How many types of thermosetting plastics are there?

Answer 1

There are Multiple:

Bakelite-which is used for cameras, rods, tubes… this plastic isn't often used.

Epoxy- which is used for surfboards and other things that need to stand extreme forces.

Melamine resin- this can make plates and other non-microwaveable kitchen utensils.

Polyimide- this plastic is known for thermal stability, good chemical resistance, excellent mechanical properties. It is normally orange/yellow colour.

Urea-formaldehyde- it is high tensile strength, flexural modulus and heat distortion temperature, low water absorption, mould, high surface hardness, elongation at break, and volume resistance.

Diallyl Iso Phthalate / Diallyl Ortho Phthalate:

These compounds are easy to mold and have no out gassing. They can be molded in compression, transfer, or injection equipment.

Cosmic DAP compounds are non-corrosive to inserts and resistant to weathering, fungus, and most solvents.

Fully cured parts manufactured from Cosmic DAP possess unsurpassed dimensional stability, even under load. They withstand solder temperature and will not creep after curing. That is why this state of the art material is used extensively in the space program, the connector and the electronics industries.

Offered in a variety of colors and flows, Cosmic DAPs do not require cold storage and have an average shelf life of one year at 23 ° C.

Cosmic Epoxy compounds are specially made to suit each customer's requirements.

These materials possess outstanding electrical, mechanical, and thermal properties, and are available in the following grades:

Electrical Grades

The Electrical Grades offer superior electrical properties, dimensional stability, and mechanical strength. They are widely used in underwater connectors and other electrical insulation applications.

Electronic Encapsulation Grades

The Electronic Encapsulation Grades offer excellent adhesion to substrates good thermal shock and moisture resistance. These materials are predominantly used in passive devices such as resistors, resistor networks, inductors, capacitors, coils, switches, bushings, and relays. Supplied in a wide range of flows, they can be either injection, transfer, or compression molded. They flow easily at low pressure and have no out gassing.

Structural Grades

The Structural Grades offer high mechanical strength for use in aircraft structures and other applications to replace heavy metal parts. They can be either compression or transfer molded.

EMI Shielding and Conductive Grade

EMI Shielding and Conductive Grades offer a variety of shielding strengths for fabrication of core rods and to encapsulate surface mount and axial leaded inductors. This single molded compound eliminates the labor intensive over and under molding.

Farboset Molding Compounds

Farboset molding compounds are anhydride and novolac grade epoxy thermoset compounds formulated to provide superior electrical and moisture resistance properties.

Farboset Powder Coatings

Farboset powder coatings are nonanhydride dielectric grade epoxy powder coating is formulated to provide superior electrical and moisture resistance properties.

Alkyds are polyester based thermosets.

These materials offer good electrical insulation, dimensional stability, and mechanical strength and are used in circuit breakers, relays, switches, coil bobbins, terminal boards, and connectors.

Answer 2

A Thermoplastic, also known as a thermosoftening plastic, is a polymer that becomes pliable or moldable above a specific temperature, and returns to a solid state upon cooling. Most thermoplastics have a high molecular weight, whose chains associate through intermolecular forces; this property allows thermoplastics to be remolded because the intermolecular interactions spontaneously reform upon cooling. In this way, thermoplastics differ from thermosetting polymers, which form irreversible chemical bonds during the curing process; thermoset bonds break down upon melting and do not reform upon cooling.

In the following table a list of thermoplastic materials and a few of their properties is reported from different bibliographies (like listed on the relative wikipedia page)

Bulk properties of pure cast or hot formed materials. Properties could change considerably by mechanical treatment and cold forming. Fiber and foils are not considered.

name Symbol Density
[g/cm3] Tensile strength
[MPa] Flexural strength
[MPa] Elastic modulus
[GPa] Elongation at rupture
[%] Thermal stability
[°C] Expansion at 20°C
[10−6/°C] High Density PolyethyleneHDPE 0.95 31 40 1.86 100 120 126
Low Density PolyethyleneLDPE 0.92 17 14 0.29 500 90 160 Polyvinyl Chloride PVC 1.44 47 91 3.32 60 80 75 PolypropylenePP 0.91 37 49 1.36 350 150 90 Polyethylene terephthalate PET 1.35 61 105 1.35 170 120 70 PolymethylmethacrylatePMMA 1.19 61 103 2.77 4 100 65 PolycarbonatePC 1.2 68 95 2.3 130 120 66 Acrylonitrile butadiene styrene ABS 1.05 45 70 2.45 33 70 90 PolyamideNylon 6 1.13 60 91 2.95 60 110 66 Polyimide PI 1.38 96 143 3.1 7 380 43 PolysulfonePSF 1.25 68 115 2.61 75 160 56 Polyamide-imide, electrical grade PAI 1.41 138 193 4.1 12 260 30 Polyamide-imide, bearing grade PAI 1.46 103 159 5.5 6 260 25 PolytetrafluoroethylenePTFE 2.17 24 33 0.49 300 260 95 PolyetherimidePEI 1.27 105 151 2.9 60 210 31
Polyether ether ketone PEEK 1.32 100 3.6 50 343 Polyaryletherketone(strong) PEAK 1.46 136 213 12.4 2.1 267 Polyaryletherketone(tough) PEAK 1.29 87 124 3 40 190 Self-reinforced polyphenyleneSRP 1.19 152 234 5.52 10 151 Polyamide-imidePAI 1.42 152 241 4.9 15 278

Answer 3

plastics which melts on heating and can be reused by giving another shape are called thermoplastics...

Answer 4

I know seven of them.

-PVC

-PET

-Polystyrene

-Polytetraflyoroethylene

-Saran

-LDPE

-HDPE

Answer 5

Acrylic, PVC etc