Thermal properties of ethylene/propylene copolymers

Clegg, G. A.; Gee, D. R.; Melia, Tom

doi:10.1002/macp.1968.021160113

Cited by 12 publications

(4 citation statements)

References 14 publications

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“…In the meantime, we have established a data bank of heat capacities of linear macromolecules.11 For polyethylene, data on more than 100 samples have presently been collected.12 In addition, there are quantitative data on amorphous copolymers of ethylene and propylene. 13 In this note we would like to update our earlier conclusions of the glass transition making use of information of the data bank12 and other supporting information.6•14 This will be followed by a discussion of the argument of Beatty and Karasz.1 Last, new experiments by Hendra et al 15 and Breedon Jones et al16 on completely amorphous polyethylene, which crystallizes between 145 and 170 K, will be shown to yield more insight into the motion in polyethylene.…”

mentioning

confidence: 97%

The Glass Transition Temperature of Polyethylene

Gaur¹,

Wunderlich²

1980

Macromolecules

129

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mentioning

confidence: 97%

The Glass Transition Temperature of Polyethylene

Gaur¹,

Wunderlich²

1980

Macromolecules

129

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“…Still, the agreement is excellent. As was noticed already by Clegg et al [19] the tacticity and positioning of the CHCH 3-seems to play little role. The heat capacities are well reproduced by the addition scheme.…”

Section: Comparison Of the Addition Scheme With Measurementsmentioning

confidence: 62%

“…Clegg et al [19] measured heat capacities of eight poly(ethylene-co-propylenes). Of these, two were analyzed by adiabatic calorimetry in the solid region from 80 to 180 K. Above 180 K the influence of the glass transition is noticeable.…”

Section: Comparison Of the Addition Scheme With Measurementsmentioning

confidence: 99%

An addition scheme of heat capacities of linear macromolecules. Carbon backbone polymers

Gaur

Cao

Pan

et al. 1986

Journal of Thermal Analysis

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It is shown that heat capacities of linear macromolecules consisting of all-carbon singlebonded backbones can be calculated from the appropriate contributions of substituted carbon atoms to a precision of about -0.2 + 2.5 % (155 data points), which is similar to the experimental precision. Heat capacity contributions of 42 groups are given over the full range of measurement and reasonable extrapolation. The quality of the addition scheme is tested on 16 series of measurements on homopolymers, copolymers and blends. The addition scheme works for all these different states of aggregation of the constituent groups. The basis of the addition scheme is discussed.The possible additivity of heat capacities of different constituents of linear macromolecules has been a topic of long standing interest in our laboratory. A first attempt to establish an addition scheme was published in 1969 [1]. Based on literature data on 30 polymers, it could be shown at that time that from 60 K to the glass transition temperature additivity seemed to exist with an accuracy of 4-5%. In the meantime, our collection of heat capacities of polymers has grown into the ATHAS Data Bank with data on about 100 polymers [2], During the collection of the data bank it became clear that even polymer melts may show additivity [3]. Of particular interest was that copolymer heat capacities could be generated from the heat capacities of the homopolymer constituents [1]. Heat capacities of multiphase polymers, such as partially crystallized polymers [4] and phase separated block copolymers [5] and blends [6] could also be analyzed by comparison with heat capacities derived from additivity of the components [7]. Even the increase in heat capacity at the glass transition was found to be additive and empirically predictable in terms of the rigid atomic groupings, "beads", in the macromolecule [8].

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“…The work described in this paper is a continuation of our investigations [1][2][3][4] of the thermal properties of copolymers formed between ethylene and cr-olefines. The compound studied is a block copolymer of ethylene and 1-butene.…”

Section: Introductionmentioning

confidence: 84%

Thermal properties of an ethylene/1‐butene block copolymer

1970

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A precision, adiabatic vacuum calorimeter and a differential scanning calorimeter have been used to measure the heat capacity of an ethylene/l-butene block copolymer over the temperature range80-450'K. An estimate has been made of heat capacity values below 80'K. Values of the heat capacity, entropy, enthalpy, and free energy are listed at lO'K intervals. A glass transition (200°K), a transition of unknown origin (33SnK) and a melting transition (400OK) were observed. ZUSAMMENFASSUNG:Die Warmekapazitat eines Athylen/Buten-(1)Xopolymeren wurde zwischen 80 und 450 O K mit Hilfe eines adiabatischen Prazisionsvakuumcalorimeters und eines Differentialkalorimeters gemessen. Fur Temperaturen unterhalb 80°K wurde die Warmekapazitat naherungsweise durch ein Extrapolationsverfahren berechnet. Aus den Messungen wurden die Entropie-, die Enthalpie-und die freien Energiewerte ermittelt; sie werden in Intervallen von 10 Grad angegeben. Ein Einfriervorgang (200°K), eine Umwandlung unbekannten Ursprungs (335 OK) und eine Schmelzumwandlung (400OK) wurden beobachtet.

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Thermal properties of ethylene/propylene copolymers

Cited by 12 publications

References 14 publications

The Glass Transition Temperature of Polyethylene

The Glass Transition Temperature of Polyethylene

An addition scheme of heat capacities of linear macromolecules. Carbon backbone polymers

Thermal properties of an ethylene/1‐butene block copolymer

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