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37 Cards in this Set

  • Front
  • Back

A copolymer in which two differentrepeat units alternate positions along the molecular chain.

alternating copolymer

A type of polymer chain configuration (stereoisomer)in which side groups are randomly positioned on one side ofthe chain or the other.

atactic

Designates monomers that may react to formtwo covalent bonds with other monomers to create a two dimensional chainlike molecular structure.

bifunctional

A linear copolymer in which identical repeatunits are clustered in blocks along the molecular chain

block copolymer

A polymer having a molecular structure ofsecondary chains that extend from the primary main chains.

branched polymer

For crystalline polymers, a model thatdescribes the structure of platelet crystallites. Molecularalignment is accomplished by chain folding that occurs at thecrystallite faces.


chain-folded model

For polymers, a prefix denoting a type of molecular structure.For some unsaturated carbon chain atoms within arepeat unit, a side atom or group may be situated on one sideof the double bond or directly opposite at a 180_ rotation position.In a cis structure, two such side groups within the samerepeat unit reside on the same side (e.g., cis-isoprene)

cis

A polymer that consists of two or more dissimilarrepeat units in combination along its molecular chains.

copolymer

A polymer in which adjacent linear molecular chains are joined at various positions by covalent bonds.

crosslinked polymer

For polymers, the state in which a periodic andrepeating atomic arrangement is achieved by molecular chainalignment.

crystallinity

A region within a crystalline polymer in which all themolecular chains are ordered and aligned.

crystallite

The average number of repeatunits per polymer chain molecule.

degree of polymerization

The number of covalent bonds a monomer canform when reacting with other monomers.

functionality

A copolymer in which homopolymer side bybranches of one monomer type are grafted to homopolymermain chains of a different monomer type.

graft copolymer

A polymer having a chain structure in which allrepeat units are of the same type

homopolymer

The phenomenon by which two or more polymermolecules or repeat units have the same composition but differentstructural arrangements and properties.

isomerism

A type of polymer chain configuration (stereoisomer)in which all side groups are positioned on the same side of thechain molecule.

isotactic

A polymer produced from bifunctional monomersin which each polymer molecule consists of repeat unitsjoined end to end in a single chain.

linear polymer

A huge molecule made up of thousands ofatoms.

macromolecule

With regard only to composition,not the structure of a repeat unit.

molecular chemistry (polymer)

With regard to atomic arrangements within and interconnections between polymer molecules

molecular structure

The sum of the atomic weights of all theatoms in a molecule.

molecular weight

A stable molecule from which a polymer is synthesized

monomer

A polymer produced from multifunctionalmonomers having three or more active covalent bonds, resultingin the formation of three-dimensional molecules.

network polymer

A compound of high molecular weight (normally organic),the structure of which is composed of chains of small repeat units

polymer

A polymer in which two different repeatunits are randomly distributed along the molecular chain.

random copolymer

The most fundamental structural unit in a polymerchain. A polymer molecule is composed of a large number ofrepeat units linked together.

repeat unit

A carbon atom that participates in only single covalent bonds with four other atoms.

saturated

An aggregate of ribbon-like polymer crystallites(lamellae) radiating from a common central nucleation site; thecrystallites are separated by amorphous regions.


spherulite

Polymer isomerism in which side groupswithin repeat units are bonded along the molecular chain inthe same order but in different spatial arrangements.

stereoisomerism

A type of polymer chain configuration (stereoisomer)in which side groups regularly alternate positions onopposite sides of the chain.

syndiotactic

A copolymeric material thatexhibits elastomeric behavior yet is thermoplastic in nature.At the ambient temperature, domains of one repeat unit typeform at molecular chain ends that crystallize to act as physicalcrosslinks.

thermoplastic elastomer

. A semicrystalline polymeric materialthat softens when heated and hardens upon cooling. Whilein the softened state, articles may be formed by molding orextrusion.

thermoplastic (polymer)

A polymeric material that, once havingbeen cured (or hardened) by a chemical reaction, will notsoften or melt when subsequently heated.

thermosetting (polymer)

For polymers, a prefix denoting a type of molecularstructure. For some unsaturated carbon chain atoms withina repeat unit, a single side atom or group may be situated onone side of the double bond, or directly opposite at a 180_rotation position. In a trans structure, two such side groupswithin the same repeat unit reside on opposite sides (e.g.,trans-isoprene).

trans

Designating monomers that may react to formthree covalent bonds with other monomers.

trifunctional

Describes carbon atoms that participate in doubleor triple covalent bonds and, therefore, do not bond to a maximum of four other atoms.

unsaturated