Low Thermal Expansion Composites Prepared from Polyimide and ZrW&lt;su&gt;2O8 Particles with Negative Thermal Expansion

Yamashina, Naoko; Isobe, Toshihiro; Ando, Shinji

doi:10.2494/photopolymer.25.385

Cited by 24 publications

(19 citation statements)

References 11 publications

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“…However, in some cases, such as Al 2 TiO 5 , microstructural design and microcrack formation can be used to advantage to produce low thermal expansion materials with high thermal shock resistance [10]. On the other hand, the second approach makes use of the addition of thermomiotics, as the dispersed phase, in composites [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29]. The most common role of thermomiotics in composites is to control the CTE of the matrix phase, which could be a metal, ceramic or polymer.…”

Section: Introductionmentioning

confidence: 99%

Al2Mo3O12/polyethylene composites with reduced coefficient of thermal expansion

et al. 2014

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Recently, polymer composites reinforced with low fractions of thermomiotic nanoceramics have triggered a lot of research. The efforts have been focused on achieving considerable reduction of the coefficient of thermal expansion (CTE) of polymeric materials without deterioration of other physical properties. In this context, polyethylene (PE) composites reinforced with different loads of Al 2 Mo 3 O 12 nanofillers (0.5-4 mass %) were fabricated by micro-compounding. To enhance the interfacial interaction between the two components, chemical functionalization of Al 2 Mo 3 O 12 was performed with vinyltrimethoxysilane (VTMS) prior to micro-compounding. Infrared spectroscopy and thermogravimetry demonstrated the successful grafting of VTMS on the Al 2 Mo 3 O 12 surface. The composites showed strongly decreased CTEs, up to 46 % reduction for loadings of 4 mass % compared with neat PE, suggesting intimate filler-matrix interactions. The variation of CTEs of the composites in terms of the filler fraction was successfully described by Turner's model allowing calculation of the bulk modulus of monoclinic Al 2 Mo 3 O 12 (13.6 ± 2.6 GPa), in agreement with the value obtained by an ultrasonic method. The thermal stability of the composites was improved, although the addition of functionalized fillers decreased the degree of crystallinity of the PE to a small extent. The Young's modulus and yield strength of the composites increased from 6.6 to 19.1 % and 4.0-6.0 %, respectively, supporting the existence of strong filler-matrix interactions, contributing to an efficient load transfer. Finite element analysis of thermal stresses Electronic supplementary material The online version of this article (

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Section: Introductionmentioning

confidence: 99%

Al2Mo3O12/polyethylene composites with reduced coefficient of thermal expansion

et al. 2014

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“…When ZnO NPs was loaded at 1 wt %, 5 wt %, and 10 wt %, the CTE value were reduced to 33.5 ppm/K, 31.3 ppm/K, and 30.1 ppm/K, respectively. Moreover, the TMA thermograms of the ZSQ showed no discernible transitions, which indicated that the nanosized ZnO NPs were well dispersed and the photocuring process complete . In addition, the nanoindentation results of UV‐cured LPMSQ, as well of ZnO composites, were summarized in Figure (B) As shown, both the modulus and hardness values drastically increased with increasing ZnO content.…”

Section: Resultsmentioning

confidence: 93%

“…Moreover, the TMA thermograms of the ZSQ showed no discernible transitions, which indicated that the nanosized ZnO NPs were well dispersed and the photocuring process complete. [35][36][37][38] In addition, the nanoindentation results of UV-cured LPMSQ, as well of ZnO composites, were summarized in Figure 6(B) As shown, both the modulus and hardness values drastically increased with increasing ZnO content. It was noteworthy that the modulus values obtained for ZSQ5 and ZSQ10 were substantially higher than previously studied hybrid materials, with a high modulus of 9.4 GPa.…”

Section: Thermal Properties Of Composite Filmsmentioning

confidence: 99%

Preparation of highly emissive, thermally stable, UV‐cured polysilsesquioxane/ZnO nanoparticle composites

Jeon

Lee

Kim

et al. 2015

J of Applied Polymer Sci

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A high molecular weight polysilsesquioxane (LPMSQ)/ZnO nanocomposite was prepared by blending a methacryl‐substituted polysilsesquioxane and PMMA‐coated ZnO nanoparticle (NP) followed by UV‐curing process. These LPMSQ/ZnO nanocomposites gave high thermal and mechanical stabilities originated from the rigid ladder structured siloxane backbone of LPMSQ. The polysilsesquioxane and surface‐modified ZnO nanoparticles showed excellent compatibility between MMA groups in LPMSQ‐ and PMMA‐capped ZnO nanoparticles to give well‐dispersed LPMSQ/ZnO nanocomposites. Mechanically pliant and flexible free standing films were obtained, and the photo and optical properties of these hybrid nanocomposites were examined. The high photoluminescent properties were maintained even after severe thermal treatments exceeding 400°C. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42333.

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“…The investigations introduced in this study are only a few cases. We have also studied slurries and pastes including polymer/ ceramics containing negative thermal expansion hybrid films, 59) porous magnetic filters for O 2 gas concentration, 60) and so on. It is hoped that this research will lead to scientific elucidation of present ceramic processing know-how and result in the development of higher-performance ceramic materials.…”

Section: Discussionmentioning

confidence: 99%

Evaluation and control of the interaction between inorganic particle surfaces: application to environmental functional materials

Isobe

2013

J. Ceram. Soc. Japan

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The interaction between solid surfaces was evaluated by scanning probe microscopy using a colloidal probe. The dispersant provided a repulsive force between the solid surfaces at less than 30 nm. On the other hand, the binder provided a bridging force between the solid surfaces for retraction at less than 500 nm. Because of the complicated nature of the forces acting between the surfaces, the separation distance between ceramic particles (SDP) was calculated. Moreover, the relation between the agglomeration/dispersion of Al 2 O 3 particles and the calculated SDP were discussed. As an extension of these results, Al 2 O 3 pastes were prepared for tape casting from a viewpoint of the SDP. The tape casting of nanoparticles, which is generally difficult, was successful. On the basis of these fundamental studies applied to environmental functional materials, porous ceramics having oriented pores were prepared by an extrusion method. The obtained porous ceramics demonstrate high capillary action and are used for the relaxation of an urban heat island. Porous ceramics having nano-sized pores were prepared by a slip casting method. The porous filter has CO 2 gas separation ability by using surface diffusion.

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Low Thermal Expansion Composites Prepared from Polyimide and ZrW<su>2O8 Particles with Negative Thermal Expansion

Cited by 24 publications

References 11 publications

Al2Mo3O12/polyethylene composites with reduced coefficient of thermal expansion

Al2Mo3O12/polyethylene composites with reduced coefficient of thermal expansion

Preparation of highly emissive, thermally stable, UV‐cured polysilsesquioxane/ZnO nanoparticle composites

Evaluation and control of the interaction between inorganic particle surfaces: application to environmental functional materials

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