Preparation and properties of poly(imide siloxane) segmented copolymer/silica hybrid nanocomposites

Liaw, Wen-Chang; Chen, Kuan-Pin

doi:10.1002/app.26319

Cited by 19 publications

(16 citation statements)

References 33 publications

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“…In synthesizing the PIS/silica (SiO 2 ) hybrid nanocomposite, a C-Si covalent bond was formed between the homogeneous PIS copolymer and SiO 2 with the aid of a silicon coupling agent. 18 This C-Si covalent bond was found to successfully enhance the dispersion of the inorganic SiO 2 in the organic phase and reduce the particle size to o60 nm (SiO 2 content o10 wt%). Consequently, the material's mechanical and thermal properties were significantly improved.…”

Section: Introductionmentioning

confidence: 99%

“…Some researchers have studied the preparation and properties of the binary hybrid nanocomposites PI/SiO 2 4-10 and PI/TiO 2 . [11][12][13][14][15][16][17] In our previous papers, 18,19 we reported on the preparation of binary hybrid films of poly(imide siloxane) (PIS)/SiO 2 and PIS/TiO 2 . In synthesizing the PIS/silica (SiO 2 ) hybrid nanocomposite, a C-Si covalent bond was formed between the homogeneous PIS copolymer and SiO 2 with the aid of a silicon coupling agent.…”

Section: Introductionmentioning

confidence: 99%

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Complementary functionality of SiO2 and TiO2 in polyimide/silica–titania ternary hybrid nanocomposites

Liaw

Cheng

Liao

et al. 2011

Polym J

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A polyimide (PI) composite containing SiO 2 and TiO 2 hybridized nanoparticles was prepared by the sol-gel process. Polyamic acid (PAA) solution, the precursor of PI, was synthesized from 2,2¢-bis-(3,4-dicarboxyphenyl) hexofluoropropane dianhydride and bis [4-(3-aminophenoxy) phenyl sulfone in N-methyl-2-pyrrolidone. The SiO 2-TiO 2 hybrid nanoparticles were prepared by the sol-gel process in a PAA solution into which tetraethoxysilane, titanium (IV) tetrabutoxide and acetylacetone were mixed for subsequent hydrolysis and condensation reactions. After spin coating of this solution onto a glass substrate, the stepwise imidization to PI and the simultaneous gelation of the SiO 2-TiO 2 hybrid oxides were achieved at 100-300 1C. The complementing effects of reduced particle size and enhanced thermal stability of SiO 2 and TiO 2 on the resulting nanocomposite were observed. The former effect was contributed by TiO 2 and the latter by SiO 2. Uniform dispersion of 5-to 10-nm-diameter SiO 2-TiO 2 nanoparticles was obtained in the PI matrix. A 5-lm-thick film obtained from this procedure exhibited excellent optical transparency (91%, 500 nm) at 15 wt% SiO 2 for a TiO 2 content o5 wt%.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Complementary functionality of SiO2 and TiO2 in polyimide/silica–titania ternary hybrid nanocomposites

Liaw

Cheng

Liao

et al. 2011

Polym J

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“…Those hybrids combine the beneficial properties of inorganic materials with rigidity, high thermal stability, and mechanical strength as well as the organic polymers with flexibility, ductility, and easy processability 3–5. Through sol–gel process, there are many successfully prepared polyimide (PI)/inorganic materials hybrid thin films with a wide range of material properties, such as high thermal stability, high mechanical strength, flexibility, and easy processability 6–15. Certain properties, such as high glass transition temperature ( T g ), low CTE and low dielectric constant, and hydrophobicity, are desirable for materials in modern electrical usages.…”

Section: Introductionmentioning

confidence: 99%

“…However, other properties, such as T g and CTE, are generally superior in PI hybrids containing TiO 2 . Hence, a combination of the superiority of two types of metal oxides in PI films is sought to expand the respective characteristics of inorganics and obtain better properties of PI hybrids 14,15,18. While, the reactivity of alkane metal oxides is different and ranking in the following sequence: Zr(OR) 4 , Al(OR) 3 > Ti(OR) 4 > Sn(OR) 4 >> Si(OR) 4 .…”

Section: Introductionmentioning

confidence: 99%

Properties of polyimide hybrids with mixed metal oxide

Huang

Tseng

et al. 2012

J of Applied Polymer Sci

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Polyimide/silica-titania (PI/SiO 2 -TiO 2 ) hybrid films were prepared via an in situ sol-gel process. The PI precursor, poly(amic acid) (PAA), which contains 2,2'-bis[4-(4-aminophenoxy)-phenyl]propane (p-BAPPP), 3,3',4,4'-benzophenetetracarboxylic anhydride (BTDA) and 3-aminopropyltrimethoxysilane (APrTMOS), was first synthesized; this was followed by the addition of phenyltrimethoxysilane (PTMS) and/or tetraethyl orthotitanate (Ti(OEt) 4 ) to fabricate PI/SiO 2 -TiO 2 films. The relative content of SiO 2 to TiO 2 has remarkable effects on the crosslink structure and resultant properties of the hybrids. XPS results confirm that the amount of Si on the surface of the hybrids is higher than that in the bulk. The distribution of Ti in the hybrid films is contrary to the above trend because of the formation of three-dimensional SiAOASi, SiAOATi, and TiAOATi networks. The SiO 2 content of the hybrids containing only silica significantly affects their refractive index, contact angle, and dielectric constant. The films with added PTMS show higher contact angles than pure PI because nonpolar segments, AC 2 H 6 or benzene groups, tend to distribute on the surface. Upon the addition of (Ti(OEt) 4 ), some hydrophilic segments on the surface of the hybrids are induced because of the formation of a crosslinked structure. The denser crosslinked molecular structure, and consequently lower CTE and higher T g are obtained from hybrids containing more TiO 2 . By comparing the above properties and flexibility, the best composition of metal oxides (SiO 2 /TiO 2 ) in hybrids is 20/80. That is, an optimum ratio of metal oxides in PI hybrids induces superior properties for advanced practical applications.

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“…In order to regain the compromised thermal and mechanical properties, due to the copolymerized polysiloxane, we incorporated the inorganic, nano-sized SiO 2 by sol-gel and in situ processes. 19 The obtained nanocomposite (PIS/SiO 2 ) possessed better thermal stabilities and mechanical strength than PIS copolymer. However, at high dosage of SiO 2 , there is still room for improvement in terms of the inorganic SiO 2 particle size.…”

Section: Resultsmentioning

confidence: 99%

SiO2 Reinforcement and Morphology of a Novel Poly(imide-siloxane)-Based Thermal Plastic Elastomer Composite

et al. 2009

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Silica (SiO 2 ) was used for the reinforcement of the poly(imide-siloxane) (PIS)-based thermal plastic elastomer. Trimethylsilyl modified SiO 2 was incorporated in the copolymer matrix to obtain the PIS/SiO 2 composties. In preparing the PIS/SiO 2 composite, the modified MeOH/THF solvent system provided a homogeneous reaction environment by offering good solubilities for the reactants and the intermediates while facilitating the dispersion of SiO 2 . The trimethylsilyl group modified fume silica offered excellent interfacial compatibility and kept the microphase separation at desirable level. SEM studies showed that such surface modification improved the dispersion of SiO 2 in the copolymer matrix. Morphological and thermal studies revealed the likelihood of a spatial rearrangement of the long chain alternating pyromellitic dianhydride/ polydimethyl siloxane (PMDA/PDMS) soft segments leading to a macroscopically homogeneous composite. Such spatial rearrangement further stabilized the microphase separation which is necessary for exhibiting TPE characteristics. The obtained composites have better thermal and mechanical properties than bare PIS copolymer. An elongation at break of 989% was obtained for the PIS/SiO 2 composite at silica content of 3 wt %.KEY WORDS: PIS Copolymer / Composite / Thermal Plastic Elastomer / SiO 2 Reinforcement / Morphology / Thermoplastic elastomers (TPE) are a group of materials that possess elasticity. The elasticity of a TPE is comparable to that of covalent bond crosslinked rubbers, and its meltability allows for repeated processing from melt in a way analogous to common plastics (e.g., by extrusion or injection molding). The chemical constituent of a TPE is generally a tri-block (or multiblock) copolymer, which usually provides a soft segment in the center and the hard segments in the bi-terminal portions of the coplymer. Typical examples are SBS (styrene-butadienestyrene block copolymer), SEBS (styrene-ethylene-butadienestyrene block copolymer) and TPU (thermoplastic polyurethane).1,2 In the development of new types of TPE, the chemical ingredients of the soft and hard segment as well as their spatial arrangement are important design variables for the success of their potential applications.The hard segment is one of the key components of TPE, which provides the physical crosslink points by strong intermolecular attraction when used at working temperature, but such intermolecular attraction can be reversibly dislodged by melting at high temperature. To function as the hard segment, the component polymer (or inorganic physical crosslinkers) should be easily solidified or crystallized, and at the same time, being limitedly compatible with the soft segment to maintain, at desirable level, the necessary microphase separation during copolymerization with the soft segments. Polyimides (PI) is a group of polymers and some members of PI possess such property, and have been identified as a good choice for the hard segment of TPEs. 3,4 Kricheldorf et al.3 synthesized poly(ether-ester-imides...

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Preparation and properties of poly(imide siloxane) segmented copolymer/silica hybrid nanocomposites

Cited by 19 publications

References 33 publications

Complementary functionality of SiO2 and TiO2 in polyimide/silica–titania ternary hybrid nanocomposites

Complementary functionality of SiO2 and TiO2 in polyimide/silica–titania ternary hybrid nanocomposites

Properties of polyimide hybrids with mixed metal oxide

SiO2 Reinforcement and Morphology of a Novel Poly(imide-siloxane)-Based Thermal Plastic Elastomer Composite

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