases of the TiAl/Al2O3 composite.

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