Time filter

Source Type

Wilmington, DE, United States

Kumpinsky E.,Ashland Inc.
Design Institute for Emergency Relief Systems (DIERS) 2015 - Topical Conference at the 2015 AIChE Spring Meeting and 11th Global Congress on Process Safety

The regressed self-heating rate of vinyl acetate polymerization runaway reaction was analyzed by means of statistical tools. The data come from a VSP2 experiment that was performed for a DIERS round-robin test. It is shown that all predictors are collinear, i.e., there is a linear dependence between the predictors, meaning that the model is inflated. Consequently, the parameters may be distorted, many of which do not make physical sense. It is shown how to reduce collinearity to a manageable level and how to perform reparametrization to lessen interdependency between the parameters. The outcome is the shortest and less correlated form of the self-heating rate equation, which can be used for process-safety evaluations. © 2015, Ashland Inc. Source

Gitsov I.,New York University | Berlinova I.V.,Bulgarian Academy of Science | Vladimirov N.G.,Ashland Inc.
Journal of Polymer Science, Part A: Polymer Chemistry

The amphiphilic linear-dendritic copolymers self-assemble in selective solvents adhere to the surface of synthetic and natural polymers, and could be used as encapsulating agents or nanoscale reaction vessels. The interesting properties of these materials and their potential applications are the driving forces behind the continuing search for novel amphiphilic linear-dendritic hybrids. The primary focus of the study is the exploration of the regioselective accessibility of the alcoholate groups in hexahydroxy-PSt multifunctional precursor for efficient coupling with reactive dendrons of different chemical composition and the initiating efficiency of activated hexahydroxy-PSt in the anionic ring-opening polymerization of ethylene oxide (EO). Attempts to react the terminal hydroxyl groups with secondgeneration dendrons do not lead to complete functionalization due probably to the increasing steric congestion. Source

Mahoney J.M.,Ashland Inc.
Paper Conference and Trade Show, PaperCon 2014

A proprietary, new creping adhesive capable of providing sheet control under high temperature and low moisture conditions has been developed and is now available. The experimental design utilized a structure-activity-relationship study to develop a three-dimensional creping adhesive that is formed by covalently linking a proprietary copolymer and a polyamidoamine. Experimental parameters were varied to determine which structure provided the best combination of performance features. Creping adhesive performance was evaluated using the Adhesion/Release Test (ART), film persistence and film rewetability. This new, patented technology provides significantly improved adhesion to dry sheets relative to both standard thermosetting and non-thermosetting PAE creping adhesives. In addition, improved film persistence and rewetability have been demonstrated. Field evaluations confirmed the laboratory performance: Customers are able to produce softer sheets while maintaining good Yankee control even at reduced adhesive add-on rates. Source

Bedarkar A.,North Dakota State University | Wu X.-F.,North Dakota State University | Vaynberg A.,Ashland Inc.
Applied Surface Science

Droplet wetting on two parallel filaments may assume a barrel-shaped morphology or a liquid bridge depending upon the filament diameter and spacing, droplet volume, and contact angle. This paper is aimed to examine the dependency of droplet wetting length upon the above parameters. In the process, morphology of either a barrel-shaped droplet or a liquid bridge sitting on two parallel filaments is determined numerically by using surface finite element method (SFEM). Variation of wetting length with contact angle is examined at varying droplet volume, filament spacing, and droplet morphology. It is found that the droplet wetting length increases with decreasing filament spacing ratio as well as contact angle while it also increases with the growth of droplet volume. The dependency of wetting length upon contact angle behaves sensitive to filament spacing in the case of stable liquid bridges, while it exhibits nearly constant sensitivity to the contact angle in the case of barrel-shaped droplets. The quantitative relations yielded in this study can be considered as characteristic curves applicable for a variety of droplet-on-filament systems, particularly useful to wetting property characterization of filaments, micro liquid delivery, biological cell manipulation, etc. © 2010 Elsevier B.V. Source

Vaynberg K.A.,Ashland Inc.
Waterborne Symposium: Proceedings of the 41st Annual International Waterborne, High-Solids, and Powder Coatings Symposium

Paint Application Feel refers to the sensorial outcome of paint roll out by an experienced evaluator. The outcome of such evaluation is by nature subjective, imprecise and open to interpretation. Despite the obvious shortcomings, the paint 'feel' is critical to rheology modifier development, paint formulation in general, performance qualification and ultimately to the end user satisfaction. Researchers at Ashland Inc. have developed the Application Reader Technology (ART), a technology capable of measuring paint roll out application properties that lay at the core of subjective Paint Application Feel. This device is designed to provide accurate and reproducible results, enabling the development of a standardized test method for Paint Application Feel. This paper presents the workings of ART and, for the first time, offers the opportunity to begin understanding the complex physics behind sensorial performance of coatings. Source

Discover hidden collaborations