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adhezj

Adhezj is a term encountered in technical literature to denote adhesion—the tendency of different materials to cling to each other at an interface. Depending on the field, adhezj may refer to the formation of a bond between an adhesive and a substrate, the integrity of a coated surface, or the general interfacial forces that resist separation. In materials science, adhesion is distinguished from cohesion: adhesion refers to bonding at interfaces, while cohesion refers to internal bonding within a material.

Adhezj results from three main mechanisms: mechanical interlocking, chemical bonding (ionic, covalent, hydrogen), and physical forces

Assessment of adhezj typically involves mechanical tests such as peel tests (delamination at the interface), tensile

Applications of adhezj span many industries. They include adhesives and sealants for construction, packaging, and electronics;

(van
der
Waals,
electrostatic).
The
effectiveness
of
adhesion
is
influenced
by
surface
energy,
cleanliness,
roughness,
temperature,
humidity,
and
the
chemical
compatibility
of
the
adhesive
and
substrate.
Surface
treatments,
primers,
and
coupling
agents
are
often
used
to
enhance
adhezj
by
increasing
chemical
or
mechanical
compatibility.
or
shear
tests
(lap
shear,
pull-off),
and
sometimes
fracture
energy
measurements.
The
observed
failure
mode—adhesive
at
the
interface,
cohesive
within
the
adhesive
or
substrate,
or
a
mixed
case—helps
diagnose
the
strength
and
reliability
of
the
bond.
coatings
and
laminates;
dental
and
biomedical
adhesives;
and
various
bonding
solutions
in
manufacturing.
Understanding
adhezj
is
essential
for
designing
durable
interfaces
and
selecting
compatible
materials
and
surface
treatments.
See
also:
Adhesion,
Adhesive,
Surface
energy,
Interfacial
bond.