Isostructural softening of the filler network in SBR/silica nanocomposites

Soft Matter ◽  
2019 ◽  
Vol 15 (15) ◽  
pp. 3122-3132 ◽  
Author(s):  
Giang Hoang Trinh ◽  
Marlène Desloir ◽  
Fabien Dutertre ◽  
Jean-Charles Majesté ◽  
Florent Dalmas ◽  
...  
Keyword(s):  
Coupling Agents ◽  
Polypropylene Glycol ◽  
Silica Nanocomposites ◽  
Silica Fillers ◽  
Filler Network ◽  
New Formulation

A new formulation of the widely used nanocomposites based on SBR (ca. 250 kg mol−1) and fractal silica fillers is proposed by substituting the usual covering and coupling agents with short chains (4 kg mol−1) of polypropylene glycol (PPG).

Isostructural softening of vulcanized nanocomposites

Soft Matter ◽  
2020 ◽  
Vol 16 (13) ◽  
pp. 3180-3186 ◽  
Author(s):  
Guilhem P. Baeza ◽  
Florent Dalmas ◽  
Fabien Dutertre ◽  
Jean-Charles Majesté
Keyword(s):  
Present Report ◽  
Silica Nanocomposites ◽  
Filler Network

Following previous work evidencing that short PPG chains incorporated into crude SBR/silica nanocomposites act as filler-network softeners without changing their structure, we propose in the present report to examine more operative vulcanized materials.

scholarly journals Influence of Silane Coupling Agents on Filler Network Structure and Stress-Induced Particle Rearrangement in Elastomer Nanocomposites

2020 ◽  
Vol 12 (42) ◽  
pp. 47891-47901
Author(s):  
Dillon Presto ◽  
John Meyerhofer ◽  
Grant Kippenbrock ◽  
Suresh Narayanan ◽  
Jan Ilavsky ◽  
...  
Keyword(s):  
Network Structure ◽  
Coupling Agents ◽  
Silane Coupling Agents ◽  
Particle Rearrangement ◽  
Silane Coupling ◽  
Filler Network

AFM Studies on Silica Dispersion in EPDM Rubber

2010 ◽  
Vol 83 (2) ◽  
pp. 123-132 ◽  
Author(s):  
N. Natchimuthu
Keyword(s):  
Epoxy Resin ◽  
Coupling Agents ◽  
Epdm Rubber ◽  
Force Microscopy ◽  
Precipitated Silica ◽  
Morphological Studies ◽  
Atomic Force ◽  
Rubber Compounds ◽  
Silica Fillers ◽  
Silica Dispersion

Abstract EPDM rubber formulations filled with precipitated silica and cross-linked by peroxide vulcanization have been investigated with the objective of realizing better processing characteristics and vulcanizate properties. Dispersion of silica in EPDM rubber in the presence of conventional coupling agents and in the presence of an epoxy resin has been investigated using atomic force microscopy (AFM) and scanning electron microscopy (SEM). AFM results of EPDM rubber compounds containing silica fillers in the presence of the epoxy resin have exhibited improved silica dispersion in terms of scanned height. The latter has been found to be in the range of 0–100 nm for EPDM rubber—silica systems with epoxy resin, while in the absence of the resin, scanned height has been found to be in the range of 0–700 nm. The significant reduction in scanned height in the presence of epoxy resin has been attributed to the reduction in surface roughness which is an indication for good dispersion of silica in the rubber. Morphological studies using SEM, mechanical properties, and Mooney-Rivlin constants all have shown significant improvement in performance properties of EPDM rubber—silica compounds containing epoxy resin and vulcanized with dicumyl peroxide.

Viscoelasticity and Structure of Polystyrene/Fumed Silica Nanocomposites: Filler Network and Hydrodynamic Contributions

Langmuir ◽  
2010 ◽  
Vol 26 (4) ◽  
pp. 2714-2720 ◽  
Author(s):  
Giovanni Filippone ◽  
Giovanni Romeo ◽  
Domenico Acierno
Keyword(s):  
Fumed Silica ◽  
Silica Nanocomposites ◽  
Filler Network

Adult’s Total Parenteral Nutrition: Initiative and Implementation of Standardized Formulation in Saudi Arabia

2018 ◽  
Vol 4 (3) ◽  
pp. 483-487
Author(s):  
Yousef Ahmed Alomi ◽  
Hussam Saad Almalki ◽  
Aisha Omar Fallatah ◽  
Awatif Faraj Alshammari ◽  
Nahedh Rashed Alotaibi
Keyword(s):  
Saudi Arabia ◽  
Parenteral Nutrition ◽  
Pharmacy Practice ◽  
International Standards ◽  
Kingdom Of Saudi Arabia ◽  
Parental Nutrition ◽  
International Regulations ◽  
One Year ◽  
New Formulation ◽  
New System

The general administration of pharmaceutical care started potential pharmacy practice program. The program is part of accreditation professional’s process of national and international regulations. The adult’s parenteral nutrition was one of the critical programs. The most healthcare professionals are not familiar with the new system. The new initiatives system adult’s standardized concentration formulation of total parental nutrition as complementary to the previous one. The new formulation consisted of all parental nutrition requirements based on national and international standards. The new system can be converted as computerized physician orders. The new initiatives may implement as project management model over one year or less than that’s. The new system prevents nutrition-related problems, and medication errors, and improve clinical outcomes of the adults’ population in the Kingdom of Saudi Arabia.

L'esperienza clinica con Levometadone nel trattamento del disturbo da uso di oppiacei

MISSION ◽  
2019 ◽  
pp. 54-57
Author(s):  
Marco Riglietta ◽  
Paolo Donadoni ◽  
Grazia Carbone ◽  
Caterina Pisoni ◽  
Franca Colombi ◽  
...  
Keyword(s):  
Adverse Events ◽  
Real Life ◽  
Opioid Use Disorder ◽  
Racemic Mixture ◽  
Opioid Use ◽  
The Real ◽  
New Formulation

In Italy, at the end of the 1970s, methadone hydrochloride was introduced for the treatment of opioid use disorder, in the form of a racemic mixture consisting of levomethadone and dextromethadone.In 2015 Levometadone was introduced, a new formulation marketed in Italy for the treatment of opioid use disorder in 2015.The article aims to bring the experience of an Italian Addiction Centre back to the use of this new formulation in the "real life" analyzing the efficacy, the trend of adverse events and pharmacological iterations in a context in which the treated population often uses besides the opiates, cocaine and alcohol, are burdened by a relevant physical and psychic comorbidity and frequently have a prescribed polypharmacy.

Novel Coupling Agents for Silica-filled Rubbers with Superior Processing Safety and Improved Hysteresis of the Vulcanizates

2010 ◽  
Vol 38 (1) ◽  
pp. 80-98 ◽  
Author(s):  
M. Gerster ◽  
C. Fagouri ◽  
E. Peregi
Keyword(s):  
Mixing Time ◽  
Cost Savings ◽  
Coupling Agents ◽  
Tire Industry ◽  
Selective Functionalization ◽  
Current State ◽  
Rubber Compounds ◽  
Volatile Organic ◽  
Filled Rubbers ◽  
Ethanol Removal

Abstract One challenge facing green tire technology is to achieve good silica hydrophobation/dispersion within the polymer matrix without a detrimental increase in the rubber compound’s viscosity during compounding. This phenomenon is well known to be induced by premature and unwanted coupling and/or crosslinking of the traditional coupling agents. The current state-of-the-art polysulfides silanes, bis(3-triethoxysilylpropyl)tetrasulfide and to a lesser extent bis(3-triethoxysilylpropyl)disulfide (“Product Application—VP Si 75/VP X 75-S in the Rubber Industry,” Degussa Hüls Report No. PA 723.1E), need to be carefully incorporated with careful temperature control during the rubber compounding to prevent this “scorchy” behavior. This paper will present novel monofunctional silanes which are suited for preparing highly silica-loaded rubber compounds of superior processability, while applying fewer mixing passes, thereby reducing mixing times which can lead to improved productivity and cost savings. Additionally, these safer coupling agents can be processed at higher temperatures which can, again, lead to reduced mixing time and better ethanol removal thereby improving the tire’s physical properties and reducing the volatile organic compounds generated during the tire’s use. The rubber compounds produced using these monofunctional silanes are characterized by lower Mooney viscosity and improved processability. Advantageously, within these novel chemical classes of coupling agents, selective functionalization of the silanes allows production of tailor-made coupling agents which can respond to the specific requirements of the tire industry (Vilgis, T. A. and Heinrich, G., “Die Physic des Autoreifens,” Physikalische Blätter, Vol. 57, 2001, pp. 1–7).

TRADISI AKADEMIK DALAM KHALAQAH TAFSI>R (Orientasi Semantik al-Qur’an Klasik alam Diskursus Hermeneutik)

2016 ◽  
Vol 1 (1) ◽  
pp. 93
Author(s):  
Syamsul Wathani
Keyword(s):  
New Formulation

This article discusses Qur’anic semantic within hermeneutic discourse. The classical interpretation of the Qur’an (I-IV H) are set to be the sobject matter to be discussed within the framework of hermeneutic. By doing so, the article is expected to contribute to give a new formulation about the classical interpretation discourse on the Qur’an. Besides, the article is also expected to discover the new theory about Qur’anic hermeneutic which operated in the sphere of text. The classical Qur’anic semantic has shown the contestation which not only dit it appear in the sphere of meaning (dilalah), but more deeply in played a dialecticsof language between oral notion (al-Qur’an/kalam) and the recipient (khitab al-Qur’an).

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