Adhesives Correct Answer-• a substance that, when applied to the contact surfaces of two separate components, binds them together and resists their separation.
• commonly referred to as glue, paste, or cement.
Such as chemistry type, structural versus non-structural, or cure mechanism Corr...
PLTW 2.1.2 Questions with Correct Answers
Adhesives Correct Answer-• a substance that, when applied to the
contact surfaces of two separate components, binds them together and
resists their separation.
• commonly referred to as glue, paste, or cement.
Such as chemistry type, structural versus non-structural, or cure
mechanism Correct Answer-*Adhesives*
Adhesives can be classified in many ways:
1. Substrates. What materials are you bonding together?
2. Environment. What conditions will exist during the bonding process?
What conditions will exist when put into use
3. Load. What stresses (magnitude and direction) will be applied to the
joint? What type of load will be applied (repetitive, dynamic, constant,
and so on)?
4. Cost. What is the cost in terms of materials and production? Correct
Answer-*Adhesives*
Choosing an effective adhesive for a particular application requires
consideration of several factors including:
STRESSES: magnitude and direction
LOADS: repetitive, dynamic, and constant Correct Answer-*Adhesives*
What are the stresses applied to a joint? (2) What are the types of loads
applied to a joint? (3)
,1. Cyanoacrylates (super glue)
2. Hot melt glue
3. White glue
4. Wood or Carpenter's glue
5. Polyurethane (Gorilla®Glue)
6. Epoxy Correct Answer-*Adhesives*
What are the 7 types of adhesives?
Cyanoacrylates (Super Glue) Correct Answer-*Adhesives*
What is the adhesive made of?
• it is an acrylic resin.
• the main ingredient is an acrylic monomer that transforms to a plastic
state after curing.
Cyanoacrylates (Super Glue) Correct Answer-*Adhesives*
How does it work?
• it can only bond with a surface when there is moisture present. The
molecules in the glue react with the moisture to form tight chains in
between the two contact surfaces.
• a thin layer of water should be applied to dry surfaces to facilitate the
reaction. The reaction generates heat and cures instantly.
Cyanoacrylates (Super Glue) Correct Answer-*Adhesives*
What materials does it bond well with? (wood, metal, paper, plastic, and
so on)
,This type of adhesive adheres to a wide variety of materials including
rubber, glass, ceramic, wood, metals, and plastics.
Cyanoacrylates (Super Glue) Correct Answer-*Adhesives*
Advantages?
• instant bond and immediate handling strength
• good environmental resistance (resists the appearance of weathering
and aging)
• strong tensile bond.
Cyanoacrylates (Super Glue) Correct Answer-*Adhesives*
Disadvantages?
• tendency to stick to human skin
• requires moisture to form a bond
• short shelf life
• lower shear strength than epoxy
• do not fill in large gaps between materials.
Cyanoacrylates (Super Glue) Correct Answer-*Adhesives*
Common uses?
• bonding the pads of musical instruments (saxophones and clarinets)
• tacking wires to surfaces in electronics
• temporarily holding together components as an epoxy cures
• bonding skin and fingernails for topical skin closure
, Cyanoacrylates (Super Glue) Correct Answer-*Adhesives*
Other IMPT info?
• commonly called super glue or crazy glue.
• Acetone (or nail polish remover) can chemically dissolve the bonds in
this glue.
Hot Melt Glue Correct Answer-*Adhesives*
What is the adhesive made of?
It is a polymer that can be made from one of a variety of bases, which
include polyolefins, polyurethanes, and silicon rubber, among others.
Hot Melt Glue Correct Answer-*Adhesives*
How does it work?
• It is a thermoplastic adhesive that melts at a high temperature but
solidifies when cooled.
• It is melted and then applied using extrusion (typically in a hot glue
gun) or rolling or spraying the adhesive onto a surface then joining the
surfaces to be bonded.
Hot Melt Glue Correct Answer-*Adhesives*
What materials does it bond well with? (wood, metal, paper, plastic, and
so on)
This type of adhesive adheres to a wide variety of materials including
rubber, glass, ceramic, wood, metals, and plastics.
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