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HYDROXYPROPYL COPOLYMER

The use of hydroxyethyl (also hydroxypropyl) methacrylate as a monomer permits the introduction of reactive hydroxyl groups into the copolymers. This offers the possibility for subsequent cross-linking with an HO-reactive difunctional agent (diisocyanate, diepoxide, or melamine-formaldehyde resin). Hydroxyl groups promote adhesion to polar substrates. [Pg.1013]

ACPA azobis(4-cyanopentanoic acid) AIBN azobis isobutyronitrile) BPO benzoyl peroxide DVB divinyl benzene, EGA 2-ethylcyano-acrylate HPC hydroxypropyl cellulose MMA methyl methacrylate PAAc polyacrylic acid PEI polyethyleneimine, PEO/PPO polyethylene oxide/polypyropylene oxide copolymer PVME polyvinylmethylether PVP polyvinylpyrrolidone K-30 DMSO dimethylsulfoxide PGA polyglutaraldehyde CMS chloromethylstyrene PMMA-g-OSA polymethylmethacrylate grafted oligostearic acid. [Pg.202]

Synthesis of hydrolytically stable siloxane-urethanes by the melt reaction of organo-hydroxy terminated siloxane oligomers with various diisocyanates have been reported i97,i98) -yhg polymers obtained by this route are reported to be soluble in cresol and displayed rubber-like properties. However the molecular weights obtained were not very high. A later report56) described the use of hydroxybutyl terminated disiloxanes in the synthesis of poly(urethane-siloxanes). No data on the characterization of the copolymers have been given. However, from our independent kinetic and synthetic studies on the same system 199), unfortunately, it is clear that these types of materials do not result in well defined multiphase copolymers. The use of low molecular weight hydroxypropyl-terminated siloxanes in the synthesis of siloxane-urethane type structures has also been reported 198). [Pg.40]

Initiation of stannous octoate-catalyzed copolymerization of e-caprolactone with glycerol was used to prepare a series of trifunctional hydroxy-end blocked oligomers, which were then treated with hexane-1,6-diisocyanate to form elastomeric polyesterurethanes with different crosslink densities (49). Initiation of e-caprolactone polymerization with a hydroxypropyl-terminated polydimethylsiloxane in the presence of dibutyl tin dilaurate has been used to prepare a polyester-siloxane block copolymer (Fig. 4) (50). [Pg.80]

Yang JY, Xu CY, Wang C et al (2006) Refolding hydrogels self-assembled from n- (2-hydroxypropyl)methacrylamide graft copolymers by antiparallel coiled- coil formation. Biomacromolecules 7 1187-1195... [Pg.167]

Gilsonite is active as a fluid loss additive because the permeability of cement is reduced. Latex additives also act as fluid loss additives. They also act as bonding aids, gas migration preventers, and matrix intensifiers. They improve the elasticity of the cement and the resistance to corrosive fluids [921]. A styrene-butadiene latex in combination with nonionic and anionic surfactants shows less fluid loss. The styrene-butadiene latex is added in an amount up to 30% by weight of the dry cement. The ratio of styrene to butadiene in the latex is typically 2 1. In addition, a nonionic surfactant (octylphenol ethoxylate and polyethylene oxide) or an anionic surfactant, a copolymer of maleic anhydride, and 2-hydroxypropyl acrylate [719] can be added in amounts up to 2%. [Pg.147]

Suspension of water soluble solids in oil can be achieved by a variety of chemical additives. Chemical suspension additives that have been suggested include alkyl mercaptophosphonic acids(174), organophylic clay plus hydroxypropyl cellulose(175), polyols(176), aluminum stearate(177), organophylic clay plus surfactant(178-181), aluminum phosphate esters(182), and acrylate copolymers(183-184). [Pg.80]

The study was an attempt to correlate polymer structure to its activity in water treatment applications. Copolymers of acrylic acid with N-(hydroxyraethyl)-, N-(2-hydroxyethy1)-, and N-(2-hydroxypropyl) acrylamide were prepared. [Pg.283]

For cancer therapy, the well estabhshed N(-2-hydroxypropyl)methacrylamide (HMPA) polymers have been extensively studied. PKl, a 28-kDa HPMA copolymer containing doxorubicin (Figure 1.3) is now in clinical testing [15]. Other drugs that have been incorporated... [Pg.6]

A phase I clinical and pharmacokinetic study of PKl comprising doxorubicin covalently bound to N-(2-hydroxypropyl)-methacrylamide copolymer by a peptidyl linker, was carried out in 36 patients with refractory or resistant cancers [94], PKl demonstrated anti-tumour activity, and that polymer-drug conjugation decreased doxorubicin dose-limiting toxicities. Phase II studies are in progress. [Pg.225]

Eggenhuisen TM, Becer CR, Fijten MWM, Eckardt R, Hoogenboom R, Schubert US (2008) Libraries of statistical hydroxypropyl acrylate containing copolymers with LCST properties prepared by NMP. Macromolecules 41 5132-5140... [Pg.13]

The phase transition is directly related to the hydrophilic/hydrophobic balance in a copolymer and controlling the polymer composition provides a highly effective way of tuning the LCST. Another example of responsive polymer libraries was based on the combination of 2-hydroxypropyl acrylate and DMA or A-acryloyl morpholine [50]. The nitroxide mediated copolymerization conditions were chosen on the basis of the kinetic investigation of the homopolymerizations, as discussed in this chapter (see, e.g., Sect. 2.1.2). [Pg.40]

Scheme 8 Schematic representation of the synthesis of statistical copolymers of 2-hydroxypropyl acrylate (mixture of isomers) and W-acryloyl morpholine... Scheme 8 Schematic representation of the synthesis of statistical copolymers of 2-hydroxypropyl acrylate (mixture of isomers) and W-acryloyl morpholine...
Nowadays, the sieving matrices most employed in CSE are polymer solutions that under suitable conditions may form a transient mesh or sieving matrix that provide the size-based separation of charged biopolymers. The polymer solutions can be formulated with linear acrylamide and N-substituted acrylamide polymers, cellulose derivatives, polyethylene oxide, and its copolymers or with a variety of polymers, such as polyvinylpyrrolidone (PVP), polyethylene oxide (PEO), and hydroxypropyl cellulose(HPC), which do not necessitate the preventive coating of the capillary wall due to their ability to dynamically coat the inner surface of the capillary, resulting in suppressed EOE and sample interactions with the capillary wall. [Pg.187]

For (a), hydroxypropyl cellulose (HPC) (6-8), poly(vinyl pyrrolidone) (PVP) (9,10), poly(acrylic acid) (PAA) (9), and poly(dimethyl siloxane) (PDMS) (11) are usually employed. Ober et al. reported that the copolymers of isobutylene/isoprene and various methacrylates, which have weak polarity, are appropriate stabilizers for... [Pg.612]

Hydroxpropyl Cellulose Hydroxypropyl Methylcellulose Isobutylene-Isoprene Copolymer Locust Bean Gum... [Pg.130]

Another straightforward method to reduce the gloss consists in admixing a dull graft copolymer as dulling agent (33). Such copolymers may be prepared from n-butyl acrylate, allyl methacrylate, and hydroxypropyl methacrylate. Likewise, hydroxypropyl methacrylate may be substituted by maleic anhydride. The polymerization is started by 2,2 -azobi sisobu ty roni trile and peroxides. [Pg.340]


See other pages where HYDROXYPROPYL COPOLYMER is mentioned: [Pg.647]    [Pg.40]    [Pg.452]    [Pg.144]    [Pg.87]    [Pg.5]    [Pg.111]    [Pg.285]    [Pg.298]    [Pg.55]    [Pg.56]    [Pg.64]    [Pg.70]    [Pg.95]    [Pg.95]    [Pg.98]    [Pg.104]    [Pg.266]    [Pg.150]    [Pg.416]    [Pg.454]    [Pg.457]    [Pg.479]    [Pg.341]    [Pg.25]    [Pg.426]    [Pg.437]    [Pg.444]   


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Hydroxypropylation

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