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INCIDENT LIGHT WAVE [3 records]

Record 1 2006-04-03

English

Subject field(s)
  • Chemical Elements and Compounds
  • Plastics Manufacturing
  • Rubber
  • Paints and Varnishes (Industries)
DEF

Any chemical compound that, admixed with a thermoplastic resin, selectively absorbs ultraviolet rays; used to prevent ultraviolet degradation of polymers.

CONT

When a polymer absorbs light, it may reradiate the absorbed energy at much longer wave lengths(heat), at slightly longer wave lengths(luminescence), or the energy may be transferred to another molecule. When none of these processes is operative, the absorbed light energy may cause bond breaking leading to degradation. By incorporating an ultraviolet absorbing compound into the plastic, it is possible to essentially eliminate all of the above processes, since the absorber even at concentrations as low as 0. 5% can effectively compete for the incident ultraviolet radiation, thus protecting the plastic form degradation. A second approach to stabilization is to incorporate an additive which, though not an absorber in itself, can accept energy from the polymer substrate, and thus, leave the polymer intact. Since protection of plastics against light degradation can be achieved by these two mechanisms, the broader term "ultraviolet stabilizer" or "light stabilizer" is used to refer to such additives.

French

Domaine(s)
  • Éléments et composés chimiques
  • Plasturgie
  • Caoutchouc
  • Peintures et vernis (Industries)
DEF

Produit chimique que l'on ajoute à un matériau macromoléculaire (matière plastique, élastomère, fibre) pour le protéger contre l'action dégradante des rayons ultraviolets.

CONT

Le principe de l'agent anti-UV est d'absorber l'énergie reçue sans réémettre dans le visible. Les principaux produits utilisés sont la benzophénone et le benzotriazol. Il faut noter également que l'introduction de certains pigments (oxydes métalliques, noir de carbone) favorise la résistance aux UV de même que l'application d'un revêtement (peinture).

OBS

ultraviolet : Cette graphie, puisée des Rectifications de l'orthographe recommandées par le Conseil supérieur de la langue française, est attestée dans le Petit Robert (2006).

OBS

agent anti-UV : terme normalisé par l'AFNOR.

Key term(s)
  • agent anti U.V.
  • agent anti-ultraviolet
  • anti-ultraviolet
  • stabilisant ultraviolet

Spanish

Campo(s) temático(s)
  • Elementos y compuestos químicos
  • Fabricación de plásticos
  • Caucho
  • Pinturas y barnices (Industrias)
Save record 1

Record 2 1991-05-14

English

Subject field(s)
  • Computer Graphics

French

Domaine(s)
  • Infographie

Spanish

Save record 2

Record 3 1986-06-16

English

Subject field(s)
  • Acoustics (Physics)
CONT

... the reflected wave front makes the same angle with the interface as the incident wave front. This... constitutes the law of reflection. Equally well expressed in terms of the incident and reflected rays, this law is the same law that holds for light, namely, that the angle of reflection is equal to the angle of incidence.

Key term(s)
  • incident sound ray

French

Domaine(s)
  • Acoustique (Physique)
OBS

par analogie avec "intensité (acoustique) incidente" : TECBA, 1970, vol. 3, no. 3381, p. 1-2.

OBS

voir fiche "sound ray".

Spanish

Save record 3

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