Transitions and Relaxations in Cis Polypentenamer and Its Hydrogenated Derivatives

Earnest, T. R.; MacKnight, W. J.

doi:10.1021/ma60055a041

Cited by 13 publications

(5 citation statements)

References 6 publications

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“…8 It should be noted that the ␤-process in PE is traced to the completely amorphous fraction by eliminating crystallinity through copolymerization. 24,25 Activation energy ⌬H ϭ 27 Ϯ 1 kJ mol Ϫ1 for the amorphous process in iPP is similar to the values ⌬H ϭ 31 Ϯ 13 kJ mol Ϫ1 and ⌬H ϭ 40 Ϯ 17 kJ mol Ϫ1 obtained previously by using the TC model. 11,13 In the articles mentioned, this process has been connected to restricted amorphous fraction of iPP samples and treated as an ␣-transition.…”

Section: Resultssupporting

confidence: 84%

Viscoelastic behavior of semicrystalline polymers at elevated temperatures on the basis of a two-process model for stress relaxation

Djoković

Kostoski

Dramićanin

2000

J. Polym. Sci. B Polym. Phys.

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Section: Resultssupporting

confidence: 84%

Viscoelastic behavior of semicrystalline polymers at elevated temperatures on the basis of a two-process model for stress relaxation

Djoković

Kostoski

Dramićanin

2000

J. Polym. Sci. B Polym. Phys.

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“…7,8 The glass transition temperatures of various ionomer systems (e.g., silicates, phosphonate, acrylate, ethylene ionomers, and styrene ionomers) were studied extensively. [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26] Especially, the glass transition temperatures of ethyl acrylate ionomers as a function of ion content were investigated by Matsuura and Eisenberg. 14 Using a differential scanning calorimetry (DSC) technique, they found sigmoid curves in the T g vs ion content plots.…”

Section: Introductionmentioning

confidence: 99%

Relationships between the Glass Transition Temperatures and the Type of Cations in Poly(ethyl acrylate) Ionomers

Kim

2003

Macromolecules

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Glass transition temperatures of poly(ethyl acrylate) ionomers neutralized with various cations were studied dynamic mechanically in terms of ion content and the type of cations. On one hand, it was found that with increasing ion content the matrix T gs increased linearly and identically regardless of the variety of cations. Thus, it is inferred that the type of cations did not affect the matrix Tgs. On the other hand, in the plots of the cluster Tgs vs (ion content × charge)/(distance between charges), it was observed that the cluster Tgs were superimposed on the straight line. This result implies that the cluster Tg involving ion hopping is affected by the type of cations. It was also found that the ionic modulus did not change with the type of cations significantly. In addition, the small-angle X-ray study showed that with increasing the radius of a cation the distance between scattering centers increased. Thus, it was postulated that the restricted mobility layer became thicker slightly with the increasing size of a cation.

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“…a RELAXATION. The a relaxation in polyethylene ( 19), hydrogenated PP' s ( 20,21 ) , and ethylene-based copolymers ( 22) is found to depend on the presence of polyethylene crystals. This relaxation generally is accepted as being composite in nature, arising from both an interlamellar slip process ( 23,24) and intracrystalline motion involving the simultaneous rotation and translation of chains within the crystal (25).…”

Section: Discussionmentioning

confidence: 99%

“…'Y RELAXATION. The previous publications on hydrogenated PP's (20,21) and their derivatives bearing pendant ionic groups ( 3,4,36) all have concluded that the 'Y relaxation is a secondary relaxation of composite nature, involving both an amorphous and crystalline component. The results of this investigation suggest no reason to disagree with these conclusions.…”

Section: Hydrogenatedmentioning

confidence: 99%

Thermal, Dynamic Mechanical, and Dielectric Properties of Hydrogenated, Sulfonated Polypentenamers

Rahrig

Knight

1980

Advances in Chemistry

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Hydrogenated, sulfonated polypentenamers containing from 2.9 to 19.l mol % pendant groups in the form of sodium salts were examined by differential scanning calorimetry (DSC) and dynamic mechanical and dielectric relaxation techniques. DSC results display two endotherms and provide evidence of a room-temperature annealing phenomenon. Four relaxations, a, {3, y, and y, in order of decreasing temperature, are observed dynamic mechanically. The a relaxation is composite in origin but appears to arise partially from an ionic-phase mechanism which suggests the existence of ionic clusters. The {3 relaxation is related to the glass transition and is affected by the crystalline content.• Large increases in l and tan 8. accompany the dielectric results. A dielectric a relaxation displays behavior that parallels that of the mechanical a peak. w e have reported previously the sulfonation of a polypentenamer (PP) under reaction conditions that preclude the formation of covalent cross-links (1). The sulfonated materials are isolated in the form of sodium salts to give ion-containing elastomers. The thermal and dynamic mechanical properties of the sulfonated PP's indicate the existence of phase-separated ionic clusters above a sulfonate concentration of roughly 10 mol % (2). It has been shown (1) that the unsaturation in the sulfonated PP' s can be removed by a diimide hydrogenation reaction to yield a material that is essentially linear polyethylene with pendant sulfonate groups. In this manner the effect of backbone crystallinity on

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Transitions and Relaxations in Cis Polypentenamer and Its Hydrogenated Derivatives

Cited by 13 publications

References 6 publications

Viscoelastic behavior of semicrystalline polymers at elevated temperatures on the basis of a two-process model for stress relaxation

Viscoelastic behavior of semicrystalline polymers at elevated temperatures on the basis of a two-process model for stress relaxation

Relationships between the Glass Transition Temperatures and the Type of Cations in Poly(ethyl acrylate) Ionomers

Thermal, Dynamic Mechanical, and Dielectric Properties of Hydrogenated, Sulfonated Polypentenamers

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