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Plastics Final > Plastics Final (Part 1) > Flashcards

Plastics Final (Part 1) Flashcards

the resistance of the polymer melt to flow, representing the internal friction or stickiness of the material as it undergoes deformation during processing

1
Q

Viscoelasticity

A

the resistance of the polymer melt to flow, representing the internal friction or stickiness of the material as it undergoes deformation during processin

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2
Q

Creep vs. Stress Relaxation

A

Creep: The gradual deformation of a material under constant stress over time.
-Stress Relaxation: The decrease in stress within a material under constant strain over time.

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3
Q

Creep Curves

A

Graphical representation showing how strain changes with time under constant stres

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4
Q

Specific Heat / Heat Capacity

A

The amount of heat energy required to raise the temperature of a unit mass of a substance by one degree Celsius.

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5
Q

Thermal Conductivity

A

The ability of a material to conduct heat

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6
Q

Coefficient of Thermal Expansion

A

The measure of how a material expands or contracts with a change in temperature, a homework assignment might involve calculations related to this property

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7
Q

Polymer Degradation Mechanisms

A

Swelling / Dissolution, and Chain Scission

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8
Q

Swelling / Dissolution

A

The absorption of a solvent causing the polymer to swell or dissolve

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9
Q

Chain Scission

A

Breakage of polymer chains, leading to a reduction in molecular weight

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10
Q

Testing Methods to Evaluate Degradation

A

Techniques used to assess the extent of degradation, such as spectroscopy or mechanical testing

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11
Q

Rheology

A

how polymers deform and flow under the influence of applied stress, encompassing factors such as viscosity, shear rate, and temperature.

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12
Q

Newtonian vs. Non-Newtonian Behavior

A

Newtonian fluids have constant viscosity, while non-Newtonian fluids exhibit variable viscosity under different shear rates

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13
Q

Shear Stress, Shear Rate, Viscosity

A

Parameters describing the behavior of materials under she

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14
Q

Viscosity vs. Shear Rate Curves

A

Graphical representation depicting how viscosity changes with shear rate

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15
Q

Melt Flow Rate Testing

A

A measure of a polymer’s flowability under specific temperature and pressure conditions

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16
Q

“Apparent” Rheological Properties

A

Properties observed under specific conditions, which may differ from the material’s true rheological behavior

17
Q

Factors that Influence the Response

A

Variables affecting how a material responds to applied stress or deformation.

18
Q

Fillers vs. Reinforcements

A

Distinction between materials added to enhance specific properties (fillers) and those added for strength (reinforcements)

19
Q

Fibrous Reinforcement Issues

A

Challenges and considerations related to using fibrous materials to reinforce polymers.

20
Q

Material Selection for an Application

A

Functional Requirements:
- Identifying the desired properties a material must possess for a specific application.

21
Q

Base Resin Morphology / Properties

A

Understanding the inherent properties and structure of the base polymer.

22
Q

Additive Packages for Application Specific Improvements / Protection

A

Selection of additives to enhance specific performance or protect against degradation

23
Q

Iso-stress vs. Iso-strain Loading

A

Different loading conditions in composite materials where stress or strain is held constant

23
Q

PMC

A

Polymer Matrix Composites

24
Q

MMC

A

Metal Matrix Composites

25
Q

CMC

A

Ceramic Matrix Composites

26
Q

Composites Calculations

A

Mathematical computations related to composite materials

27
Q

Chemistry of Ceramics

A

The chemical composition and structure of ceramic materials

28
Q

Raw Materials / Additives

A

Components used in the production of ceramics

29
Q

Properties of Ceramic

A

Characteristics like hardness, brittleness, and thermal resistance

30
Q

Industrial Applications of Ceramics

A

Practical uses of ceramics in various industries

Plastics Final (2 decks)

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