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Cross-Linking extremely thin corneas - The ELZA Institute

The original Dresden protocol allows CXL to be performed safely when the thickness of the cornea is 400 μm or higher. However, in advanced cases of keratoconus, pellucid marginal degeneration and post-LASIK ectasia, the cornea may be thinner. This causes a problem - but members of ELZA have been coming up with solutions to this problem, and it comes down to …

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Cross-linking polymers – alginate worms

Cross-linking polymers – alginate worms This practical provides a fun look at cross-linking and a chance to explore some of the many and varied uses of sodium alginate. Sodium alginate is a polysaccharide of repeating monosaccharide units, each containing a carboxylate ion: Figure 1 Structure of sodium alginate

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STUDY OF CO MOBILITY CONTROL USING CROSS-LINKED …

cross-linked polymer gel treatment and CO 2 viscosifier study and produced images with sharp phase contrasts. For the gel conformance study, promising results were obtained by applying cross-linked gel to eliminate permeability contrast and diverting CO 2 into low permeability regions to obtain incremental oil recovery; also studied were the gel

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Corneal Cross Linking - Illinois Eye and Ear Infirmary

Cross-linking, which has been performed in Europe since 2003, is considered the standard of care around the world for keratoconus and corneal ectasia following refractive surgery 2. Corneal Cross-Linking 3 . Creates new corneal collagen cross-links; Results in a shortening and thickening of the collagen fibrils; Leads to the stiffening of the ...

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Polyfunctional Aziridine Supplier - PolyAziridine LLC

These cross-linkers are used to improve physical and chemical properties for both aqueous and non-aqueous coatings, as well as a variety of adhesives. PolyAziridine LLC is dedicated to providing a complete line of polyfunctional aziridine cross-linkers and creates a unique partnership with customers to provide necessary technical support.

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Supporting Information for Mechanism of Shear Thickening ...

Activation energies of the four cross-linkers In our experiments, the activation energies of the four cross-linkers are calculated as follows. For our cross-linkers, k d is expected to increase with the increasing of temperature. S9 While the k d of four cross-linkers at 25 °C are known (Table 1), the value of k

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Hydrocolloids as thickening and gelling agents in food: a ...

Nov 06, 2010· Thickening agents. Hydrocolloids are frequently used in several foods for thickening. The process of thickening involves the non-specific entanglement of conformationally disordered polymer chains; it is essentially a polymer-solvent interaction (Philips et al. 1986).Thickening occurs above a critical concentration known as overlap concentration …

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Mechanism of Shear Thickening in Reversibly Cross-linked ...

Under steady shear, shear thickening is observed above a critical shear rate, and that critical shear rate is experimentally correlated with the lifetime of the metal-ligand bond. The onset and magnitude of the shear thickening depend on the amount of cross-linkers added.

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Latent cross-linking thickeners and rheology modifiers ...

Feb 12, 2002· A latent cross-linking thickener or rheology modifier composition comprising a polymeric thickener which has been modified to comprise at least one functionality capable of forming cross-links. 2. The composition of claim 1 wherein said cross-linking occurs after the thickener is applied to a substrate. 3.

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Solutions for waterborne synthetic materials

1020 PU 20% Newtonian VOC free polyurethane associative thickener for controlling levelling and rheology in graveoure coating 1022 PU 25% Medium pseudoplastic polyurethane associative thickener for coating formulations 170 AIR PU 50% Medium pseudoplastic VOC free polyurethane associative thickener for coating formulations ® matting additives

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Corneal Cross-Linking - Louisiana Eye & Laser Center

Corneal Cross-Linking. Creates new corneal collagen cross-links; Results in a shortening and thickening of the collagen fibrils; Leads to the stiffening of the cornea; Riboflavin. Riboflavin (vitamin B2) is important for body growth, red blood cell production and assists in releasing energy from carbohydrates. Its food sources include dairy ...

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Formula Troubleshooting: Acrylate-based Thickening

May 29, 2013· Most acrylate-based thickeners used in skin care are very high molecular weight cross-linked polymers of acrylic acid. Due to this particular structure, these polymers can thicken and modify the rheology of skin care products as well as provide suspension and emulsion stabilization.

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VISIOMER®Methacrylates for surfactants & Thickeners ...

Acrylic thickeners are commonly produced by emulsion polymerization. One of the most important monomers for this kind of thickeners is Methacrylic acids. Usually, crosslinkers like VISIOMER® AMA or EGDMA are added in the formulation in a low concentration in order to increase the molecular weight of the produced polymer. Another type of ...

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Sodium Polyacrylate cross-linked |

Sodium Polyacrylate cross-linked; CAS Number: ; Synonyms: 2-propenoic acid, homopolymer, sodium salt,Poly(acrylic acid), partial sodium salt-graft-poly(ethylene oxide); find Sigma-Aldrich-432784 MSDS, related peer-reviewed papers, technical documents, similar products & more at Sigma-Aldrich

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Polymerization | SEPPIC

Polymerization. Thickening polymers are among the most-used ingredients in formulations. Because of their ability to govern rheological behavior, they are essential ingredients for controlling usage performance and ensuring users have a positive perception of the products. At Seppic, we use two main polymerization technologies: inverse emulsion ...

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Strain Hardening and Strain Softening of Reversibly Cross ...

The divergent strain softening of samples with faster cross-linkers in semidilute entangled PVP solutions, relative to the strain hardening of samples with slower cross-linkers, is consistent with observed shear thinning/shear thickening behavior reported previously and is attributed to the fact that the average time that a cross-linker remains ...

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Textiles & Nonwovens - StarChem

Textiles & Nonwovens. StarChem is leading chemical manufacture for the global textile market. Our main manufacturing site has been producing textile auxiliaries in Wellford, SC for over 50 years. With facilities in Choloma Honduras and Quebec Canada, we can provide local technical technical service, sales, and marketing support in North and ...

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Cross-Linking in Shear-Thickening Ionomers — Princeton ...

Dive into the research topics of 'Cross-Linking in Shear-Thickening Ionomers'. Together they form a unique fingerprint. Ionomers Engineering & Materials Science . Ionomer Chemical Compounds 78%. Shear Chemical Compounds 63%. Thickening ...

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- allnex

Special PUR thickener with excellent compatibility in transparent systems. Flow & Leveling: MODAFLOW® AQ 3025: MODAFLOW® AQ-3025 provides outstanding surface appearance in waterborne paint systems. FDA approved, this additive …

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Emulsion Explosives - Lubrizol

Cross-linkers Our cross-linkers make the emulsion stiff or rubbery. The explosive will then harden and "lock" itself into a bore hole, fractured hole or up hole. This patented cross-linking technology provides solutions to severe loading conditions.

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(PDF) Novel crosslinking method for preparation of acrylic ...

Glycidyl cross-linking has significantly better thickening efficiency in comparison with vinyl cross-linking for microgel preparation [20]. Between PEGDGE and …

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Reference Guide - | Brenntag

consumer and industrial markets. We use good chemistry to make great things happen for customers in more than 100 countries. Our innovative products and services add value to …

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Crosslinker - an overview | ScienceDirect Topics

Cross-linker is the chemical used to create a cross-linked fluid system. When cross-linker is combined with a 20–30 lb linear gel system, cross-linked fluid is created.Cross-linker increases the viscosity of gelling agents by connecting the separate gel polymers together.

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Specialty Chemicals - MCTRON Technologies

MaxxLink ® Cross-Linkers MCTRON's MaxxLink® line of cross-linkers is designed specifically to enhance the performance of emulsion polymers, starch, polyvinyl alcohol and other polymers requiring enhanced properties like improved water resistance, heat resistance, durability.

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Mechanism of Shear Thickening in Reversibly Cross-Linked ...

Mechanism of Shear Thickening in Reversibly Cross-Linked Supramolecular Polymer Networks Donghua Xu, Jennifer L. Hawk, David M. Loveless, Sung Lan Jeon, and Stephen L. Craig* Department of Chemistry and Center for Biologically Inspired Materials and Material Systems, Duke University, Durham, North Carolina 27708-0346

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Food Grade Thickener Cross Linked Carboxymethyl Cellulose

High quality Food Grade Thickener Cross Linked Carboxymethyl Cellulose from China, China's leading 25kg bag Cross Linked Carboxymethyl Cellulose product, with strict quality control Honest Food Grade CAS 9004 32 4 factories, producing high quality Refined cotton Cross Linked Carboxymethyl Cellulose products.

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Carbopol® for Cosmetic Ingredients Supplied by Lubrizol

Carbomer. Carbopol® 2984 polymer by Lubrizol is a rheology modifier, thickener and suspending agent. It is a cross-linked polyacrylic acid polymer that …

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Cross-linked Acrylics - Cosmetics Ingredients Selection ...

Cross-linked acrylate copolymer. NM-Carbomer 1342 by Anhui Newman Fine Chemicals is a thickener, stabilizer and antimicrobial agent. Has long …

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Paints & Coating - Markets & Products | Visen Industries ...

Cross-linked Acrylic : Thickener for Paints and Textured finishes: VISICRYL 844: 22± 1: 8 - 10: Ammonium poly Acrylate: Ready Thickener for water based Paints: VISICRYL 960: 30± 0.5: 3 - 4: Associative Thickener(HASE Type) Rheology Modifier for water borne coatings with good flow and leveling and Spatter Resistance: VISICRYL 825: 25± 1: 2 ...

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Impact of cross-linker amount on thickening performance in ...

When used in thickening a latex of P(St–BA) (Poly(styrene–Butyl acrylate)) copolymer using a thickener copolymer with 12 wt% of SEM-25, addition …

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Cross-linking in Hydrogels - A Review

Apr 02, 2014· the polymer is altered through the cross linking process. Cross linking by irradiation is done by using high-energy ionizing radiation, like electron beam (e-beam), gamma, or x-ray. Gamma irradiation is usually most economical at lower doses (~80 kGy and below) and for large, high density parts.

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US3437493A - Cross-linked cereal starch thickener for ...

US3437493A US476742A US3437493DA US3437493A US 3437493 A US3437493 A US 3437493A US 476742 A US476742 A US 476742A US 3437493D A US3437493D A US 3437493DA US 3437493 A US3437493 A US 3437493A Authority US United States Prior art keywords starch hydroxypropyl cereal linked granular Prior art date Legal status …

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