Novel Green Polymer Composites: Major Enhancements in the Crystallization Kinetics of Poly(lactic acid) and Mechanical Properties of Polypropylene Created via Solid-State Shear Pulverization Philip J. Brunner1,3, John M. Torkelson1-3 and Neil Kane3 1Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208-3120
A method for improving the throughput of solid-state shear pulverization and solid-state melt-extrusion devices may include the addition of a heat absorbing material ... The liquefication temperature may be a melting point of a semi-crystalline polymer or a glass transition temperature of an amorphous polymer. Inventors: Brunner ...
ABSTRACT The selective laser sintering (SLS) is one of the most important 3D‐printing technologies. However, the challenges in SLS could be in the limited high material cost and single material performance. Development of high‐performance and multifunctional copowders suitable for SLS is of great importance.
by solid-state shear pulverization: e ff ects of signi fi cantly exfoliated, unmodi fi ed graphite content on physical, mechanical and electrical properties.
Method of producing an exfoliated polymer-clay nanocomposite through solid-state shear pulverization: : Torkelson et al. 20030230824: Processes of mixing, compatibilizing, and/or recycling blends of polymer materials through solid state shear pulverization, and products by such processes: : Furgiuele et al. 6180685
Dispersion and Major Property Enhancements in Polymer/Multiwall Carbon Nanotube Nanocomposites via Solid-State Shear Pulverization Followed by Melt Mixing. Macromolecules 2008, 41 (16), 5974-5977. DOI: 10.1021/ma801321j.
Abstract Solid-State Shear Pulverization (S3P) is a new polymer processing technology capable of efficient mixing blends with different component viscosities (which are unprocessable by conventional melt extrusion due to the phase separation). S3P sub ects polymers to compression and shear, resulting in fracture into a powder of various particle size and particle size distribution.
Free Online Library: Residence Time Distribution and Specific Mechanical Energy in Solid-State Shear Pulverization: Processing-Structure-Property Relationships in a Chilled Extruder.(Report) by "Polymer Engineering and Science"; Engineering and manufacturing Science and technology, general Extruding Methods Extrusion process Polymerization Polymers Mechanical properties Production processes
solid-state shear pulverization (sssp) is an innovative, continuous, environmentally benign, and industrially scalable process used to make materials that cannot be made via conventional processing techniques, reduce material cost by eliminating processing steps, and/or produce materials with superior properties as a result of better break-up and …
To address some critical issues facing Li metal batteries, the authors design cross-linked polymer networks to serve as either Li metal anode coatings or all solid-state electrolytes. Their ...
Additionally, PLA is shear-sensitive in the melt state, suffering from molecular, viscosity, and physical property degradation compared to petroleum-based analogs [ 2 ]. Incorporating other polymers, such as polyethylene into a blend with PLA overcomes these challenges, but significantly lessens the sustainable nature of the output [ 23 ].
Solid-state shear pulverization, as can be used to disperse a pro-oxidant component in a polymer component and affect subsequent polymer biodegradation. Description The annual world production of plastics, which was around 0.5 million tons in 1950, surpassed 230 million tons in 2009.
We claim: 1. A method of affecting crystallization kinetics of a semi-crystalline homopolymer, said method comprising: providing a solid semi-crystalline homopolymer component, said homopolymer a single homopolymer comprising less than about 50% crystallinity; and applying a mechanical energy to said single homopolymer through solid-state shear pulverization in the presence of cooling at least ...
Challenges associated with such reactions include the possible cyclization of dienes [13], the need to use carefully selected isospecific catalysts [14], and the need for additional synthesis and/or purification steps [9], [10].
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Here we employ solid-state shear pulverization (SSSP) to produce polymer-graphite nanocomposites that are not subject to the thermodynamic/kinetic limitations associated with con-ventional processes. With SSSP, a modified twin-screw extruder applies shear and compressive forces to solid-state materials;
It is apparent that with increasing shear rate, the α-relaxation is suppressed, the α-relaxation time decreases, and, eventually, the α- and fast β-relaxations merge for high shear rates, similarly to the effect achieved by increasing T. Similar results have been observed before in two-dimensional (2D) ( 6) and 3D ( 7) model atomic liquids.
persing it in the polymer matrix effectively, and reducing the use of organic solvents remain a major challenge in achieving green industrial preparation. When the matrix material is a non-polar ...
Chemotherapy is almost exclusively administered via the intravenous route, which results in severe limitations. Therefore, the development of effective and less expensive chemotherapy that improves patients' quality of life could be a game changer in medical oncology. While subcutaneous (SC) administration has the potential to meet these criteria, it is extremely restrictive as it cannot be ...
High-performance polymer electrolytes are highly sought after in the development of solid-state batteries. Lynden Archer and co-workers report an in situ polymerization of liquid electrolytes in a ...
Potential application of solid-state shear pulverization The SSSP is a continuous process, unlike the other mechanochemical system such as milling, pan milling, and cryogenic milling. This makes it easily scalable and hence industrially applicable, like the traditional TSE processes [41].
"Overcoming Sustainability and Energy Challenges in Polymer Science via Solid-State Shear Pulverization" Christopher Evans - Chemical Engineering "Role of Fragility and Neighboring Domains on the Tg and Surface Wave Dynamics of Nanoconfined Polymers" Stephen Marrou - Chemical Engineering
Shear dependent slippage at a polymer solid interface . Effect of wall slip on the shear flow of a polymer in a channel with a wavy bottom Polymer Science Series A 2009 51 8 929 DOI 10 1134 S0965545X09080124 Patrick
Reducing the size of the solid material specially polymeric material is an important process in industry. Using small particle size provides a homogeneous feed, near fluid-like handling characteristic, a desired temperature distribution among material during processing or molding, enhanced effective surface area and good mixing. In order to obtain polymer powders basically there are three ...
Search results for: Solid State Shear Pulverization. Solid-State Shear Pulverization.
Overcoming sustainability and energy challenges in polymer science via solid-state shear pulverization
It is proposed that SSSE causes this self-compatibilization of blends by rupturing polymer chains and allowing them to recombine with their neighboring chains. When this recombination involves dissimilar chains at an interface between powder particles, block copolymers are formed, and if the chain transfer reactions are possible, graft ...
Preparing large-size polymer single crystals remains a challenge in polymer science (6-8). Topochemical polymerization, a process whereby the confinement and preorganization of the solid state forces a chemical reaction to proceed with a minimum amount of atomic and molecular movement, has provided a promising solution (9, 10).
Corpus ID: 138553583; Overcoming sustainability and energy challenges in polymer science via solid-state shear pulverization @inproceedings{Brunner2013OvercomingSA, title={Overcoming sustainability and energy challenges in polymer science via solid-state shear pulverization}, author={Philipp Brunner}, year={2013} }
Interpolymer radical coupling reaction leading to block copolymer formation has been demonstrated for the first time in the solid state and in the absence of diffusion using solid-state shear pulverization. Radical coupling is often referred to as a diffusion-controlled reaction as it lacks an activation barrier to reaction.
Well-exfoliated polymer-graphite nanocomposites made using only untreated, as-received graphite and polymer were prepared by solid-state shear pulverization (SSSP). X-ray diffraction of 2.5 wt% graphite-polypropylene (PP) nanocomposites made via SSSP revealed an almost total suppression of the scattering peak characteristic of the inter ...
An important challenge is modeling the viscoelasticity of the microcapsule's polymeric shell or of an underlying polymeric surface. One means of addressing this issue is to introduce a dissipative unit between the springs that connect the lattice sites.
Novel Materials Made by Solid-State Shear Pulverization. Solid-state shear pulverization (SSSP) is a novel mechanical process that uses a modified twin-screw extruder with cooling zones to maintain the polymer in the solid state during processing. High shear and compressive forces result in repeated fragmentation and fusion of polymer in the ...
Overcoming sustainability and energy challenges in polymer science via solid-state shear pulverization Brunner, Philip . Northwestern University ProQuest Dissertations Publishing, 2013. 3563697.
1 Introduction. Commercial lithium (Li)-ion batteries have achieved considerable success in the last few decades, [1-8] but difficult to meet the growing demand for energy density. [9, 10] Lithium metal batteries (LMBs) are considered as promising next-generation energy storage systems due to their unparalleled specific capacity (3860 mAh g −1) and the lowest electrochemical potential (−3. ...
