Morphology of poly[(t-butyl acrylate)-b-styrene-b-isobutylene-b-styrene-b-(t-butyl acrylate)] pentablock terpolymers and their thermal conversion to the acrylic acid form
“…The peaks at 13.7, 19.0, 30.4, and 63.8 ppm caused by the carbons of CH 3 and CH 2 (l, k, j, i) (Wyzgoski et al 2004) appeared for the polymers 1#, 2#, and 3# but did not appear for the polymer 4#. The peak at 175.9 ppm which was attributed to the characteristic peak of the carbon of COO (h) (Kopchick et al 2008) also appeared for the polymers 1#, 2#, and 3#, and got more and more obvious from 3# to 1#. Therefore, there was no doubt that St copolymerized with BA to produce poly (styrene-co-butyl acrylate) during suspension polymerization.Fig.…”
Electrospun polystyrene materials have been employed as oil absorbents, but they have visible drawbacks such as poor strength at low temperature and unreliable integrity because of brittleness and insufficient cohesive force among fibers. Butyl acrylate can polymerize into flexible chains, and its polymer can be used as elastomer and adhesive material. Thereby it is possible to obtain the material that has better performance in comparison with electrospun polystyrene material through the electrospinning of the copolymer of styrene and butyl acrylate. In this work, a polymer was synthesized through suspension polymerization by using styrene and butyl acrylate as comonomers. The synthesis of the copolymer of styrene and butyl acrylate was verified through dissolution and hydrolysis experimental data; as well through nuclear magnetic resonance spectrometry. The viscous flow activation energy of the solution consisting of copolymer and N, N-dimethylformamide was determined via viscosity method and then adopted to establish the entanglement characteristics of butyl acrylate’s chain segments. Finally, in order to electrospin the copolymer solution into fibrous membrane, the effects of monomer feed ratio and spinning parameters were investigated. The prepared fibrous membrane was found to have a potential use as oil absorbent.
“…The peaks at 13.7, 19.0, 30.4, and 63.8 ppm caused by the carbons of CH 3 and CH 2 (l, k, j, i) (Wyzgoski et al 2004) appeared for the polymers 1#, 2#, and 3# but did not appear for the polymer 4#. The peak at 175.9 ppm which was attributed to the characteristic peak of the carbon of COO (h) (Kopchick et al 2008) also appeared for the polymers 1#, 2#, and 3#, and got more and more obvious from 3# to 1#. Therefore, there was no doubt that St copolymerized with BA to produce poly (styrene-co-butyl acrylate) during suspension polymerization.Fig.…”
Electrospun polystyrene materials have been employed as oil absorbents, but they have visible drawbacks such as poor strength at low temperature and unreliable integrity because of brittleness and insufficient cohesive force among fibers. Butyl acrylate can polymerize into flexible chains, and its polymer can be used as elastomer and adhesive material. Thereby it is possible to obtain the material that has better performance in comparison with electrospun polystyrene material through the electrospinning of the copolymer of styrene and butyl acrylate. In this work, a polymer was synthesized through suspension polymerization by using styrene and butyl acrylate as comonomers. The synthesis of the copolymer of styrene and butyl acrylate was verified through dissolution and hydrolysis experimental data; as well through nuclear magnetic resonance spectrometry. The viscous flow activation energy of the solution consisting of copolymer and N, N-dimethylformamide was determined via viscosity method and then adopted to establish the entanglement characteristics of butyl acrylate’s chain segments. Finally, in order to electrospin the copolymer solution into fibrous membrane, the effects of monomer feed ratio and spinning parameters were investigated. The prepared fibrous membrane was found to have a potential use as oil absorbent.
“…Analogous limited solubility was also reported for poly(acrylic acid)-polystyrene-polyisobutylene-poly(styrene)-poly(acrylic acid) materials. [24] Because AA grafts could not be properly characterized by high temperature solution 1 H NMR spectroscopy, solid-state 13 C NMR spectroscopy was employed to determine the composition of the materials generated via acidolysis. Figure 4 compares the solid-state 13 C NMR spectrum of tBA graft G4 with that of the acidolysis product AA6.…”
Section: Synthesis and Characterization Of Acrylic Acid Graft Copolymersmentioning
Hydrophilic polyolefin materials were prepared by grafting tBA from PE macroinitiators bearing functionalized norbornene units capable of initiating an ATRP. This method produced semicrystalline graft copolymers (PE‐graft‐PtBA) with narrow molecular weight distributions (1.2–1.4) and tunable tBA content (2–21 mol‐%). Incorporation of tBA resulted in a decrease in crystallinity, but little change in the melting point of the products. Subsequently, the tBA moieties were converted into acrylic acid units through chemical and thermal means to generate PE‐graft‐PAA copolymers. The increased hydrophilicity of the resulting materials was verified by ATR‐IR, solid‐state 13C NMR spectroscopy, contact angle measurements, and TGA.magnified image
“…Many more efforts have focused on the synthesis of linear multiblock copolymers containing PIB segments. For example, block copolymers containing PIB as well as polystyrenes, poly(acrylic acid), polyamide, polypivalolactone, poly(methyl methacrylate), poly( N ‐isopropylacrylamide) polyurethanes and polyalloocimene have been synthesized and studied. Many of these PIB‐based block copolymers incorporated glassy or semicrystalline blocks, enabling them to behave as thermoplastic elastomers.…”
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