Synthesis and characterization of sulfonated telechelic bisphenol A polycarbonate ionomers

Colonna, Martino; Berti, Corrado; Binassi, Enrico; Fiorini, Maurizio; Sullalti, Simone; Acquasanta, Francesco; Karanam, Sreepadaraj; Brunelle, Daniel J.

doi:10.1016/j.reactfunctpolym.2011.07.002

Cited by 21 publications

(16 citation statements)

References 9 publications

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“…In this way a d-spacing of 31 Å has been obtained Figure 3. We have previously reported [39] that the one-pot reaction of BMSC, BPA and SBENa does not produce telechelic ionomers since the reaction mixture remains opaque and the SBENa can be mainly recovered unreacted at the end of the polymerization process. In order to improve the reaction of BMSC with BPA we have adopted an approach similar to that used for telechelic PBT synthesis.…”

Section: Resultsmentioning

confidence: 99%

“…For this reason, BPA and 3% by mol of SBENa have been pre-reacted for 90 minutes at 210°C before the addition of BMSC. According to our previous work [39] a mixture of tetramethylammonium hydroxide and NaOH has been used as catalyst. The clay (3 wt% respect to the polymer) modified with a 1,3-di-hexadecylimidazolium salt (D-2AI) was added at the beginning of the pre-step.…”

Section: Resultsmentioning

confidence: 99%

“…A nanocomposite of PC without the presence of ionic groups was also synthesized (NC-2) along with a ionomer with 3% of ionic telechelic groups (I-1) and a standard polycarbonate (PC), always using BMSC as activated carbonate and the same polymerization procedure used for the in-situ polymerization of the nanocomposites. H-NMR analysis of the nanocomposites Figure 5 shows that no significant degradation reaction takes place, since no Fries by-products are detectable by NMR [39] and that the end-groups are mainly ionic.…”

Section: Resultsmentioning

confidence: 99%

“…The main reason of this insolubility can be ascribed to the cross-linking due to the formation of Fries rearrangement by-products due to the high temperature necessary for the polycondensation process. We have recently reported a novel melt method to produce telechelic sulfonated PC ionomers [39] with high ionic content, low degradation and good color, using BMSC in order to reduce the reaction temperature and the residence time. Regarding the clay modification, the general method to improve the compatibility the clay and the polymer consists in the modification of the clay with ammonium salts bearing long alkyl chains.…”

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Effect of telechelic ionic groups on the dispersion of organically modified clays in bisphenol A polycarbonate nanocomposites by in-situ polymerization using activated carbonates

Colonna¹,

Acquasanta²,

Gioia³

et al. 2017

Express Polym. Lett.

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Polymer layered nanocomposites (polymeric matrixes filled with particles that have one of their dimension in the nanometer range) [1,2] often have superior physical and mechanical properties over their microcomposites counterparts, including improved modulus [3], reduced gas permeability [4], increased flame retardantcy [5,6] and lower thermal expansion [7]. A considerable amount of the work in this area has been focused on polymeric nanocomposites containing layered silicates such as montmorillonite clay (MMT) [8][9][10]. A large number of papers have reported the preparation of well-exfoliated polymer/clay nanocomposites [9][10][11][12][13][14]. However, several problems have been encountered in the preparation of bisphenol A polycarbonate (PC) nanocomposites. For example, Paul [15] reports that only a small fraction of the clay platelets are exfoliated while the main part of the PC/clay composites has an intercalated morphology. The reason of this low degree of dispersion has been ascribed to the poor compatibility between the clay surface and the polymer. Moreover, the PC/clay composites prepared by melt blending of PC with montmorillonite modified with ammonium clays [15] are always dark colored and the molecular weight of the PC matrix consistently (30-40%) drops after extrusion. This issue has been ascribed to the use of ammonium salts for the modification of the clay (which are used in order to increase its compatibility of the clay with the polymer matrix).Indeed, ammonium modified clays are not stable in the standard polycondensation and processing conditions of PC that can exceed 300°C. Abstract. Nanocomposites of bisphenol A polycarbonate with organically modified clays have been prepared for the first time by in-situ polymerization using bis(methyl salicyl) carbonate as activated carbonate. The use of the activated carbonate permits to conduct the polymerization reaction at lower temperature and with shorter polymerization time with respect to those necessary for traditional melt methods that uses diphenyl carbonate, affording a nanocomposite with improved color. Moreover, an imidazolium salt with two long alkyl chains has been used to modify the montmorillonite, providing an organically modified clay with high thermal stability and wide d-spacing. The addition of ionic groups at the end of the polymer chain increases the interaction between the clay surface and the polymer producing a better dispersion of the clay. The presence of the clay increases the thermal stability of the polymer.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

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Effect of telechelic ionic groups on the dispersion of organically modified clays in bisphenol A polycarbonate nanocomposites by in-situ polymerization using activated carbonates

Colonna¹,

Acquasanta²,

Gioia³

et al. 2017

Express Polym. Lett.

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“…Moreover, since the diphenyl carbonate can react with both phthalic acids and resorcinol, two parallel reaction pathways can occur in this case. Therefore, the study of the reaction mechanism is crucial in order to obtain a polymer with the desired end-groups composition and properties [26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%