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CROSS-LINKING REACTION [11 records]

Record 1 2015-02-23

English

Subject field(s)
  • Chemistry
  • Plastics Manufacturing
  • Synthetic Fabrics
DEF

The establishing of chemical links between the molecular chains in polymers.

OBS

Cross-linking can be accomplished by chemical reaction, vulcanization, and electron bombardment. Degree of cross-linking depends on the specific polymer. However, the resultant properties are usually improved.

OBS

crosslinking: term standardized by ISO.

French

Domaine(s)
  • Chimie
  • Plasturgie
  • Textiles artificiels et synthétiques
DEF

Passage d'un polymère d'un état où les macromolécules qui le constituent sont indépendantes à un état où elles sont reliées entre elles par des liaisons chimiques.

CONT

Si un polymère possède des fonctions actives dans la chaîne [...] ou en bout de chaîne, [...] il est possible de les faire réagir avec un agent polyfonctionnel pour obtenir un réseau. Cet agent est généralement appelé durcisseur ou agent de pontage et le polymère de départ est appelé prépolymère. L'opération s'appelle une réticulation (vulcanisation dans le cas de caoutchoucs).

OBS

La réticulation d'un polymère correspond à la formation d'un réseau.

OBS

réticulation : terme normalisé par l'ISO.

Spanish

Campo(s) temático(s)
  • Química
  • Fabricación de plásticos
  • Tejidos sintéticos
DEF

Proceso de múltiples enlazamientos intermoleculares covalentes o iónicos entre cadenas de polímeros.

Save record 1

Record 2 2011-08-09

English

Subject field(s)
  • Biological Sciences
DEF

A network or framework, as of fibers, filaments or macromolecular chains.

CONT

In order to prepare efficient immobilized E. coli cells, the type and concentration of bifunctional reagent for cross-linking and the concentration of acrylamide monomer for lattice formation were investigated systematically. These studies showed that microbial cells, macromolecular enzymes and nucleic acids are not lost from the gel lattice during the enzyme reaction, but the low molecular substrate and product can pass freely through the gel lattice.

French

Domaine(s)
  • Sciences biologiques
DEF

Structure macromoléculaire tridimensionnelle dans laquelle les chaînes sont reliées entre elles par des liaisons le plus souvent covalentes.

CONT

Les enzymes sont immobilisées par diverses méthodes afin de prolonger le plus longtemps possible leur action dans le réacteur de production. Les molécules enzymatiques peuvent être retenues par adsorption ou par liaison chimique sur un support solide comme la cellulose. Elles peuvent aussi être emprisonnées dans un réseau formé par un polymère perméable, tel qu'un gel de silice. Elles peuvent enfin être enfermées dans des capsules sphériques faites de membranes de polymères semi-perméables.

Spanish

Save record 2

Record 3 2011-06-03

English

Subject field(s)
  • Plastics Manufacturing
  • Rubber
Universal entry(ies)
Ti(OC4H9)4
formula, see observation
5593-70-4
CAS number
OBS

Properties : Colorless to light-yellow liquid... Derivation :Reaction of titanium tetrachloride with butanol. Use : Ester exchange reactions; heat-resistant paints(up to 500C) ;improving adhesion of paints, rubber, and plastics to metal surfaces; cross-linking agent; condensation catalyst.

OBS

Chemical formula : Ti(OC4H9)4

French

Domaine(s)
  • Plasturgie
  • Caoutchouc
Entrée(s) universelle(s)
Ti(OC4H9)4
formula, see observation
5593-70-4
CAS number
OBS

Formule chimique : Ti(OC4H9)4

Spanish

Campo(s) temático(s)
  • Fabricación de plásticos
  • Caucho
Entrada(s) universal(es)
Ti(OC4H9)4
formula, see observation
5593-70-4
CAS number
OBS

Fórmula química : Ti(OC4H9)4

Save record 3

Record 4 2007-01-31

English

Subject field(s)
  • Chemistry
CONT

A urethane is formed from the reaction of an isocyanate with an alcohol. In general, polyurethanes are made using a diisocyanate, a low molecular weight diol(thermoplastic) and/or triol(cross-linked), and a polyether glycol or a polyester glycol. If the reagents are difunctional, a non cross-linked thermoplastic polyurethane will be formed; if the functionality of at least one of the reagents is greater than two, a cross-linked or three dimensional network will form. Cross-linked polyurethanes exhibit less mechanical creep than non cross-linked polyurethanes. The rubbery modulus of polyurethanes increases as the level of cross-linking is increased. Polyurethanes are diblock copolymers. They consist of hard segments(isocyanate and the chain extender rich areas) that act as physical crosslinks, and soft segments(polyether or polyester glycol rich areas).

French

Domaine(s)
  • Chimie
CONT

Les adhésifs époxydes sont constitués de : [...] un (ou des) durcisseur(s) ou agent(s) de réticulation qui, par réaction chimique avec les groupements époxydes, permettent la formation du réseau tridimensionnel réticulé.

CONT

La structure des TD (résines thermodurcissables) a la forme d'un réseau tridimensionnel qui se ponte (double liaison de polymérisation) pour durcir en forme de façon définitive, lors d'un échauffement. La transformation est donc irréversible.

Spanish

Save record 4

Record 5 2006-05-12

English

Subject field(s)
  • Chemical Elements and Compounds
CONT

A urethane is formed from the reaction of an isocyanate with an alcohol. In general, polyurethanes are made using a diisocyanate, a low molecular weight diol(thermoplastic) and/or triol(cross-linked), and a polyether glycol or a polyester glycol. If the reagents are difunctional, a non cross-linked thermoplastic polyurethane will be formed; if the functionality of at least one of the reagents is greater than two, a cross-linked or three dimensional network will form. Cross-linked polyurethanes exhibit less mechanical creep than non cross-linked polyurethanes. The rubbery modulus of polyurethanes increases as the level of cross-linking is increased. Polyurethanes are diblock copolymers. They consist of hard segments(isocyanate and the chain extender rich areas) that act as physical crosslinks, and soft segments(polyether or polyester glycol rich areas).

French

Domaine(s)
  • Éléments et composés chimiques

Spanish

Save record 5

Record 6 2005-06-20

English

Subject field(s)
  • Chemical Engineering
CONT

A urethane is formed from the reaction of an isocyanate with an alcohol. In general, polyurethanes are made using a diisocyanate, a low molecular weight diol(thermoplastic) and/or triol(cross-linked), and a polyether glycol or a polyester glycol. If the reagents are difunctional, a non cross-linked thermoplastic polyurethane will be formed; if the functionality of at least one of the reagents is greater than two, a cross-linked or three dimensional network will form. Cross-linked polyurethanes exhibit less mechanical creep than non cross-linked polyurethanes. The rubbery modulus of polyurethanes increases as the level of cross-linking is increased. Polyurethanes are diblock copolymers. They consist of hard segments(isocyanate and the chain extender rich areas) that act as physical crosslinks, and soft segments(polyether or polyester glycol rich areas).

French

Domaine(s)
  • Génie chimique
CONT

nous [...] sommes restés dans l'idée d'utiliser un diluant réactif difonctionnel qui jouera le rôle de plastifiant interne. Ce diluant, par sa présence, diminuera la viscosité du mélange fondu et augmentera son temps de gel.

Spanish

Save record 6

Record 7 2005-06-20

English

Subject field(s)
  • Chemistry
CONT

A urethane is formed from the reaction of an isocyanate with an alcohol. In general, polyurethanes are made using a diisocyanate, a low molecular weight diol(thermoplastic) and/or triol(cross-linked), and a polyether glycol or a polyester glycol. If the reagents are difunctional, a non cross-linked thermoplastic polyurethane will be formed; if the functionality of at least one of the reagents is greater than two, a cross-linked or three dimensional network will form. Cross-linked polyurethanes exhibit less mechanical creep than non cross-linked polyurethanes. The rubbery modulus of polyurethanes increases as the level of cross-linking is increased. Polyurethanes are diblock copolymers. They consist of hard segments(isocyanate and the chain extender rich areas) that act as physical crosslinks, and soft segments(polyether or polyester glycol rich areas).

French

Domaine(s)
  • Chimie
CONT

Les adhésifs époxydes sont constitués de : [...] un (ou des) durcisseur(s) ou agent(s) de réticulation qui, par réaction chimique avec les groupements époxydes, permettent la formation du réseau tridimensionnel réticulé.

OBS

La structure des TD (résines thermodurcissables) a la forme d'un réseau tridimensionnel qui se ponte (double liaison de polymérisation) pour durcir en forme de façon définitive, lors d'un échauffement. La transformation est donc irréversible.

Spanish

Save record 7

Record 8 2005-06-20

English

Subject field(s)
  • Plastic Materials
CONT

A urethane is formed from the reaction of an isocyanate with an alcohol. In general, polyurethanes are made using a diisocyanate, a low molecular weight diol(thermoplastic) and/or triol(cross-linked), and a polyether glycol or a polyester glycol. If the reagents are difunctional, a non cross-linked thermoplastic polyurethane will be formed; if the functionality of at least one of the reagents is greater than two, a cross-linked or three dimensional network will form. Cross-linked polyurethanes exhibit less mechanical creep than non cross-linked polyurethanes. The rubbery modulus of polyurethanes increases as the level of cross-linking is increased. Polyurethanes are diblock copolymers. They consist of hard segments(isocyanate and the chain extender rich areas) that act as physical crosslinks, and soft segments(polyether or polyester glycol rich areas).

CONT

It has been reported that the glassy and rubbery modulus of a curing resin is relatively insensitive to the degree of cure of the material.

French

Domaine(s)
  • Matières plastiques

Spanish

Save record 8

Record 9 2000-06-21

English

Subject field(s)
  • Textile Industries
  • Synthetic Fabrics
  • Phraseology
CONT

solid-state polymerization :Reaction of the active end-groups within a solid polymer. It may be intentional as in heating and drying nylon 66 to increase the final degree of polymerization; or it may be undesirable such as that which occurs in fibers under high-temperature conditions in tires that leads to increased degree of polymerization, cross-linking, and subsequent brittleness and loss of strength.

Key term(s)
  • under high temperature conditions

French

Domaine(s)
  • Industries du textile
  • Textiles artificiels et synthétiques
  • Phraséologie

Spanish

Save record 9

Record 10 2000-06-21

English

Subject field(s)
  • Textile Industries
  • Synthetic Fabrics
DEF

solid-state polymerization :Reaction of the active end-groups within a solid polymer. It may be intentional as in heating and drying nylon 66 to increase the final degree of polymerization; or it may be undesirable such as that which occurs in fibers under high-temperature conditions in tires that leads to increased degree of polymerization, cross-linking, and subsequent brittleness and loss of strength.

Key term(s)
  • solid state polymerization

French

Domaine(s)
  • Industries du textile
  • Textiles artificiels et synthétiques

Spanish

Save record 10

Record 11 1994-10-24

English

Subject field(s)
  • Chemistry
DEF

Cross-linking reaction between two adjacent molecular claims.

French

Domaine(s)
  • Chimie

Spanish

Save record 11

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