Thermo-oxygen degradation mechanisms of POSS/epoxy nanocomposites

Zhang, Zengping; Gu, Aijuan; Liang, Guozheng; Ren, Penggang; Xie, Jiangjian; Wang, Xiaolei

doi:10.1016/j.polymdegradstab.2007.08.004

Cited by 118 publications

(71 citation statements)

References 27 publications

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“…The char residue of DBA/BDM resin shows loose structure; while that of each composite is dense, and the composite with a larger content of MPSA has denser char residue. That is because a large amount of MPSA will form more amount of inert silica layer, which can act as a thermal barrier to inhibit further degradation of the inner part of the matrix [39]. That is also the reason why the composite with a larger content of MPSA has bigger experimental Y c than theoretical value.…”

Section: Thermal Propertiesmentioning

confidence: 99%

Preparation and properties of mesoporous silica/bismaleimide/diallylbisphenol composites with improved thermal stability, mechanical and dielectric properties

Hu¹,

Gu²,

Liang³

et al. 2011

Express Polym. Lett.

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New composites with improved thermal stability, mechanical and dielectric properties were developed, which consist of 2,2'-diallylbisphenol A (DBA)/4,4'-bismaleimidodiphenylmethane (BDM) resin and a new kind of organic/inorganic mesoporous silica (MPSA). Typical properties (curing behavior and mechanism, thermal stability, mechanical and dielectric properties) of the composites were systematically investigated, and their origins were discussed. Results show that MPSA/DBA/BDM composites have similar curing temperature as DBA/BDM resin does; however, they have different curing mechanisms, and thus different crosslinked networks. The content of MPSA has close relation with the integrated performance of cured composites. Compared with cured DBA/BDM resin, composites with suitable content of MPSA show obviously improved flexural strength and modulus as well as impact strength; in addition, all composites not only have lower dielectric constant and similar frequency dependence, more interestingly, they also exhibit better stability of frequency on dielectric loss. For thermal stability, the addition of MPSA to DBA/BDM resin significantly decreases the coefficient of thermal expansion, and improves the char yield at high temperature with a slightly reduced glass transition temperature. All these differences in macro-properties are attributed to the different crosslinked networks between MPSA/DBA/BDM composites and DBA/BDM resin

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Section: Thermal Propertiesmentioning

confidence: 99%

Preparation and properties of mesoporous silica/bismaleimide/diallylbisphenol composites with improved thermal stability, mechanical and dielectric properties

Hu¹,

Gu²,

Liang³

et al. 2011

Express Polym. Lett.

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show abstract

“…As showed in the Table 1, the peak temperature increases from 333.9 ± 0.1 to 352.1 ± 1.8. The increase in the thermal stability is related also to the barrier effect caused by the formation of inert silicate layers that can act as a heat transfer barrier, since POSS is an inorganic material and has lower thermal conductivity than the regular carbon segments 25 . In addition POSS tends to crystallize in two dimensions in a format of lamellar structures 26 .…”

Section: Thermal Stabilitymentioning

confidence: 99%

“…Similar behaviour was also found by Nanda et al 34 in Polyurethane/POSS Hybrid system. On the other hand, the inert silicate layers may act as a heat transfer barrier, and the thermal properties can also improved 24,25 , as can be seen in Table 1 and Table 2. Other functional groups could be formed from the isocyanate, such as the isocyanurate, which have a higher thermal stability than urethane groups 23 .…”

Section: Capillary Rheometrymentioning

confidence: 99%

Thermoplastic polyurethane synthesis using POSS as a chain modifier

Lopes

Junges

Fiório³

et al. 2012

Mat. Res.

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In this study, thermoplastic polyurethanes (TPUs) were synthesized using the one-shot process in solution. To obtain the samples n-phenylaminopropyl polyhedric oligomeric silsesquioxane (POSS) was added as a chain modifier during the synthesis in four different amounts. The samples were characterized by infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and capillary rheometry. FTIR confirm the TPU attainment due the absence of the band at ~2253 cm -1 suggesting a complete conversion of the isocyanate terminations. The TGA showed that incorporation of POSS decreased the rate of mass loss of TPU under isothermal conditions. The flexible phase showed an enhanced stability to temperature, probably due to increased phase separation between the rigid and flexible domains. The DSC showed that incorporation of 0.4 wt. (%) of POSS increased the glass transition temperature of the flexible phase. Moreover, addition of POSS modified the melting behaviour, providing samples with a higher melting enthalpy compared to neat TPU as a consequence of the formation of larger crystals. The capillary rheometry analysis revels that the POSS addition showed a clear tendency toward higher intrinsic viscosities as the amount of POSS was increased.

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“…POSS as a new kind of nanofiller which is organic-inorganic composite with nano-size and cage-like structure was added into polymer could to some extent improve materials' anti-high-temperature, anti-corrosion, surface hardness and other mechanical properties, had aroused great attentions of scientists workers [1][2][3][4][5][6] .…”

Section: Introductionmentioning

confidence: 99%

Design on Mechanical Reinforcement of POSS Reinforced Polymer Composites

Wang¹,

Liu²,

Chen³

et al. 2017

dtetr

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Abstract. POSS as a new kind of nanofiller which is organic-inorganic composite with nano-size and cage-like structure was added into polymer could to some extent improve materials' anti-high-temperature, anti-corrosion, surface hardness and other mechanical properties, had aroused great attentions of scientists workers. Reviews on the investigations that had been made on mechanism for mechanical reinforcement of Polyhedral oligomeric silsesquioxanes (POSS) reinforced polymer composites were presented. Several methods publicly published for predicted modulus of composites reinforced POSS up to now were also analyzed. Finally, the future research trends were outlined.

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Thermo-oxygen degradation mechanisms of POSS/epoxy nanocomposites

Cited by 118 publications

References 27 publications

Preparation and properties of mesoporous silica/bismaleimide/diallylbisphenol composites with improved thermal stability, mechanical and dielectric properties

Preparation and properties of mesoporous silica/bismaleimide/diallylbisphenol composites with improved thermal stability, mechanical and dielectric properties

Thermoplastic polyurethane synthesis using POSS as a chain modifier

Design on Mechanical Reinforcement of POSS Reinforced Polymer Composites

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