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3.034 Quiz #1

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Polymers

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Terms in this set (43)

high molecular weight molecules comprised of many similar building blocks. Intra- and inter chain interactions produce a diverse collection of molecular arrangements, higher order structures and properties

any substance that can be converted into a polymer

structural unit

basic building block of a polymer. Each sis derived from a monomer. In some cases, this and the monomer have the same molecular weight, in other cases, this is not true

a structural unit or combination of structural units that repeats along a polymer chain

parameters of interest

chain architecture, molecular weight and molecular weight distribution, isomer state. think about how these parameters influence properties and how they might be controlled through chemistry

comprised of one structural unit or repeat unit

comprised of more than one structural unit or combination of structural units. Note when two different monomers are needed to create a chain, the resultant polymer is considered a homopolymer

chain architecture examples

linear, branched, star, dendrimer

chemical crosslinks

covalent linkages between chains - fully crosslinked polymers are insoluble and infusible

polydispersity index

pdi = mw/mn (weight average mol weight over number average), provides indication of breadth of molecular weight distribution

molecules with same number and types of atoms but with distinguishably different structures

constitutional isomers

same empirical formula but different structural formula (different connectivity of atoms) (positional isomers, head-to-head and head-to-tail isomers)

same structural formula but different spatial arrangement of atoms (configurational and conformational)

configurational isomers

can only be interconverted by breaking bonds

cis/trans geometric isomers

different arrangement of atoms about a double bond