Investigation of PMMA/polyoxide blends containing graft-copolymer compatibilizers by using NMR, SEM, and thermal analysis

Amorim, Marcel Álvaro de; Oliveira, Clara Marize F.; Tavares, Maria Inês B.

doi:10.1002/(sici)1097-4628(19960926)61:13<2245::aid-app1>3.0.co;2-c

Cited by 15 publications

(3 citation statements)

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“…In recent years, great attention was paid to graft copolymers, because of their unique molecular architecture, particular morphology and increased number of applications. − They have been widely used for the preparation of compatibilizers for polymer blends, − membranes for separation of gases or liquids, − hydrogels, drug deliverers, thermoplastic elastomers, etc. A number of methods have been employed for their synthesis, such as the macromonomer method, − radiation-induced polymerization, − ring-opening olefin methathesis polymerization, polycondensation reaction and iniferter-induced polymerization .…”

Section: Introductionmentioning

confidence: 99%

Graft Copolymers by Combined Anionic and Cationic Polymerizations Based on the Homopolymerization of a Bifunctional Monomer

Zhang¹,

Ruckenstein²

1998

Macromolecules

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The bifunctional monomer 2-(vinyloxy)ethyl methacrylate (VEMA) was polymerized both anionically and cationically. Using 1,1-diphenylhexyllithium (DPHL) as initiator, tetrahydrofuran (THF) as solvent and the low temperature of −60 °C, the CC double bond of the methacryloyl group of VEMA underwent smoothly anionic polymerization, without cross-linking or side reactions. The polymer had a controlled molecular weight and a narrow molecular weight distribution (M w/M n = 1.06−1.12). On the other hand, the CC double bond of the vinyloxy group of VEMA can undergo cationic polymerization. A polymer with controlled molecular weight and narrow molecular weight distribution (M w/M n = 1.11−1.13) was prepared using 2-[1-acetoxyethoxy]ethyl methacrylate (4)/EtAlCl2 as initiator in the presence of THF, a weak Lewis base. Two methods were employed to prepare graft copolymers. (A) The anionically prepared polymer of VEMA was separated from solution after quenching the polymerization and purified by freeze-drying; then the vinyloxy groups of the side chains were allowed to react with trifluoroacetic acid to generate a macroinitiator, which finally induced the cationic graft polymerization of isobutyl vinyl ether (IBVE). This procedure yielded a graft copolymer with a polymethacrylate backbone and poly(IBVE) side chains containing a small amount of the IBVE homopolymer. (B) The anionic polymerization of 4 was carried out in THF without quenching, to produce a solution of macroinitiator. Then, in contrast to the first method, the polymer was not separated and toluene and IBVE were introduced into the system. Further, the cationic graft polymerization of IBVE was induced by adding an activator (EtAlCl2). The THF, which was used as solvent in the anionic polymerization of 4, acted as a Lewis base in the cationic polymerization step. This procedure yielded a pure graft copolymer with controlled molecular weight and narrow molecular weight distribution (M w/M n = 1.15−1.17), consisting of a polymethacrylate backbone and poly(IBVE) side chains.

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Section: Introductionmentioning

confidence: 99%

Graft Copolymers by Combined Anionic and Cationic Polymerizations Based on the Homopolymerization of a Bifunctional Monomer

Zhang¹,

Ruckenstein²

1998

Macromolecules

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“…The moderate levels of ionic conductivity reported for SPEs based on commercial PEO are still considered inadequate for many electrochemical applications, however the advantages they offer as solid-state components, their thermal, electrochemical and physical stability and their potential as multi-functional components in devices, continue to provide motivation for further development (1,2). Many different approaches have been used to improve the properties of PEO-based electrolytes by modifying network architecture (3)(4)(5)(6)(7)(8)(9). Poly(trimethylene carbonate), designated as pTMC, is a high molecular weight amorphous elastomer with a T g close to room temperature (-18ºC) with excellent mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Interpenetrating Networks Based on Poly(trimethylene Carbonate) and Poly(ethylene oxide) Blends Doped With Lithium Salts

et al. 2009

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Solid polymer electrolytes based on poly(trimethylene carbonate) and poly(ethylene oxide) interpenetrating networks doped with lithium hexafluoroantimonate have been prepared and characterized by measurements of ionic conductivity, cyclic voltammetry, differential scanning calorimetry and thermogravimetry. Electrolytes with lithium salt compositions of n between 5 and 15 (where n represents the total number of cation-coordinating units per lithium ion) and a host polymer component of -(O=COCH2CH2CH2O)n- units contributing between 5 and 15 wt% of the electrolyte formulation, were prepared by co-dissolution in acetonitrile. The solvent casting technique was used to produce flexible, transparent and free-standing films.

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“…However, no such studies on this system have been reported, but many blends of PET with HDPE [6,7], ABS [8], PS [5], and PA [9,10] were studied in the past for the improvement in impact and modulus. Blends of PMMA with PP [11], PEO [12], and natural rubber [13] showed improvement in the impact strength. Both the polymers are transparent and polar; PET has the ester repeat unit in the backbone while PMMA has the ester repeat unit in the side chain.…”

Section: Introductionmentioning

confidence: 99%

Amphiphilic block copolymers of PtBA‐b‐PMMA as compatibilizers for blends of PET and PMMA

Dewangan

Jagtap

2006

Polymer Engineering & Sci

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PET and PMMA were blended at various weight fractions. These blends were compatibilized by employing amphiphilic block copolymers of PtBA-b-PMMA, having three compositions (1:3, 1:1, 3:1) and three weight fractions (3, 5, and 7 wt%) using a co-rotating twin screw extruder. The blends were evaluated for their mechanical, rheological, and morphological properties. Overall, the compatiblized blends showed improvement in properties compared with the properties of noncompatiblized blends. Mechanical properties of the compatibilized blends improved with an increase in the PMMA and compatibilizer weight fractions. It was observed that the compatibilizer with lower molecular weight and lower glass transition temperature, typically at 5 wt%, provided the overall best properties. POLYM. ENG. SCI., 46: 1147-1152, 2006.

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Investigation of PMMA/polyoxide blends containing graft-copolymer compatibilizers by using NMR, SEM, and thermal analysis

Cited by 15 publications

References 1 publication

Graft Copolymers by Combined Anionic and Cationic Polymerizations Based on the Homopolymerization of a Bifunctional Monomer

Graft Copolymers by Combined Anionic and Cationic Polymerizations Based on the Homopolymerization of a Bifunctional Monomer

Interpenetrating Networks Based on Poly(trimethylene Carbonate) and Poly(ethylene oxide) Blends Doped With Lithium Salts

Amphiphilic block copolymers of PtBA‐b‐PMMA as compatibilizers for blends of PET and PMMA

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