39 research outputs found
Method for the preparation of a thermoplastic liquid crystalline polymer
No full textThe present invention relates to a method for the preparation of a thermoplastic liquid crystalline polymers. The present invention also relates to segmented copolymers containing thiourethane, amide, or linear bismaleimide hard segments and liquid crystal soft blocks and to thermoplastic liquid crystal elastomer (LCE) actuators containing the same
Does the NCAA Exploit College Athletes? Rights of Publicity, EA Sports and the Video Game Industry
No full textSean M. Hanlon is a member of the litigation department of Holland & Hart in Denver, Colorado, with a focus on construction and real estate litigation. Prior to joining Holland & Hart, Sean was a litigation associate with GableGotwals in Tulsa, Okla. Previously, he clerked for the Honorable Sam A. Joyner of the United States District Court for the Northern District of Oklahoma. Sean is admitted to practice in both Colorado and Oklahoma. He is also admitted to practice in the United States District Courts for the District of Colorado and the Northern District of Oklahoma.
Professor Ray Yasser has served as plaintiff\u27s counsel in a number of Title IX (gender equality) sports cases, several of which were settled in 1997. He is co-author of Sports Law: Cases and Materials , a sports law casebook widely used in law schools around the country. Professor Yasser, who earned his J.D. in 1974 from Duke Law School, teaches torts, trial practice and sports law. Prior to joining the TU law faculty, he served in the North Carolina Attorney General\u27s Office
Evoking the Possibility of Presence:Textual and Ideological Effects of Linguistic Negation in Written Discourse
No full textThis thesis explores the textual and ideological effects of linguistic negation in written texts. It argues that when language users process negation, understanding its use in context is as much about the possibility of presence as it is about the actuality of absence. This gives rise to a variety of effects in texts from contributing to the construction of fictional characters to potentially influencing readers’/hearers’ view of the world they inhabit. This thesis brings together research on the theoretical aspects of how negation works to present a new approach to linguistic negation in written discourse. It also demonstrates how this approach can be applied in the analysis of the conceptual practice of negating. The approach presented is made up of three main elements; negation is presuppositional, is realised through a wide variety of linguistic forms beyond the morphosyntactic core forms (not, no, never, none, un-, in-, and so on) and includes semantic and pragmatically implied forms. These two elements combine to give rise to implied meaning in context. Having outlined this approach to negation, it is then applied in the analysis of literary and non-literary texts to explain the textual and ideological effects that arise from its use
A pH-Responsive Liquid Crystal Hydrogel Actuator with Calcium-Induced Reprogrammable Shape Fixing
Get PDFSoft polymer actuators have myriad applications and have therefore gained considerable attention in recent years. However, it remains challenging to prepare soft actuators with predefined shapes. Here, a bilayer polymer actuator with a (re)programmable shape is prepared from a microporous anisotropic polypropylene scaffold and a thin, pH-responsive liquid crystalline network (LCN) layer. The hydrogen bonds between dimerized benzoic acid derivatives in the LCN can be disrupted by an alkaline treatment, resulting in a pH-responsive LCN hydrogel layer. The pH-responsive actuation is governed by both the anisotropic mechanical properties of the scaffold and the cross-link density of the LCN hydrogel. Ca2+ ions can be used to chemically cross-link the actuator resulting in an initial programmed shape. The shape fixing can be reversed by removing the Ca2+ ions with an ethylenediaminetetraacetic acid (EDTA) solution. The shape fixing can be performed locally, resulting in pH-responsive actuators with three-dimensional initial configurations of choice
Pyranine Based Ion‐Paired Complex as a Mechanophore in Polyurethanes
No full textA new mechanophore for polyurethane thermoplastic elastomers based on ion-paired complexes is developed. 8-(2-hydroxyethoxy)pyrene-1,3,6-trisulfonate (HEPTS) is incorporated into polyurethanes as an end-capper and aggregates in apolar media. Aggregation of the ionic HEPTS end groups in solution depends on concentration solvent polarity. The addition of dimethylformamide to a tetrahydrofuran solution of the polymer results in the dissociation of the aggregates and a significant shift in fluorescence emission from yellow to blue. The same shift in fluorescence emission is induced by stretching the solid polymer at strains larger than 1 and stresses above 7.5 MPa, with a clear increase above 12.5 MPa. Strain induced dissociation of HEPTS aggregates not attached to the polymer chain leads to fluorescence changes that are much less reproducible
Direct Ink Writing of Recyclable Supramolecular Soft Actuators
Get PDF[Image: see text] Direct ink writing (DIW) of liquid crystal elastomers (LCEs) has rapidly paved its way into the field of soft actuators and other stimuli-responsive devices. However, currently used LCE systems for DIW require postprinting (photo)polymerization, thereby forming a covalent network, making the process time-consuming and the material nonrecyclable. In this work, a DIW approach is developed for printing a supramolecular poly(thio)urethane LCE to overcome these drawbacks of permanent cross-linking. The thermo-reversible nature of the supramolecular cross-links enables the interplay between melt-processable behavior required for extrusion and formation of the network to fix the alignment. After printing, the actuators demonstrated a reversible contraction of 12.7% or bending and curling motions when printed on a passive substrate. The thermoplastic ink enables recyclability, as shown by cutting and printing the actuators five times. However, the actuation performance diminishes. This work highlights the potential of supramolecular LCE inks for DIW soft circular actuators and other devices
Method for the preparation of a thermoplastic liquid crystalline polymer
No full textThe present invention relates to a method for the preparation of a thermoplastic liquid crystalline polymers. The present invention also relates to segmented copolymers containing thiourethane, amide, or linear bismaleimide hard segments and liquid crystal soft blocks and to thermoplastic liquid crystal elastomer (LCE) actuators containing the same
Thermoplastic liquid crystal elastomer soft actuators
Get PDFThis invited article is an account of a lecture on thermoplastic liquid crystal elastomers (LCEs) given at the 16th European Conference on Liquid Crystals (ECLC) in Rende, Italy. Currently most LCE actuators are permanently crosslinked thermoset. We avoid permanently crosslinked networks and instead obtain melt- and re-processable, recyclable thermoplastic LCE actuators by introducing H-bond interactions as physical crosslinks. Post-polymerisation of the LCE actuators is not required. This short proceedings article summarises the research carried out in our group on thermoplastic LCE actuators. The LCEs show both temperature and light-driven deformations and thermoplastic properties, affording sustainable soft actuators exhibiting melt-processable and recyclable functionalities compatible with large-scale industrial processing methods. It is envisioned that these polymers will serve as starting point for industrially-relevant smart materials that are applicable in our society for a myriad of applications including soft robotics, smart textiles, smart surface, artificial muscles, and deployable soft actuating devices
Method for the preparation of a thermoplastic liquid crystalline polymer
No full textThe present invention relates to a method for the preparation of a thermoplastic liquid crystalline polymers. The present invention also relates to segmented copolymers containing thiourethane, amide, or linear bismaleimide hard segments and liquid crystal soft blocks and to thermoplastic liquid crystal elastomer (LCE) actuators containing the same
Method for the preparation of a thermoplastic liquid crystalline polymer
No full textThe present invention relates to a method for the preparation of a thermoplastic liquid crystalline polymers. The present invention also relates to segmented copolymers containing thiourethane, amide, or linear bismaleimide hard segments and liquid crystal soft blocks and to thermoplastic liquid crystal elastomer (LCE) actuators containing the same
