Glass transition in filled polymer systems

Lipatov, Yu.S.; Privalko, V. P.

doi:10.1016/0032-3950(72)90286-9

Cited by 32 publications

(14 citation statements)

References 12 publications

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“…This can be associated with the reduction of molecular mobility of the polyurethane chains imposed by the EG particles. That is a fraction of polymer could be immobilized on the surface of the EG particles [21,22,23,24,25,26,27]. The temperature range of the glass transition (T 2 − T 1 ), which is a measure of the sample heterogeneity [18], does not show a clear trend with the composition.…”

Section: Resultsmentioning

confidence: 99%

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: Resultsmentioning

confidence: 99%

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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“…Considering DC p as a measure of the amount of polymer which involves in the glass transition, this increment is studied in terms of an immobilized polymer chain in DeVulcSBR-6. The fraction of immobilized polymer chains can be evaluated as follows [26,27] Table 1, which show that with the increasing degree of devulcanization, the fraction of immobilized polymer chains decreases. The reason for the decreasing v im with the devulcanization time and the degree of devulcanization is mainly due to the decreasing crosslink density of DeVulcSBR-6s with time.…”

Section: Differential Scanning Calorimetry Study Of Devulcsbr-6mentioning

confidence: 99%

The role of devulcanizing agent for mechanochemical devulcanization of styrene butadiene rubber vulcanizate

Ghosh

Ghorai

Bhunia

et al. 2017

Polymer Engineering & Sci

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More or less universally, bis(3-triethoxysilyl propyl) tetrasulfide (TESPT) has been used as a coupling agent during dispersion of silica filler in a virgin nonpolar rubber compound. It is for the first time that TESPT has been used as a devulcanizing agent and as-grown devulcanized rubber facilitates the silica dispersion in nonpolar rubber compound without any coupling agent. Dual functionalities of TESPT have been modeled and validated in this work. Various factors like the role of sol-gel content, inherent viscosity of sol rubber, crosslink density, and degree of devulcanization were investigated as a function of devulcanization time and amount of TESPT to optimize devulcanization time and TESPT amount. To study the silica reinforcement, revulcanization of devulcanized SBR was carried out with silica filler and the curing characteristics of the material were evaluated. From the mechanical properties and thermogravimetry analysis the optimum time for devulcanization is determined. Further, scanning electron microscopy (SEM) studies were undertaken to check the coherency and homogeneity of the material. POLYM. ENG. SCI., 58:74-85, 2018.

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“…Therefore, a fraction of polymer could be immobilized on the surface of the EG particles. (Chen, et al, 2002;Liu, et al, 2001;Sargsyan, et al, 2007;Privalko, et al, 1979;Huang, et al, 2001;Lipatov, et al, 1972;Kalogeras, et al, 2004) On the other hand, the composites heat capacity jump at T g (ΔC pnor ), normalized to the fraction of PUPH, which is a measure of the fraction polymer participating in the glass transition. This parameter is affected by two different factors: (i) the crystallization degree of the matrix and (ii) the effect of the EG particles in the polymer mobility.…”

Section: Thermogravimetric Analysismentioning

confidence: 99%

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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Glass transition in filled polymer systems

Cited by 32 publications

References 12 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

The role of devulcanizing agent for mechanochemical devulcanization of styrene butadiene rubber vulcanizate

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

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