Bulletin of the American Physical Society
APS March Meeting 2014
Volume 59, Number 1
Monday–Friday, March 3–7, 2014; Denver, Colorado
Session A14: Invited Session: Industrial Applications of Olefin Block Copolymers |
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Sponsoring Units: DPOLY Chair: Brent Neal, Milliken and Company Room: 301-303 |
Monday, March 3, 2014 8:00AM - 8:36AM |
A14.00001: (Electro)Mechanical Properties of Olefinic Block Copolymers Invited Speaker: Richard Spontak Conventional styrenic triblock copolymers (SBCs) swollen with a midblock-selective oil have been previously shown to exhibit excellent electromechanical properties as dielectric elastomers. In this class of electroactive polymers, compliant electrodes applied as active areas to opposing surfaces of an elastomer attract each other, and thus compress the elastomer due to the onset of a Maxwell stress, upon application of an external electric field. This isochoric process is accompanied by an increase in lateral area, which yields the electroactuation strain (measuring beyond 300{\%} in SBC systems). Performance parameters such as the Maxwell stress, transverse strain, dielectric breakdown, energy density and electromechanical efficiency are determined directly from the applied electric field and resulting electroactuation strain. In this study, the same principle used to evaluate SBC systems is extended to olefinic block copolymers (OBCs), which can be described as randomly-coupled multiblock copolymers that consist of crystallizable polyethylene hard segments and rubbery poly(ethylene-co-octene) soft segments. Considerations governing the development of a methodology to fabricate electroresponsive OBC systems are first discussed for several OBCs differing in composition and bulk properties. Evidence of electroactuation in selectively-solvated OBC systems is presented and performance metrics measured therefrom are quantitatively compared with dielectric elastomers derived from SBC and related materials. [Preview Abstract] |
Monday, March 3, 2014 8:36AM - 9:12AM |
A14.00002: Thermoplastic Adhesives based on polyolefin and olefinic copolymers Invited Speaker: Rituparna Paul H.B. Fuller has been a leading global industrial adhesive manufacturer for over 125 years. It is a company with a rich history of consistently delivering adhesive innovations for enhancing product performance in the market place. H.B. Fuller technologies/products find application in several markets including packaging, personal hygiene and nonwovens, durable assembly and electronics. In this presentation, H. B. Fuller's technology innovation journey will be shared with emphasis on groundbreaking technologies/products based on polyolefin and olefin copolymers. [Preview Abstract] |
Monday, March 3, 2014 9:12AM - 9:48AM |
A14.00003: The versatility in morphology and physical properties offered by chain shuttled olefin block copolymers Invited Speaker: Jeffrey Weinhold Chain shuttling catalysis enables the production of olefin block copolymers (OBCs) with a wide range of block compositions. Unique morphology and property combinations can be achieved with highly crystalline hard blocks and low crystallinity or fully amorphous soft blocks. The effect of the amount of comonomer in the soft blocks on phase behavior, morphology and properties will be the focus of this presentation. In one class of materials, the soft blocks contain just enough octene comonomer to give elastic behavior but, unlike a random copolymer-based olefin elastomer, the soft segments are held together by thick crystals formed by the hard blocks. In addition to strengthening the network, these crystals provide temperature resistance and, by solidifying at higher temperature, they allow faster product fabrication. Increasing the soft block's octene content yields the next class of materials which have improved compatibility with polypropylene. This property allows the formation of fine, uniformly-dispersed OBC elastomer particles in PP. Since the impact strength of toughened PP increases as the particle size is reduced, a lower amount of elastomer is required to achieve an application's target for toughness. The direct benefit of lower elastomer loading is an increase in modulus, which enables lightweighting in applications. With further increases in the soft block's octene content, the incompatibility between the hard and soft blocks becomes large enough to cause the OBCs to form ordered melt morphologies. In the solid state, the alternating crystalline and amorphous regions have surprisingly large domain spacings and, due to the difference in refractive index between the domains, the periodicity results in a partial photonic band gap for frequencies in the visible spectrum. Comparisons to the morphology of monodisperse block copolymers and the predictions of theories will be presented. Also, the results of an extension to strong segregation theory will be shown, providing greater insight into the behavior of these polydisperse block copolymers. [Preview Abstract] |
Monday, March 3, 2014 9:48AM - 10:24AM |
A14.00004: TBD Invited Speaker: Miriam Rafailovitch . [Preview Abstract] |
Monday, March 3, 2014 10:24AM - 11:00AM |
A14.00005: Panel Discussion on Industrial Research for Graduate Students and Postdoctoral Researchers Invited Speaker: Brent Neal The session organizers invite all industrial researchers and those who might be interested in a career in industrial research for an open discussion on careers in industry. The topics covered will be flexible based on audience interest, but are expected to include career paths, resume building, networking, interviewing, and transitioning out of academia. [Preview Abstract] |
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