Viscoelasticity of Potassium Neutralized Telechelic Poly(ethylene-butylene) Ionomer in Non-polar Solvent

Rahman, Syed Atiqur; Takada, Akihiko; Nemoto, Norio

doi:10.1678/rheology.30.95

Cited by 8 publications

(5 citation statements)

References 26 publications

(25 reference statements)

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“…Total increase in η for CTPEB-Ester solutions from C = 1 to 100 wt% is found to be around 3 orders of magnitude, which is attributable to an increase in the segmental friction coefficient with increasing C. As mentioned elsewhere, 40) CTPEB-Ester chains are not entangled even in the bulk state.…”

Section: Viscosity Behavior Above C = 1 Wt%supporting

confidence: 58%

“…CTPEB-Ester was prepared as ethyl carboxylate with the acylchloride method as described elswhere. 40) CTPEB-Al was prepared by complete neutralization of dried CTPEB with stoichiometric amount of aluminium ethoxide. Prescribed amounts of CTPEB and aluminium ethoxide were dissolved in toluene and in a mixture of thionyl chloride and tetrahydrofuran (THF) with a ratio of 5 to 1, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…In previous reports, 40), 41) we studied in detail the viscoelasticity of potassium and magnesium neutralized telechelic poly (ethylene butylene) ionomers (CTPEB-K and CTPEB-Mg) in a nonpolar solvent of decalin and also in bulk. For CTPEB-K we found that the chains are associated with each other in a pairwise manner by association of ionic groups at chain ends so as to form linear chain-like aggregates even in the very dilution limit.…”

Section: Introductionmentioning

confidence: 99%

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Viscoelasticity of Aluminium Neutralized Telechelic Poly(ethylene butylene) Ionomer

Rahman

Nemoto

2003

J. Soc. Rheol., Jpn

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The associative and mechanical properties of aluminium neutralized telechelic poly(ethylene butylene) ionomer, CTPEB-Al, in a nonpolar solvent of decalin were studied from very dilute solution up to the bulk with rheological methods and IR spectroscopy. Dilute solution viscometry revealed that CTPEB-Al molecules are associated in very dilute solution as their smallest associating structural unit made of three CTPEB chains and two aluminium tricarboxylate bonds [(COO − ) 3 Al 3+ : ATC bond]. These smallest associating units are further associated into larger aggregates with increasing polymer concentration C and form viscoelastic networks above C=7 wt%. The viscoelasticity and IR data reveal that in the low concentration range from 7 wt% to 12 wt%, CTPEB-Al chains are associated with each other in such a way that they form pretty long network strands with or without branches as dangling chains that act as elastically effective chains as a whole. In the networks with C ≥ 70 wt%, however, most of the ATC bonds and ion clusters act as effective crosslinking points so that almost 90% chains become elastically effective in the bulk state.

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Section: Viscosity Behavior Above C = 1 Wt%supporting

confidence: 58%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Viscoelasticity of Aluminium Neutralized Telechelic Poly(ethylene butylene) Ionomer

Rahman

Nemoto

2003

J. Soc. Rheol., Jpn

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“…The CTPEB used is the same one as previous works; [3][4][5][6][7][8] nominal molecular weight: 1400, and the ratio of ethylene and from FT-IR and viscoelastic measurements that there is no difference between them so that the data only for the melt blended sample are reported below. In this study, mixing ratio of CTPEB/ODA is denoted by mole ratio of -NH 2 and -COOH, assuming that CTPEB is 100 % telechelic.…”

Section: Methodsmentioning

confidence: 99%

Thermo-Reversible Solid-Like and Liquid-Like Behaviors of Carboxyl-Terminated Telechelic Poly(ethylene-butylene) Neutralized by Octadecylamine

Takada

Saeki

Murata

et al. 2014

J. Soc. Rheol., Jpn

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INTRDUCTIONTelechelic polymer is a kind of linear polymers which has functional groups at the both chain ends. One of the unique characteristics of telechelic polymers is that they can be used . Note that it is necessary to remove byproduct (e.g. acetic acid) from the system to prepare the ionomer samples. For these ionomers, rather broad plateau region are observed in dynamic mechanical analysis, implying that network structure is formed. Solid-like and liquid-like viscoelastic behaviors at low and high temperature, T, respectively, observed for carboxylterminated telechelic poly(ethyrene-butylene) (CTPEB) neutralized with octadecylamine ODA prepared by melt mixing are studied in relation with the structure examined by XRD, FT-IR, DSC and small angle neutron scattering. When the mole ratio of -NH 2 and -COOH, NH 2 /COOH in CTPEB/ODA is 1.4 or higher, CTPEB/ODA was solid-like at 298K, while it was liquid-like having almost the same viscosity as CTPEB at 343K. The network structure formed at low T was easily fractured by small strain and cannot be reformed at low T. However, when the sample is annealed at 353K, cooled and kept for a few hours at T < 300K, the solid-like behavior is reproduced. It was concluded that the network formation at low T and its disappearance at high T for CTPEB/ODA is caused by non-crystalline association/ dissociation of C18 residues in ODA connected to CTPEB by ionic bond (NH 3 + COO -). Due to the small M w of CTPEB, only longer chains (~ 1/3 of total chains) connected to ODA aggregates form network structure and sustain the constant G' in this system at low T.

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“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] It seems well established that telechelic ionomers are aggregated even at very dilute concentration in anhydrous solvent, grow in aggregate size with increasing polymer concentration C and then form weak viscoelastic networks at certain C Ã depending on a kind of metallic ions used followed by development of stronger networks with ion clusters as crosslinking points up to the bulk. Here, adjectives ''weak'' and ''strong'' are only conventionally used to differentiate two networks with that there are large differences in magnitudes of viscosity and plateau modulus characteristic of the viscoelastic network.…”

mentioning

confidence: 99%

Viscoelasticity of Potassium Neutralized Telechelic Poly(ethylene–butylene) Ionomer in Non-polar Solvent. II

Rahman

Nemoto

2004

Polym J

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ABSTRACT:Dynamic viscoelastic measurements are made on six potassium neutralized telechelic poly(ethylene butylene) ionomer (CTPEB-K) solutions in anhydrous decalin with C from 7 to 70 wt % as well as the bulk sample for establishing viscoelastic properties of this system along with earlier data over the whole concentration range. Differences in the formation process of viscoelastic networks and their structures between the two ionomeric systems of CTPEB-K and -Mg are extensively discussed using concentration dependencies of viscosity and the number density of the elastically effective chains and also the temperature dependence of the shift factor obtained from the time-temperature reduction scheme. [DOI 10.1295/polymj.36.817] KEY WORDS Dynamic Viscoelasticity / CTPEB-K / Network Relaxation / Ion Clusters / Telechelic ionomers containing ionic groups only at both chain ends are useful for studying details of association processes induced by metallic ions as a model system and many fruitful results have been obtained.1-17 It seems well established that telechelic ionomers are aggregated even at very dilute concentration in anhydrous solvent, grow in aggregate size with increasing polymer concentration C and then form weak viscoelastic networks at certain C Ã depending on a kind of metallic ions used followed by development of stronger networks with ion clusters as crosslinking points up to the bulk. Here, adjectives ''weak'' and ''strong'' are only conventionally used to differentiate two networks with that there are large differences in magnitudes of viscosity and plateau modulus characteristic of the viscoelastic network.In a previous report, 18 we studied in detail viscosity and dynamic viscoelastic behaviors of magnesium neutralized telechelic poly(ethylene butylene) ionomers (CTPEB-Mg) in a nonpolar solvent of decalin from very dilute solution up to the bulk. We found that CTPEB-Mg chains are associated as ring polymers in very dilute decalin solution forming a -COO À Mg 2þÀ OOC-ionic bond (MDC bond) due to the divalent nature of Mg 2þ cation, i.e., due to the restriction that the electrically neutral condition must be satisfied. Using the dilute polymer solution theory, 19,20 we found that about five CTPEB-Mg chains are associated to each other to form one ring, and with further increase in C these rings are linearly associated to each other so as to form huge polymeric clusters of various sizes. A weak viscoelastic network is formed near the overlapping concentration C Ã of the system estimated from the intrinsic viscosity value. The network becomes stronger forming ion clusters in such a way that ion clusters are mainly made of two MDC bonds up to C ¼ 30 wt % and then larger and thermodynamically more stable ion clusters are formed above C ¼ 50 wt %.When monovalent cation K þ is used for stoichiometric neutralization of CTPEB, an ion pair of COO À K þ is allowed to be present as a strong dipole in decalin at each chain end, since the electrically neutral condition is satisfied. However, pairwise associa...

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Viscoelasticity of Potassium Neutralized Telechelic Poly(ethylene-butylene) Ionomer in Non-polar Solvent

Cited by 8 publications

References 26 publications

Viscoelasticity of Aluminium Neutralized Telechelic Poly(ethylene butylene) Ionomer

Viscoelasticity of Aluminium Neutralized Telechelic Poly(ethylene butylene) Ionomer

Thermo-Reversible Solid-Like and Liquid-Like Behaviors of Carboxyl-Terminated Telechelic Poly(ethylene-butylene) Neutralized by Octadecylamine

Viscoelasticity of Potassium Neutralized Telechelic Poly(ethylene–butylene) Ionomer in Non-polar Solvent. II

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