Bio-based hyperbranched poly(ester amide)–MWCNT nanocomposites: multimodalities at the biointerface

Pramanik, Sujata; Konwarh, Rocktotpal; Barua, Nilakshi; Buragohain, Alak Kumar; Karak, Niranjan

doi:10.1039/c3bm60170f

Cited by 25 publications

(22 citation statements)

References 43 publications

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“…The resistance of E. Coli bacteria to our films could be attributed to its double outer membrane wall (specific to Gram‐negative bacteria) forming a better protective barrier. This result is in accordance with the studies of S. Pramanik …”

Section: Resultssupporting

confidence: 93%

Performances of PCL/PVC/Organoclay Nanobioblends Films for Packaging Applications

Hadj‐Hamou

Yahiaoui

2019

Macromolecular Symposia

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A series of antimicrobial PCL/PVC/OMMTs nanobioblends films are successfully prepared via melt blending process of the poly (ϵ‐caprolactone) (PCL), poly (vinyl chloride) (PVC), and three different clay types namely Cloisite 30B (C30B), trimethylhexadecyl ammonium (OMMT1), and cetylpyridinium chloride monohydrate (OMMT2) modified montmorillonite. All the PCL/PVC/OMMTs nanocomposites display mixed intercalated/partially exfoliated structures as attested by X‐Ray Diffraction and Transmission Electron Microscopy. Glass transition, fusion and cristallization of these nanomaterials are studied using differential scanning calorimetry (DSC). The organoclay effect on the mechanical, barrier and antimicrobial properties is investigated. The results confirm that the insertion of 3 wt% of OMMT (whatever its intercalant agent nature) into the PCL/PVC matrix leads to (1) a remarkable improvement in barrier properties, (2) an interesting enhancement in mechanical properties, and (3) a strong antimicrobial activity against Staphylococcus aureus (Gram‐positive) and Escherichia coli (Gram‐negative).

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Section: Resultssupporting

confidence: 93%

Performances of PCL/PVC/Organoclay Nanobioblends Films for Packaging Applications

Hadj‐Hamou

Yahiaoui

2019

Macromolecular Symposia

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“…The first stage was between 220 and 350 C. The second stage was between 350 and 425 C. The third stage was between 500 and 650 C. It was reasonable to identify the initial decomposition from E1 and later with from lignin as verified as shown in Figure 8(d), because E1 is constituted with highly branched aliphatic chains and ester groups were considerably labile to thermal decomposition. 63,64 Whereas lignin, comprised of highly cross-linked aromatic backbones and various aliphatic side chains, gradually degraded and resisted thermal decomposition to form appreciable amount of char. 65 Lignin content was not shown to affect the first degradation stage of the copolymers.…”

Section: Synthesis Of Lignin-copoly(ester-amine) Elastomersmentioning

confidence: 99%

Lignin valorization by forming toughened thermally stimulated shape memory copolymeric elastomers: Evaluation of different fractionated industrial lignins

Sivasankarapillai

McDonald

2014

J of Applied Polymer Sci

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Lignin-based thermal responsive dual shape memory copolymeric elastomers were prepared with a highly branched prepolymer (HBP, A 2 B 3 type) via a simple one-pot bulk polycondensation reaction. The effect of fractionated lignin type (with good miscibility in the HBP) on copolymer properties was investigated. The thermal and mechanical properties of the copolymers were characterized by DMA, DSC, and TGA. Tensile properties were dominated by HBP <45% lignin content while lignin dominated >45% content. The copolymers glass transition temperature (T g ) increased with lignin content and lignin type did not play a significant role. Thermally stimulated dual shape memory effects (SME) of the copolymers were quantified by cyclic thermomechanical tests. All copolymers had shape fixity rate >95% and >90% shape recovery for all compositions. The copolymer shape memory transition temperature (T trans ) increased with lignin content and T trans was 20 C higher than T g . Lignin, a renewable resource, can be used as a netpoint segment in polymer systems with SME behavior.

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“…To observe decomposition transitions differential TGA (DTG) was also performed (Figure 5). The first stage was between 170 and 380 C. The second stage was between 380 and 500 C. The third stage was between 500 and 650 C. The first and second stages are most likely assigned to the D1 component of the copolymer since these are constituted with highly branched aliphatic chains with labile ester linkages, 36,37 although side chain of lignin also participated the decomposition ( Figure 5). The long DDDA chains in D1 likely forms crystalline zones in the copolymer and will decompose at temperature range from 420 to 480 C (2nd stage herein).…”

Section: Thermal Stabilitymentioning

confidence: 99%

Lignin valorization by forming thermally stimulated shape memory copolymeric elastomers—Partially crystalline hyperbranched polymer as crosslinks

Sivasankarapillai

McDonald

2014

J of Applied Polymer Sci

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Lignin based thermal‐responsive elastomers were produced by a melt polycondensation reaction with a long alkyl chain hyperbranched poly(ester‐amine‐amide) (B3‐A2‐CB31). The effect of lignin content on elastomers properties was investigated. The thermal and mechanical properties of the copolymers were characterized by DMA, DSC, and TGA. The morphology of the copolymer was examined by SEM. Tensile properties were dominated by HBP <25% lignin content while lignin dominated >25% content. The copolymers glass transition temperature (Tg) increased with lignin content. The elastomer with 30% lignin content demonstrated optimal mechanical properties (tensile strength 5.3 MPa, Young's modulus 8.9 MPa, strain at break 301%, and toughness 1.03 GPa). Thermally stimulated dual shape memory effects (SME) of the copolymers were quantified by cyclic thermomechanical tests. The transition temperature (Ttrans) of the polymer was able to be controlled (room to body temperature) by varying the amount of lignin added which broadens the range to medical applications. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 41103.

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Bio-based hyperbranched poly(ester amide)–MWCNT nanocomposites: multimodalities at the biointerface

Cited by 25 publications

References 43 publications

Performances of PCL/PVC/Organoclay Nanobioblends Films for Packaging Applications

Performances of PCL/PVC/Organoclay Nanobioblends Films for Packaging Applications

Lignin valorization by forming toughened thermally stimulated shape memory copolymeric elastomers: Evaluation of different fractionated industrial lignins

Lignin valorization by forming thermally stimulated shape memory copolymeric elastomers—Partially crystalline hyperbranched polymer as crosslinks

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