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Polymer engg > Lesson 6 > Flashcards

Lesson 6 Flashcards

1
Q

Polymerization process 2 primary categories

A

Homogeneous polyzn
Heterogeneous polyzn

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2
Q

Types of homogeneous polyzn

A

Bulk polymerization
Solution poly’zn

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3
Q

Polymerization from gaseous matter

A

Emulsion polymerization
Inverse emulsion system
Redox initiation

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4
Q

Other hetero liquid systems

A

Suspension polyzn
Precipitation polyzn
Solid-phase polyzn

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5
Q

Types of heterogeneous polyzn

A

Emulsion polyzn
Suspension polyzn
Inverse
Preciptation
Redox initiation
Solid-phase

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6
Q

Type of polyzn process that occurs in a single uniform phase

A

Homogeneous polyzn

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7
Q

Simplest tevhnique and gives a high purity of polymer

A

Bulk polyzn

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8
Q

Bulk polyzn only requires

A

Monomer
Initiator
Chain transfer agent

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9
Q

Autoacceleration or

A

Norris-Trommsdorff or gel effect

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10
Q

Formatiom of usually high MW because of the increased viscosity

A

Gel effect

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11
Q

The heat problem in bulk polyzn can be solved using

A

Solution polyzn

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12
Q

Polyzn that involves 2 or more phases

A

Heterogeneous polyzn

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13
Q

Heterogeneous reaxn media

A

Polyzn from gaseous monomer
Other heterogeneous liq systems

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14
Q

In emulsion polyzn there is ___ that consists of ___ and ___ that consists of ___

A

Aqueous continuous phase, initiator
Nonaqueous discontinuous phase, monomer and polymer

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15
Q

Emulsion polyzn uses ___ as a heat transfer agent

A

Water

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16
Q

In emulsion polyzn, polyzn starts when

A

Water-soluble initiating radicals enter the micelles with the monomers

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17
Q

Emulsion polyzn that uses aqueous soln of hydrophilic monomer in a continuous oil-phase using water-in-oil emulsifier

A

Inverse emulsion system

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18
Q

Initiator of inverse emulsion system can be

A

Oil-soluble
Water-soluble

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19
Q

Polyzn in an aqueous system with a water-insoluble monomer as dispersed phase

A

Suspension polyzn

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20
Q

Crucial process in the production of PP, PE, and olefins

A

Gas-phase polyzn

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21
Q

Widely used for the production of PE particularly HDPE in the petrochemical industry, under Gas-phase polyzn

A

Unipol process

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22
Q

Combination of gaseous ethylene and solid catalysts within FBR

A

Unipol process for PE

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23
Q

Process of forming surface films

A

Plasma polyzn

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24
Q

Process of depositing powdery particlrs formed in the gas phase

A

Deposition

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25
Prop of commercial processing
Hydrocarbom plastics and elastomers Other carbon chain polymers Heterochain thermoplastics
26
Hydrocarbon plastics and elastomers
Polyethylene Poplypropylene Olefins based rubber Natural rubber Rubber derived from butadiene Other synthetic elastomers
27
Good toughness and pliability, good resistance to acids
LDPE
28
Types of branchinh in LDPE
Intermolecular chain transfer Intramol chain trans
29
Creates long branches in types of branching in LDPE
Intermolecular chain transfer
30
Creates short chain branches in types of branching in LDPE
Intramolecular chain transfer
31
Polyethylene types
LDPE HDPE High and Ultra high MW PE Cross linked PE
32
High MW PE has a MW of
300,000-500,000
33
Ultra high MW PE has a MW of
3,000,000-6,000,000
34
Conversion of PE to thermosetting matl
Cross-linked PE
35
2 ways of cross linked PE
Chemical cross linking Radiation cross linking
36
Type of cross linking that uses stable peroxides
Chem CL
37
Type of cross linking that uses high energy electron irradiation
Radiation CL
38
PP can be made in 3 diff forms:
Isotactic, syndiotactic, atactic form
39
PP can be made in 3 diff forms, and this is the only form that crystallizes effectively
Isotactic
40
Other olefin based polymers and copoly
Olefin based plastics Polymers of higher olefins Olefin based rubber
41
____ is used for most olefin based plastics
Coordination polymerization
42
Polymers of higher olefins
Isotactic polybutene-1 Polymethyl pentene (PMP) Linear Low Density (LLD) Ionomers
43
Generic term for thermoplastic that contains ionizable carboxyl grps
Ionomers
44
Olefin based rubbers
Chlorosulfonated PE Ethylene-PP Rubbers
45
Source of natural rubber
Hevea brasiliensis tree
46
Extracted from latex
Rubber
47
2 methods of latex
Crepe rubber, smoked sheet
48
Adding amount of sodium bisulfate in latex
Crepe rubber
49
Does not use bleaching agent in latex
Smoked sheet
50
Subjecting rubber to severe mechanical working which softens and weakens the rubber
Mastification
51
Natural rubber and other polyisoprene
Natural rubber Stereoregular synthetic polyisoprene
52
Isoprene + solvent = ?
Stereoregular synthetic polyisoprene
53
Can fully substitute natural rubber
Stereoregular synthetic polyisoprene
54
Rubbers derived from butadiene
Styrene-butadiene rubber Nitric rubber Stereoregular polybutadienes
55
Rubber that has a key prop of oil resistance
Nitric rubber
56
Also called as cold rubber
Styrene butadiene rubber
57
Blended with SBR and natural rubber
Stereopolybutadiene
58
Other synthetic elastomers
Polyisobutylene and butyl rubber Polychloroprene (Neoprene) Thermoplastic elastomers
59
Polychloroprene aka
Neoprene
60
Copolymer of isobutylene with isopropene for vulcanization
Butyl rubber
61
1st synthetic rubber in the US
Polychloroprene (neoprene)
62
Replacement for specialty rubbers
Thermoplastic elastomers
63
Types of thermoplastic elastomers
Block Polyurethanes Copolymers Blends of ethylene PP copolymers with PP
64
Other carbon chain poly
PS and related polymers Acrylic polymers Polyvinyl esters and derived polymers Cl containing polymers F containing polymers
65
Copolymer of styrenes
1. Butadiene copolymers 2. Heat and impact resistance 3. Ion exchange resins 4. Polymer of styrene derivatives 5. Rubber modified PS 6. ABS resins 7. PS Foams
66
3 stages of bulk poly
Prepolyzn Main polyzn Product collection
67
Product collection for fibers and rods
Spinnerets Extrusion
68
Most important of all copolymers in terms of vol
SB synthetic rubber
69
Rubber modified PS 2 approaches
Mechanical blends Grafted rubber
70
Rubber particles dispersed in PS matrix
Mechanical blends
71
Rubber particles chemically bonded to PS
Grafted rubber
72
Acrylic polymers
Poly methyl methacrylate Higher methacrylate
73
Method for preparing higher alkyl methacrylates from MM
Alcoholysis
74
Polyvinyl esters and derived polymers
Polyvinyl acetate PV alcohol PV acetals
75
Elmers glue is from
PV acetate
76
Alcoholysis of PV acetate
PV alcohol
77
PV acetals aka
PV butyral
78
"The vinyls" or "vinyl resins"
Cl cobtaining polymrrs
79
Partially syndiotactic matl with suff irreg of struc that crystallinity is quite low
PVC
80
Cl containing poly
PVC Vinyl resins
81
F containing poly
PTFE PolychlorotriFE PV fluoride PVidene fluoride
82
Precursor for PV alcphol and PV acetals
PV acetate
83
Fraser 3 major classes kf inorganic poly
Organic-inorganic Metal chelate poly Completely inorganic linear poly

Polymer engg (2 decks)

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