Polymer Chain Length and Branching Effects on the Viscoelastic Bulk Modulus and Structural Recovery at High Pressure Sindee L. Simon, Texas Tech University,

Slides:

Advertisements

Similar presentations

PHYS466 Project Kyoungmin Min, Namjung Kim and Ravi Bhadauria.

Advertisements

Determination of Creep Mechanisms and Modeling Low Temperature Creep of Two-Phase Titanium Alloys Sreeramamurthy Ankem, University of Maryland, College.

Non-Liquidlike Behaviors in Molten Polymer Films Non-Liquidlike Behaviors in Molten Polymer Films Ophelia Tsui, Boston University, DMR Log-log.

Apparent Mass Uptake Measurements in Thin Polymer Films Using a Quartz Crystal Microbalance: Errors Induced by Film Expansion Stresses Lameck Banda, Mataz.

Block-Random Copolymers Richard A. Register, Princeton University, DMR Block copolymers spontaneously form an internal nanoscale structure, which.

Stress Relaxation of Comb Polymers Keith M. Kirkwood a, Dimitris Vlassopoulos b,c, and L. Gary Leal a a Department of Chemical Engineering, University.

K. Linga Murty, North Carolina State University Project # MET DMR  The main objectives of this project are to a) study the effect of alloying.

Electronic structure and mechanism for martensitic transformation in in Co 2 NiGa Shape Memory Alloys. Computational and Experimental Design of Novel CoNiGa.

The superelastic stress-strain response of [100] Co 49 Ni 21 Ga 30 single crystals in tension showing how thermo-mechanical history and microstructure.

Electronic structure and mechanism for martensitic transformation in in Co 2 NiGa Shape Memory Alloys. Computational and Experimental Design of Novel CoNiGa.

Practical Considerations In Determining Material Properties

Characterization, applications

Polymer Synthesis CHEM 421 Polymer Parameters Chemical structure –Chemical composition and distribution –Sequence length and distribution Molecular weight.

Structure development and mechanical performance of oriented isotactic polypropylene 15th International Conference on DYFP 1-5 April 2012, Rolduc Abbey,

Dynamics of Localized Photoexcitations in Condensed Matter Systems Susan L. Dexheimer, Washington State University, DMR The localization of electronic.

Stilbene based alternating copolymers exhibit semi-rigid backbones due to the steric crowding of the extra phenyl group (vis-à-vis styrene copolymers)

Viscosity of PMMA on Silicon: Evidence of Simultaneous Influences of the Free Surface and Substrate Interface Ophelia Tsui, Trustees of Boston University,

Broader Impact: Education The PI’s group has just completed its second year at OSU following the move from NCSU. The grant has provided support for a postdoctoral.

Solid State Properties Chapter 4. Amorphous Glassy Semi-Crystalline Elastomeric Polyisoprene T g = -73 °C Polybutadiene, T g = -85 °C Polychloroprene,

Equilibrium Pathway of Polymer Nanometer Films Equilibrium Pathway of Polymer Nanometer Films Ophelia K. C. Tsui, Trustees of Boston University, DMR

National Science Foundation Dynamic Phenomena in Complex Oxides for Electrochemical Energy Storage Ying S. Meng, University of California-San Diego, DMR.

Polymer Dynamic.

Molecular dynamic simulation of thermodynamic and mechanical properties and behavior of materials when dynamic loading V.V. Dremov, A.V. Karavaev, F.A.

Relations between Structure, Phase Formation and Phase Transitions in Supercooled Metallic Liquids and Glasses Kenneth F. Kelton, Washington University,

“Bottom-Up” Design of Nanostructured Conducting Polymer Thin Films Evgueni E. Nesterov, Louisiana State University & Agricultural and Mechanical College,

Plastics Testing: Techniques & Instruments for the Processor Dr Bob Jones Department of Mechanical Engineering University of Texas – Pan American.

For polymer films that are prone to rupture, it has been long observed that by increasing the molecular weight (Mw) of the polymer much above ~100 kg/mol.

EAGER: Chemical Design for Controlling Electronic Properties of Organic Semiconductors and Molecules via Edge-On Gating Luping Yu, University of Chicago,

Influence of Solvent Quality on the Relaxation Time of Polymer Films Ophelia K. C. Tsui, Boston University, DMR Spin-coating is a commonly used.

Nanoscale Self-Organization of Metallic Alloys under Ion Irradiation Robert Averback and Pascal Bellon, University of Illinois, MET DMR Award#

The QCM: Mass uptake measurement issues G. B. McKenna, Texas Tech University Mass uptake in glassy films subjected to vapor (H 2 O or CO 2 ) can be measured.

Thrust 1 One thrust of our research is focused on the use of free radical alternating copolymerization to prepare families of precisely charged copolymers.

Dynamics of Glass-forming Materials Gregory B. McKenna, Texas Tech University, DMR Structural Recovery after CO 2 - jumps We have previously shown.

Chain Dynamics and Layering within Polyelectrolyte Multilayer Films Svetlana A. Sukhishvili, Stevens Institute of Technology, DMR Understanding.

We have advanced the methodologies that are available to access well-defined functional polymers by simple and versatile routes that involve the selective.

Developing Nanostructured Inorganic-Organic Hybrid Semiconductors for Optoelectronic Applications Jing Li, Rutgers University New Brunswick, DMR

National Science Foundation GOALI: Epitaxial Growth of Perovskite Films and Heterostructures by Atomic Layer Deposition and Molecular Beam Epitaxy John.

Correlating Anomalous Viscosity of Polymer Films and Their Interfacial Dynamics by the Two-layer Model Ophelia Tsui, Trustees of Boston University, DMR.

The research aims to establish the conceptual and phenomenological foundation for the science of polymer dynamics under large deformation. Progress has.

Mesoscopic simulations of entangled polymers, blends, copolymers, and branched structures F. Greco, G. Ianniruberto, and G. Marrucci Naples, ITALY Y. Masubuchi.

Are Polymeric liquids fragile solids? SGER: Re-examining the basic description of polymer entanglement in flow Shi-Qing Wang, University of Akron, DMR.

Modifying Properties of Polymer Films by Solvent Swelling Ophelia Tsui, Trustees of Boston University, DMR Solvated film Polymer film Swell with.

Dynamics and Surface Layer Mobility of Polymer Films Dynamics and Surface Layer Mobility of Polymer Films Ophelia K. C. Tsui, Boston University, DMR

Search for Electron-Deficient Semiconducting Polymers to Rival Fullerenes Luping Yu, University of Chicago, DMR This project is aimed at developing.

1 Fracture Mechanics of Polymers B&R Ch , Fried 4.4 Testing methods of mechanical properties Static Transient Impact Cyclical.

From Local Moment to Mixed-Valence Regime in Ce 1−x Yb x CoIn 5 alloys Carmen Almasan, Kent State University, DMR Ce 1−x Yb x CoIn 5 alloys have.

Viscoelasticity of Entangled Rings

Accomplishments in the second year: Developed a phase field theory of photopolymerization induced crystallization in a blend of crystalline polymer and.

Structural Determination of Solid SiH 4 at High Pressure Russell J. Hemley (Carnegie Institution of Washington) DMR The hydrogen-rich solids are.

Modern Materials BLB Chapter 12.

One-pot Synthesis of Dumbbell Polymers through Chain Walking Polymerization Zhibin Guan, University of California - Irvine DMR Figure 1. AFM images.

Deeper issues in strain hardening Shi-Qing Wang, University of Akron, DMR The aim of the project is to delineate the difference in polymer chain.

When a new material is created through the combination of several components all properties are affected, not just the ones of particular interest. The.

Studies on Polymer Glasses, Melts, and Solutions Jane E. G. Lipson, Dartmouth College, DMR A polymeric sample in the bulk is characterized, in.

Bulk Hybridization Gap and Surface Conduction in the Kondo Insulator SmB 6 Richard L. Greene, University of Maryland College Park, DMR Recently,

Theoretical Solid State Physics Marvin L. Cohen and Steven G. Louie, University of California at Berkeley, DMR Carbon nanotubes possess novel properties.

Broader Impact: Education The PI’s group moved from NCSU to OSU as this renewal was just beginning. Dr. Marcin Wachowicz began as a postdoctoral fellow.

Origin of strain hardening in melt extension Shi-Qing Wang, University of Akron, DMR Polymer melts with long chain branching show “strain hardening”

1 Dynamic Mechanical Analysis B&R Ch , Fried 5.

Strain Rate Effects on Interstitial Diffusion Controlled Twinning in Alpha- Titanium Sreeramamurthy Ankem, University of Maryland,

Viscoelasticity.

Date of download: 5/30/2016 Copyright © ASME. All rights reserved. The Rate (Time)-Dependent Mechanical Behavior of the PMR-15 Thermoset Polymer at Temperatures.

Objectives of Chapter 15 Chapter 15. Polymers

Complex Arborescent Copolymer Architectures by Self-assembly Aklilu Worku Mario Gauthier 04 May 2016.

Dynamic mechanical analysis

Polymers: what they are and how they work?

IRG-2: Glass Transition of Irreversibly Adsorbed Nanolayers (DMR ) Rodney Priestley, Richard Register, Princeton University Thin polymer films.

Intellectual Merit: Long correlation length for glassy dynamics

Solid Rheology of Glassy Substances: Polymer and Colloidal Systems Gregory B. McKenna Texas Tech University Lubbock, TX USA Dynamics of colloidal.

The Role of Network Architecture in Collagen Mechanics

Presentation transcript:

Polymer Chain Length and Branching Effects on the Viscoelastic Bulk Modulus and Structural Recovery at High Pressure Sindee L. Simon, Texas Tech University, DMR The principal aim of this project is to measure the time-dependent bulk modulus as a function of polymeric architecture in polymers. We have recently examined two polycyanurate samples of differing crosslink density. Results from the polycyanurate with 10 mol% monofunctional monomer are shown. Crosslink density was found to have no impact on the breadth of the bulk dispersion for the system studied, rather the bulk response simply shifts to longer times as T g increases. The results are important, for example, for modeling residual stress development in thermosetting composites used in aerospace applications. Comparison of the bulk and shear retardation spectra for the polycyanurate systems indicates that the two responses arise from similar molecular mechanisms at short times but that long time chain mechanisms available to the shear response are not available to the bulk response. This corroborates our previous results on polysytrene. We are continuing our studies by examining the effect of branching using star polystyrene polymers. Pressure relaxation response for a polycyanurate containing 10 % monofuntional monomer measured at temperatures from 136 to 180 °C. On the left, the raw data are shown after application of small vertical shifts; on the right is the time-temperature superposed curve.

Education: Two graduate students, Fatema Begum and Jiaxi Guo, both finishing their second year, are being supported by the grant. The students are measuring the volumetric response after pressure and temperature jumps using pressurizable and conventional dilatometry, respectively. Two additional students supported by the grant, Prashanth Badrinarayanan and Yan Meng, successfully defended their dissertations in 2007; Prashanth is working as postdoctoral researchers at another institution, wheresa Yan has begun an academic position in China. Four refereed journal articles have been published to date, with a fifth accepted for publication. 1-5 Outreach and Broader Impact: In addition to publications, outreach has included presentations by the PI and the graduate students at various local, national, and international meetings. Broader impacts include the hosting of a young female professor supported by a Danish L'Oreal Women in Science grant in our laboratory, as well as an upgrade of the conventional dilatometer with an optical system for measuring volume changes. Jiaxi Guo in the laboratory with the pressurizable dilatometer. 1.J. Guo and S. L. Simon, J. Polym. Sci.: Part B: Polym. Phys., accepted for publication. 2.Y. Meng, P. Bernazzani, P. O'Connell, G. B. McKenna, and S. L. Simon, Rev. Scientific Instr., 80, (2009). 3.P. Badrinarayanan, W. Zheng, and S. L. Simon, Thermochimica Acta, 468, (2008). 4.Y. Meng and S. L. Simon, J. Polym. Sci.: Part B: Polym. Phys., 45, (2007). 5.P. Badrinarayana, W. Zheng, Q. X. Li, and S. L. Simon, J. Non-Cryst. Solids, 353, (2007). Sindee L. Simon, Texas Tech University, DMR