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Does anybody know of a (preferably UK based) source of poly(styrene sulphonic acid)? I only need gram quantities of it. TIA Simon -- Dr Simon Martin s.martin@sheffield.ac.uk Dept of Physics Univ. of Sheffield Sheffield S3 7RH UKReturn to Top
Dear Sirs/Madames: For our research purposes and for further use in the case of success we are looking for a special material which reversible change its dimension under local ("point") laser or electro heating. It may be a thin film which change its thickness, a threads which change its lenght, etc. Truly yours Oleg Koudrin koudrin@glas.apc.orReturn to Top
Hi, Maybe it is not even close to your application, but I have some experience with binding Vis and fluorescent dyes into micron-scale patterns using advanced photolithographical resists. Dyes penetrate only INTO THE BULK of exposed areas. I can provide details upon e-mail. -- Alex Vekselman BGM1@musicb.mcgill.ca 514-738-5378Return to Top
Does anyone know might manufacture glyceryl polymethacrylate polymer?Return to Top
Dear colleagues, What is "chemistry of polymers"? Isn't it about any phenomenon involving 1,2 or 3 moieties from a polymer or a low MM additive? What is "physico-chemistry of polymers"? Isn't it about any phenomenon involving a collective play of many polymeric units like wettability, solubility, penetrability, etc.? What is "physics of polymers"? Isn't it about any phenomenon involving ALL molecules, like refractive index, conductivity, etc? Where is "material science [of polymers]" in such scheme? Thanks, -- Alex Vekselman BGM1@musicb.mcgill.caReturn to Top
What would be the "industry" practice for validating a mold for production of a componet of a medical device ?Return to Top
Hello, I am looking for some information on the cyanoacrylates (superglues). I am doing a research project for my high school chemistry project mainly on superglues..and I am trying to understand why the ester methyl methacrylate is such a strong bonding glue? can anyone help me with regards to the molecular properties of these glues? thanks very much, steve sjones3@freenet.npiec.on.ca -------------------==== Posted via Deja News ====----------------------- http://www.dejanews.com/ Search, Read, Post to UsenetReturn to Top
I'd like some ideas of how to incorporate a unit on polymers into my middle school science curriculum. I'd especially be interested into how to incorporate this into Earth Science or Life Science. -- This message is sent via Knoxville Middle School. Please contact the school through our email to report any inappropriate use that may occur.Return to Top
Seeking job in polymer industry: Production, Research & Development, Quality Assurance, Product Development. Interested party may c= ontact me by any of the following means. Willing to relocate and available immediately. Polymer Processing (extrusion of fibers, tapes, films, molding, etc.) Specialty fibers for applications in composites, geotextiles, non-wovens, industrial applications, electronics, etc. Processing, structure property inter-relationships, mechanical properties, viscoelasticity, etc. Design and validation of equipment for polymer processing. Home Address: Office address: #1, 134 Cochran Rd. Research Associate/Assistant Professor Clemson SC 29631, USA School of Textiles, Fiber & Polymer Science Ph./Fax: (864) 654-3764 264 Sirrine Hall, Clemson SC 29634 -1307, USA Ph:(off) (864) 656-7537 Fax: (864) 656-5973 E-mail: bbhuvan@mail.clemson.edu URL : http://hubcap.clemson.edu/~bbhuvan SKILLS & EXPERIENCE Research and practical experience Production of fibers (by High speed melt spinning of fibers), micro-denier fibers, tapes, films, biaxially oriented films, non-woven= s, etc. High Speed melt spinning of PET, N6, N66, N11, Polypropylene, Blends, etc. Carpet yarns with improved resilence. Creep-resistant Polypropylene yarns for applications in geotextiles, composites, carpets. Low pill, easy dyeable, high speed texturisable Polyester. Improvement of mechanical properties of PET (130 gpd, etc.) Radially-differentiated structure of PET and its influence on Torsional fatigue properties. Polypropylene with electret characteristics for applications in filtration, etc. Hollow Fibers from Poly(vinylidene Fluoride) Bio-degradable Fibers from PolyCaprolactone Processing of polymers and inter-relationships with structure and properties Process simulation tools for processing of polymers. Mechanical properties of polymers (viscoelasticity, etc.). Rheology of polymers in shear flow and in extensional flow. Production of composites reinforced with short-fibers, 3-dimensional textile fabrics, etc. and their directional properties. Investigation of processing conditions to develop unique morphological structures in polymers. Design of machinery for polymer processing (Eg. metering pumps, quench chambers, etc.) Offered consultancy services to industrial clients: Trained personnel from industry and academic organisations. Administrative : Handled various administrative responsibilities including overseeing of computerisation -of administrative activiti= es. Computer Proficiency: Extensive computer programming skills (C, Fortran, UNIX, Dos, etc.). Interactive softwares developed for comp= uter simulation of melt spinning of polymers. Some of these softwares are currently being used by industry. EDUCATION Ph.D. in Fiber Science & Technology, Indian Institute of Technology, New Delhi, India (July 1995). Research topic for doctoral degree: Some studies on inter-relationships between processing, structure and properties in isotactic po= lypropylene fibers. Master of Technology in Fiber Science & Technology, Indian Institute of Technology, New Delhi, India. C.G.P.A. = 8.9 (December 89). Bachelor of Engineering in Textile Engineering from Gulbarga University, Gulbarga, India. (February 1988 with 78.5% with distincti= on and with first rank. AWARDS RECEIVED : Ranganatha Memorial Gold medal for First Rank Holder in Final year B.E. (1987). Precitex award for Best Student in Spinning (1987). Topped the All India "Graduate Aptitute Test for Engineers" (GATE) (1988). Recepient of GATE scholarship for completion of Master of= Technology degree in Fiber Science & Technology. WORK EXPERIENCE [1] Research Associate/Assistant Professor (Post-doctoral position) at School of Textiles, Fiber & Polymer Science s= ince November 1995. [2] Senior Scientific Officer at Indian Institute of Technology, Delhi. June 1990 to Oct. 1995. Commisioning, running, maintenance and research activities on Fourne High Speed Melt Spinning Plant (SST 1207) along with a host of= related utilities. Production of various deniers of HDPE, PP, PPCP, N6, N66, N11, PET, etc. at various spinning speeds upto 4000 m/= min. PUBLICATIONS Y.C.Bhuvanesh and V.B.Gupta, "Long-term prediction of creep in textile fibers', Polymer Communications, Vol. 35, No. 10, p2226 (199= 4). Y.C.Bhuvanesh and V.B.Gupta, "Computer simulation of melt spinning of poly(ethylene terephthalate using a steady-state model", Indi= an Journal of Fiber and Textile research, Vol.15, p145, Dec. (1990). Rajkumar Verma, Y.C.Bhuvanesh, V.B.Gupta, T.Manabe and Rajesh Jalan, "Some studies on melt flow behaviour of poly(ethylene terephtha= late)" in Special issue on Recent Advances in Man-made fibers, Indian Journal of Fiber and Textile Research, Vol.16, p39, Mar. (1991= ). Y.C.Bhuvanesh and V.B.Gupta, "Interaction between viscoelastic and structural relaxation in drawn polypropylene yarn", Polymer, Vol= 36, p3669 (1995) Y.C.Bhuvanesh and V.B.Gupta, "Computer simulation of melt spinning of polypropylene fibers using a steady-state model", J. of Appl.= Polym. Sci. Vol. 58, No. p663 (1995). Y.C.Bhuvanesh and V.B.Gupta, "Processibility and properties of polypropylene containing small amounts of polystyrene", J. of Appl. = Polym. Sci., Vol 60, p1951 (1996). V.B.Gupta and Y.C.Bhuvanesh, "Studies on Shrinkage characteristics of yarns made from Polypropylene and Polypropylene containing 5 p= ercent by weight of Polystyrene", Indian J. of Fiber & Textile Res. (in press). P.Bajaj, Y.C.Bhuvanesh and A.Bhargava, "Effect of Diffussional rate on the structure and properties of wet spun Acrylonitrile terpol= ymer protofibers", under preparation for J. of Appl. Polym. Sci. S.A.Mondal, V.B.Gupta and Y.C.Bhuvanesh, "Relationship between spinning speed and throughput rate during Melt Spinning of some fiber= forming polymers", communicated to J. of Appl. Polym. Sci. Y.C.Bhuvanesh and V.B.Gupta, "Long-term creep behaviour of drawn polypropylene yarn and polypropylene-polystyrene blends", under pre= paration for J. of Appl Polym Sci. BOOKS Contributed to a book entitled "Production, structure and properties of Man-made Fibers", in press, Chapman & Hall, London.Return to Top
Whether a transition is easy to find or not- it depends upon the formulation. Most epoxies have Tg transitions that are very easy to find by DSC or TMA. It all depends upon whether the resin matrix cross-links to about the same degree of cross linking. If the degree of crosslinking varies throughout the matrix, then it is hard to find an 'average' Tg, so it will be difficult to find. However, if the system is formulated to provide a consistent degree of crosslink throughout the structure, then the Tg will happen simultaneously and be easier to measure analytically.Return to Top
I think they mean Mn, which is a proper "average" in the usual use of the word.Return to Top
In article <58267b$snn@cronkite.d48.lilly.com>, Bill MorrisonReturn to Topwrites: >What would be the "industry" practice for validating a mold for production of >a >componet of a medical device ? One way is to take sample parts off the press and have them laser digitized, creating 10's of thousands of points in 3D space. From there, there is software which can compare the points against the original CAD model data with deviation color plots created. If interested, I represent a company that provides this service. -------------------------------------------------------------------------- -------------- EEEEEEEEEEEE EXCELERATION, Incorporated EEEEEEEEEEEE Mike Roberts - President EEEEEE 4771 South 99th Street EEEEEEEEEEEE Milwaukee, WI 53228 EEEEEEEEEEEE PH: 414.427.8139 EEEEEE FX: 414.427.0092 EEEEEEEEEEEE Email: cadcammike@aol.com EEEEEEEEEEEE Manufacturers Representatives of High-Technology Companies -------------------------------------------------------------------------- -----------------
Polyimide's excellent temperature and radiation resistance make it an excellent material for aircraft structure, aerospace components, etc.Return to Top
In article <329DE4A3.50E9@flory.mit.edu> Peter MottReturn to Topwrites: >> I am using compact-tension method to measure K1c data, which is the >> index of toughness. According some books, I should get several K1c data >> from one specimen with the same K1c value. but my results have very high >> deviation ( 20%-50%). I don't know why. >> >> by the way, Can any people tell me where to find touchness data (K1c, >> G1c) of some polymers > >The experimental scatter in any fracture measurement is typically >quite large. The variations for brittle materials is often several >orders of magnitude; for metals, I would guess that factors of two >or three are typical. If your error is only 20%-50%, I would be very >happy with that and call it a day. >For a crosslinked material, such as epoxy, the ability to reproduce the >modulus to within 5-10% is very good. Fracture is considerably more >sensitive to variations in processing than the modulus. >Experimental data: start with IM Ward, "Intro to Mechanical Proper. >of Solid Polymers", and check out the references. Or, try "the >Encyclopedia of Polymers." >Peter Mott We use a singleedge notch fracture toughness test on dental composite filling materials. They are a combination of Bis-GMA/TEGDMA polymer resin and fine glass filler particles (50-80 wt%). The K1c values range from 1.0-2.0 MPa*m^0.5. Typically our scatter is from 5 to 15%. the compact tension is a harder test to control. We had alot of trouble trying to use it. The only advantage is that it requires much less material. The test that produces multiple results from a single specimen is the double torsion test. Its especially difficult to control. The S.E.N. is the best way to go. John Condon School of Dentistry Oregon Health Sciences Univ.
Hello everybody, I am interested in experimental stress-strain curves for neat epoxy resin subjected to extensional or shear loadings. Does anyone know from where I could obtain this? Thanks in advance, Manohar Kollegal kgm1@cec.wustl.eduReturn to Top
I am a consultant with significant experience in latex compounding, if interested e-mail VMDEEB@Ma.ultranet.com for more detailesReturn to Top
I am a consultant with significant experience in latex compounding, if interested e-mail VMDEEB@Ma.ultranet.com for more detailesReturn to Top