Brian J. Love

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCoumarins in Polymers: From Light Harvesting to Photo-Cross-Linkable Tissue ScaffoldsScott R. Trenor, Allan R. Shultz, Brian J. Love, and Timothy E. LongView Author Information Polymeric Materials and Interfaces Laboratory, Department of Chemistry, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061-0344 Cite this: Chem. Rev. 2004, 104, 6, 3059–3078Publication Date (Web):May 6, 2004Publication History Received20 October 2003Published online6 May 2004Published inissue 1 June 2004https://pubs.acs.org/doi/10.1021/cr030037chttps://doi.org/10.1021/cr030037cresearch-articleACS PublicationsCopyright © 2004 American Chemical SocietyRequest reuse permissionsArticle Views11453Altmetric-Citations697LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-Alertsclose SUBJECTS:Aromatic compounds,Irradiation,Oligomers,Polymers,Reaction products Get e-Alerts

Abstract Cryogenic mechanical milling successfully converted α‐phase poly(vinylidene fluoride) (PVDF) powder into β‐phase PVDF, as measured by wide‐angle X‐ray diffraction. The presence of β‐phase PVDF became more pronounced with increased milling times over the limited time range evaluated. This was the first recorded instance of β‐phase powders forming from the α phase through milling. These β‐phase powders maintained their crystal structure during compression molding at 70 °C. © 2003 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 42: 91–97, 2004

Conventional magnetorheological (MR) fluids are suspensions of micron-sized particles in a hydraulic or silicone oil carrier fluid. Recently, research has been conducted on the advantages of using bidisperse fluids, which are mixtures of two different powder sizes in the MR suspension. The MR fluids investigated here use a mixture of conventional micron- sized particles and nanometer-sized particles. The settling rate of such bidisperse fluids using nanometer-sized particles is reduced because the nanoparticles fill pores created between the larger particles, thereby reducing fluid transport during creeping flow. This reduction in the settling rate comes at a cost of a reduction in the maximum yield stress that can be manifested by such an MR fluid at its saturation magnetization. There is a measurable and predictable variation in rheological properties as the weight percent (wt%) of the nanometer-sized particles is increased relative to the weight percent (wt%) of micron-sized particles, while maintaining a constant solids loading in the MR fluid samples. All bidisperse fluids tested in this study have a solids loading of 60 wt% of iron (Fe) particles. This study investigates the effect of increasing the wt% of 30 nm (nominal) Fe particles relative to 30 mm (nominal) Fe particles on rheological characteristics, such as yield stress and postyield viscosity. The goal of this study is to find an optimal composition of the bidisperse fluid that provides the best combination of high yield stress and low settling rate based on empirical measurements. The applicability of the Bingham-plastic rheological model to the measured flow curves of these MR fluids is also presented.