Preparations, Thermal Properties, and <i>T</i><sub>g</sub> Increase Mechanism of Inorganic/Organic Hybrid Polymers Based on Polyhedral Oligomeric Silsesquioxanes

Xu, Hongyao; Kuo, Shiao‐Wei; Lee, Juh-Shyong; Chang, Feng‐Chih

doi:10.1021/ma0202843

Cited by 318 publications

(259 citation statements)

References 13 publications

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“…So, the presence of EG particles, at a relative smaller content, reduces the dipole-dipole interactions of PUPH molecules and, plays an inert diluent role to decrease the self-association interaction of PUPH molecules. Similar tendency has been observed in other composites [16,17,18,19,20].However, for high content (15-30 wt%) of EG particles, an increase in the T g is observed. This can be associated with the reduction of molecular mobility of the polyurethane chains imposed by the EG particles.…”

Section: Resultssupporting

confidence: 88%

An experimental study of dynamic behaviour of graphite–polycarbonatediol polyurethane composites for protective coatings

Gómez

Culebras

Cantarero

et al. 2013

Applied Surface Science

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Segmented polycarbonatediol polyurethane has been synthesized and modified with different amounts of graphite conductive filler (from 0 to 50 wt %). Thermal and Dynamical thermal analysis behavior of the composites clearly indicates the changes in polyurethane relaxations upon addition of graphite. Broadband Dielectric Spectroscopy has been used to study the dielectric properties of the composites in the frequency range from 10 −2 to 10 7 Hz and temperature window of -140 to 170 • C. Conductivity, relaxation processes associated with different molecular motions, Maxwell-Wagner-Sillars and electrode polarization are discussed and related with the graphite content.

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Section: Resultssupporting

confidence: 88%

An experimental study of dynamic behaviour of graphite–polycarbonatediol polyurethane composites for protective coatings

Gómez

Culebras

Cantarero

et al. 2013

Applied Surface Science

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“…Similar tendency has been observed in other composites (Xu, et al, 2002;Ash, et al, 2002;Bershtein, et al, 2002;Arrighi, et al, 2003;Ash, et al, 2004). However, for high content (15 to 50 wt%) of EG, the T g is similar for all these samples, but higher than that corresponding to PUPH matrix.…”

Section: Thermogravimetric Analysissupporting

confidence: 86%

A contribution to the study of the molecular mobility in polymeric materials by Thermal and Dielectric Analysis

Foj¹,

Belén²

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T h e s i s S u p e r v i s o r : P R O F . D r . M a r í a J e s ú s S a n c h i s S á n c h e z t o o b t a i n t h e d e g r e e o f D o c t o r o f P h i l o s o p h y a t t h e U n i v e r s i t a t P o l i t è c n i c a d e V a l è n c i a Prof. Dr. María Jesús Sanchis SánchezThe work presented in this thesis was carried out at the Universitat Politècnica de València and was financially supported by the Spanish Ministry of Economy and Competitiveness (Projects Nos. MAT2008-06725-C03-03 and MAT2012-33483)."Cuando quieres algo, todo el Universo conspira para que ACKNOWLEDGEMENTSTras estos años de trabajo, llega el momento de mostrar mi agradecimiento a todas las personas que me han acompañado y apoyado durante el desarrollo de mi tesis doctoral.En primer lugar, me gustaría expresar mi gratitud a mi directora de tesis María J.Sanchis por su inestimable ayuda durante todos estos años. Muchas gracias por confiar en mí, por darme esta oportunidad y por las incalculables horas invertidas tanto para el desarrollo de esta tesis como al mío propio.También me gustaría agradecer a mis estimadas compañeras Marta Carsí y Pilar Ortiz su ayuda y amistad en este largo recorrido que suponer realizar una tesis doctoral. He aprendido mucho de vosotras tanto científica como personalmente. En este punto, no puedo olvidarme de mi querida Aurora Alonso, que pese a no formar parte de nuestro grupo de investigación, me ha apoyado, aconsejado y dado su amistad durante todos estos años.Quiero mostrar mi agradecimiento a los profesores José M. García y Félix C. García ABSTRACTThe development of new and more complex polymeric materials involves challenging problems to basic sciences. The relationship between structure and molecular dynamics assumes great importance for the future development of novel technologies based on such polymers. Thus, the understanding of how small changes in the chemical structure affect the properties of the material is essential to progress in the technological and scientific area. An in-depth analysis of the molecular mobility leads to establish the structure-properties relationships. On this basis, the main aim of the present work is to study the molecular mobility of two different families of polymeric materials. For this purpose, the experimental techniques mainly used were Differential Scanning Calorimetry (DSC) and Dielectric Relaxation Spectroscopy (DRS) (Chapter 3).The first family of polymers characterized was a series of chemically cross-linked copolymers composed by Vinylpyrrolidone (VP) and Butyl Acrylate (BA) monomers. The study was divided in two parts, which are collected in Chapter 4 and 5.In the first place, Chapter 4 contains the influence of the monomer molar ratio (XVP/YBA) on the copolymer properties. Thus, a Fourier Transform Infrared Spectroscopy (FTIR) analysis verified dipole-dipole interactions between amide groups. The influence of these interactions on several parameters related to the molecular mobility was evidenced by the DSC, DRS and Dynamic Mechanical Analysis (DMA) techni...

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“…Xu et al 32,33 investigated the Tg enhancement mechanism of POSS-based hybrid polymers employing FTIR spectra and reported that a strong interaction between POSS siloxane and the polar carbonyl group contributes to a significant Tg increase. In good agreement with their observations, we also found that, for instance, the FTIR spectrum of TPU/POSS exhibited peaks at 1310-1070 cm -1 ( Figure 2).…”

Section: Differential Scanning Calorimetry (Dsc)mentioning

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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Preparations, Thermal Properties, and T_g Increase Mechanism of Inorganic/Organic Hybrid Polymers Based on Polyhedral Oligomeric Silsesquioxanes

Cited by 318 publications

References 13 publications

An experimental study of dynamic behaviour of graphite–polycarbonatediol polyurethane composites for protective coatings

An experimental study of dynamic behaviour of graphite–polycarbonatediol polyurethane composites for protective coatings

A contribution to the study of the molecular mobility in polymeric materials by Thermal and Dielectric Analysis

Thermoplastic polyurethane synthesis using POSS as a chain modifier

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Preparations, Thermal Properties, and Tg Increase Mechanism of Inorganic/Organic Hybrid Polymers Based on Polyhedral Oligomeric Silsesquioxanes

Cited by 318 publications

References 13 publications

An experimental study of dynamic behaviour of graphite–polycarbonatediol polyurethane composites for protective coatings

An experimental study of dynamic behaviour of graphite–polycarbonatediol polyurethane composites for protective coatings

A contribution to the study of the molecular mobility in polymeric materials by Thermal and Dielectric Analysis

Thermoplastic polyurethane synthesis using POSS as a chain modifier

Contact Info

Product

Resources

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Preparations, Thermal Properties, and T_g Increase Mechanism of Inorganic/Organic Hybrid Polymers Based on Polyhedral Oligomeric Silsesquioxanes