Effect of molecular weight on crystallization and melting of...

Polymer Engineering and Science;  October 1, 2001 ;     700+ words ......trimethylene terephthalate) as a function of molecular weight was investigated under isothermal...bulk crystallization increased with molecular weight. An Avrami analysis of the isothermal...constant increased with increasing molecular weight. The Avrami exponent, n, approached...

Immobilized...

Polymer Engineering and Science;  February 1, 2007 ;     700+ words ......bimodal resin typically refers to a molecular weight distribution having two peaks at different...consists of two main fractions: a low molecular weight fraction affords a material with good...processibility and high rigidity, while a high molecular weight fraction brings a good ...

Polymer with right molecular weight and distribution.

New Materials Japan;  June 1, 2001 ;     275 words ......polymer, which has a sufficiently high molecular weight to be used as an adhesive agent. Previously...from this process has the problems of low molecular weight and wide molecular weight distribution. This has led to problems...

Select the right hydrocarbon molecular weight correlation

Chemical Engineering Progress;  December 1, 1998 ;     700+ words ......fractions experimentally, molecular weight is one physical characteristic...equations produce a wide range of molecular weight estimates for heavy hydrocarbon...fractions. This article examines molecular weight distribution predictions...

Israeli Inventors Develop Molecular Weight Determination Process

US Fed News Service, Including US State News;  January 19, 2007 ;     304 words ......developed processes for determining the molecular weight of glatiramer acetate and other copolymers...invention further provides a plurality of molecular weight markers for determining the molecular weight of glatiramer acetate and other copolypmers...

Determination of [beta]-glucan molecular weight using SEC with calcofluor...

Cereal Chemistry;  July 1, 2003 ;     700+ words ......glucan for determination of amount and molecular weight of [beta]-glucan in different cereal...glucan was fractionated into narrow molecular weight ranges and the average molecular weight was determined before analysis on the...

Ultrafiltered perfluoropolyether lubricant under molecular weight...

Tribology Transactions;  October 1, 2000 ;     700+ words ......lubricity have a close relation to the molecular weight distribution. The commercial Perfluoropolyether...lubricant for magnetic disks, has a wide molecular weight distribution from several hundred...lubricity, it is necessary to control the molecular weight distribution. This paper ...

Microencapsulation using polyactic acid. III. Effect of polymer molecular...

Biomedical Materials;  May 1, 1990 ;     132 words ......core. Three polymers of different molecular weight were used to prepare different core...increased with increase in polymer molecular weight. Microcapsule size was also found...in core loading with the two high molecular weight polymers, whilst the low molecular...

High Molecular Weight Poly(ethylene oxide)-Based Drug Delivery Systems:...

Pharmaceutical Technology;  May 1, 2005 ;     700+ words ...Polyethylene oxide resins are non-ionic, high molecular weight, water-soluble polymers with good...200 to 7 10^sup 6^. Products with a molecular weight less than -25,000 are viscous liquids...from one another depending on their molecular weight. all these grades find official status...

Shear field induced diffusion and molecular weight fractionation during...

Polymer Engineering and Science;  July 1, 2004 ;     700+ words ......the elastic strain energy for high molecular weight, viscoelastic polymers. It has been...gradient field to separate polymers by molecular weight (1). Furthermore, work by Lo and coworkers...unable to see any signs of radial molecular weight fractionation in polydisperse ...

BIODEGRADATION - Degradation of poly(D,L-lactic acid) (PDLA) microspheres:...

Biomedical Materials;  September 1, 1994 ;     120 words ......microspheres during incubation were dependent on the molecular weight of raw polymers as shown by significantly different trends of time- dependent molecular weight change. The lower molecular weight polymeric microspheres exhibited a significant...

Recent Report The Market for DNA Molecular Weight Markers: Climbing The...

M2 Presswire;  September 27, 2006 ;     700+ words ......Recent Report The Market for DNA Molecular Weight Markers: Climbing The Ladder To The...Of Factors That Influence How DNA Molecular Weight Markers Are Perceived And Utilized...the addition of The Market for DNA Molecular Weight Markers: Climbing the Ladder to the...

Determining the molecular weight distribution of cotton cellulose: A new...

Textile Research Journal;  February 1, 2002 ;     700+ words ......of celluloses, including the high molecular weight cellulose of cotton, when a swelling...permeation chromatography to determine the molecular weight of cellulose. The results of using the DMI/LiCI solvent system to determine molecular weight parameters (number-average, ...

Effect of polyol molecular weight on the physical properties and...

Biomedical Materials;  October 1, 1994 ;     201 words ......crystallinity increase with polyol molecular weight, but level off at the highest...substantially with increasing PEO molecular weight (600, 1450, 8000) levelling off at the highest molecular weight. Dynamic contact angle measurements...

The dynamic mechanical characterization of a 6300 (340/22,500) weight...

Polymer Engineering and Science;  November 15, 1994 ;     700+ words ......Bimodal systems of number average molecular weight, <[M.sub.c]>, 326 to 430 were...in a sense, in actuality the high molecular weight polymer used contained a significant...blending the DGEBA with these high molecular weight polymers served only to skew the distribution...