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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
Q

Prop of commercial processing

A

Hydrocarbom plastics and elastomers
Other carbon chain polymers
Heterochain thermoplastics

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26
Q

Hydrocarbon plastics and elastomers

A

Polyethylene
Poplypropylene
Olefins based rubber
Natural rubber
Rubber derived from butadiene
Other synthetic elastomers

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27
Q

Good toughness and pliability, good resistance to acids

A

LDPE

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28
Q

Types of branchinh in LDPE

A

Intermolecular chain transfer
Intramol chain trans

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29
Q

Creates long branches in types of branching in LDPE

A

Intermolecular chain transfer

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30
Q

Creates short chain branches in types of branching in LDPE

A

Intramolecular chain transfer

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31
Q

Polyethylene types

A

LDPE
HDPE
High and Ultra high MW PE
Cross linked PE

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32
Q

High MW PE has a MW of

A

300,000-500,000

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33
Q

Ultra high MW PE has a MW of

A

3,000,000-6,000,000

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34
Q

Conversion of PE to thermosetting matl

A

Cross-linked PE

35
Q

2 ways of cross linked PE

A

Chemical cross linking
Radiation cross linking

36
Q

Type of cross linking that uses stable peroxides

A

Chem CL

37
Q

Type of cross linking that uses high energy electron irradiation

A

Radiation CL

38
Q

PP can be made in 3 diff forms:

A

Isotactic, syndiotactic, atactic form

39
Q

PP can be made in 3 diff forms, and this is the only form that crystallizes effectively

A

Isotactic

40
Q

Other olefin based polymers and copoly

A

Olefin based plastics
Polymers of higher olefins
Olefin based rubber

41
Q

____ is used for most olefin based plastics

A

Coordination polymerization

42
Q

Polymers of higher olefins

A

Isotactic polybutene-1
Polymethyl pentene (PMP)
Linear Low Density (LLD)
Ionomers

43
Q

Generic term for thermoplastic that contains ionizable carboxyl grps

A

Ionomers

44
Q

Olefin based rubbers

A

Chlorosulfonated PE
Ethylene-PP Rubbers

45
Q

Source of natural rubber

A

Hevea brasiliensis tree

46
Q

Extracted from latex

A

Rubber

47
Q

2 methods of latex

A

Crepe rubber, smoked sheet

48
Q

Adding amount of sodium bisulfate in latex

A

Crepe rubber

49
Q

Does not use bleaching agent in latex

A

Smoked sheet

50
Q

Subjecting rubber to severe mechanical working which softens and weakens the rubber

A

Mastification

51
Q

Natural rubber and other polyisoprene

A

Natural rubber
Stereoregular synthetic polyisoprene

52
Q

Isoprene + solvent = ?

A

Stereoregular synthetic polyisoprene

53
Q

Can fully substitute natural rubber

A

Stereoregular synthetic polyisoprene

54
Q

Rubbers derived from butadiene

A

Styrene-butadiene rubber
Nitric rubber
Stereoregular polybutadienes

55
Q

Rubber that has a key prop of oil resistance

A

Nitric rubber

56
Q

Also called as cold rubber

A

Styrene butadiene rubber

57
Q

Blended with SBR and natural rubber

A

Stereopolybutadiene

58
Q

Other synthetic elastomers

A

Polyisobutylene and butyl rubber
Polychloroprene (Neoprene)
Thermoplastic elastomers

59
Q

Polychloroprene aka

A

Neoprene

60
Q

Copolymer of isobutylene with isopropene for vulcanization

A

Butyl rubber

61
Q

1st synthetic rubber in the US

A

Polychloroprene (neoprene)

62
Q

Replacement for specialty rubbers

A

Thermoplastic elastomers

63
Q

Types of thermoplastic elastomers

A

Block
Polyurethanes
Copolymers
Blends of ethylene PP copolymers with PP

64
Q

Other carbon chain poly

A

PS and related polymers
Acrylic polymers
Polyvinyl esters and derived polymers
Cl containing polymers
F containing polymers

65
Q

Copolymer of styrenes

A
  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
Q

3 stages of bulk poly

A

Prepolyzn
Main polyzn
Product collection

67
Q

Product collection for fibers and rods

A

Spinnerets
Extrusion

68
Q

Most important of all copolymers in terms of vol

A

SB synthetic rubber

69
Q

Rubber modified PS 2 approaches

A

Mechanical blends
Grafted rubber

70
Q

Rubber particles dispersed in PS matrix

A

Mechanical blends

71
Q

Rubber particles chemically bonded to PS

A

Grafted rubber

72
Q

Acrylic polymers

A

Poly methyl methacrylate
Higher methacrylate

73
Q

Method for preparing higher alkyl methacrylates from MM

A

Alcoholysis

74
Q

Polyvinyl esters and derived polymers

A

Polyvinyl acetate
PV alcohol
PV acetals

75
Q

Elmers glue is from

A

PV acetate

76
Q

Alcoholysis of PV acetate

A

PV alcohol

77
Q

PV acetals aka

A

PV butyral

78
Q

“The vinyls” or “vinyl resins”

A

Cl cobtaining polymrrs

79
Q

Partially syndiotactic matl with suff irreg of struc that crystallinity is quite low

A

PVC

80
Q

Cl containing poly

A

PVC
Vinyl resins

81
Q

F containing poly

A

PTFE
PolychlorotriFE
PV fluoride
PVidene fluoride

82
Q

Precursor for PV alcphol and PV acetals

A

PV acetate

83
Q

Fraser 3 major classes kf inorganic poly

A

Organic-inorganic
Metal chelate poly
Completely inorganic linear poly

Polymer engg (2 decks)

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