Hydrogen bonds in polymer blends

He, Yong; Zhu, Bo; Inoue, Yoshio

doi:10.1016/j.progpolymsci.2004.07.002

Cited by 441 publications

(274 citation statements)

References 216 publications

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“…These decrements indicate that PHP chains acquire enhanced mobility after blending leading to lower Tm values. In general, a decrease in the melting point in a polymeric blend can be due to both morphological effects (decrease in lamellar thickness) and to thermodynamic factors [15] (polymer-polymer interactions). Apparent enthalpy of fusion for PHP decreased in the blend samples.…”

Section: Differential Scanning Calorimetrymentioning

confidence: 99%

MISCIBILITY AND THERMAL DEGRADATION KINETICS OF POLY-β-ALANINE/POLY(3-HYDROXYPROPIONATE) BLENDS

Çatıker

Basan

2016

Journal of the Turkish Chemical Society, Section A: Chemistry

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Poly-β-alanine (PBA) and poly(3-hydroxypropionate) (PHP) were synthesized via base-catalyzed hydrogen transfer polymerization (HTP) of acrylamide and acrylic acid, respectively. Blends of PBA/PHP with different composition (PHP content, 5% to 75%) were studied using FTIR, DSC, TGA, XRD and polarized optical microscope to reveal both miscibility and thermal degradation kinetics of PBA/PHP blends. Optical images of blends were transparent and entirely uniform. Characteristic FTIR bands of both components shifted in higher frequencies with increasing fraction of another component. Melting temperature (Tm), thermal decomposition temperatures (Td), and enthalpy of fusion (ΔHf) of PHP decreased with increasing PBA fraction in blends. Thermal degradation kinetics of both components were studied by Freeman-Carroll method. Activation energies of thermal degradations of blend components were determined with good regression coefficients (at least 0.994). Activation energies of decomposition decreased from 224.14 to 86.125 kJmol -1 with increasing PHP content. XRD spectra of blends exhibited lower peak intensities than those of neat polymers. The spectroscopic, thermal, and optical methods revealed that PBA and PHP were miscible with a good compatibility in amorphous phase.

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Section: Differential Scanning Calorimetrymentioning

confidence: 99%

MISCIBILITY AND THERMAL DEGRADATION KINETICS OF POLY-β-ALANINE/POLY(3-HYDROXYPROPIONATE) BLENDS

Çatıker

Basan

2016

Journal of the Turkish Chemical Society, Section A: Chemistry

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“…Hydrogen bonding in polymer blends has been of interest to polymer scientists for several decades [21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39]. One major characteristic in such systems is the large positive deviation of glass transition temperature (T g ) from conventional mixing rules [22,23,26,35].…”

Section: Introductionmentioning

confidence: 99%

Thermal properties in strong hydrogen bonding systems composed of poly(vinyl alcohol), polyethyleneimine, and graphene oxide

Choi¹,

Hwang²,

Lee

2014

Carbon letters

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Blends of poly(vinyl alcohol) (PVA), polyethyleneimine (PEI), and graphene oxide (GO) were prepared by solution casting method. Calorimetric thermal properties of the blends were investigated. The T g s of PVA/PEI blends were higher than the T g s of either of the component polymers at low concentrations of PEI. These abnormal increases of T g s may be due to the negative entropy of mixing which is associated with strong hydrogen bonding between PVA and PEI. The degree of depression of s was not reduced by the negative entropy of mixing, since strong hydrogen bonding also causes an increase in the magnitude of negative c between PVA and PEI. The T g of PVA was increased significantly by adding 0.7 wt.% GO into PVA. The magnitude of negative c was increased by adding GO into the blends of PVA and PEI.

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“…The most frequently used monomers for preparation of effi cient compatibilizers for these systems are maleic anhydride, vinyl monomers, and itaconic and methacrylic copolymers containing reactive functional groups able to form hydrogen bonds between two or more polymer chains [6][7][8] . Other systems are based on highly elastic linear block copolymers comprising of ethylene/butylene rubber midblock and amorphous styrene terminal blocks (S-EB-S).…”

mentioning

confidence: 99%

Mechanical and thermal properties of PP/PBT blends compatibilized with triblock thermoplastic elastomer

Ignaczak

Wiśniewska

Janik

et al. 2015

Polish Journal of Chemical Technology

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A linear triblock copolymer, poly(styrene-b-etylene/butylene-b-styrene)(SEBS) thermoplastic elastomer (TPE) grafted with maleic anhydride was used for compatibilization of PP/PBT blends. PP/PBT blends of different mass ratios 60/40, 50/50, 40/60 were mixed with 2.5, 5.0 and 7.5 wt.% of SEBS copolymer in a twin screw extruder. Differential scanning calorimetry and dynamic mechanical analysis were performed to defi ne the phase structure of PP/PBT blends. TPE with a rubbery mid-block shifted the glass transition of PP/PBT blend towards lower temperatures, and signifi cant decrease the crystallization temperature of a crystalline phase of PP component was observed. The infl uence of the amount of compatibilizer and the blend composition on the mechanical properties (tensile and fl exural strengths, toughness and moduli) was determined. Addition of 5 wt.% of a triblock TPE led to a three-fold increase of PP/PBT toughness. A signifi cant increase of impact properties was observed for all materials compatibilized with the highest amount of SEBS copolymer.

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Hydrogen bonds in polymer blends

Cited by 441 publications

References 216 publications

MISCIBILITY AND THERMAL DEGRADATION KINETICS OF POLY-β-ALANINE/POLY(3-HYDROXYPROPIONATE) BLENDS

MISCIBILITY AND THERMAL DEGRADATION KINETICS OF POLY-β-ALANINE/POLY(3-HYDROXYPROPIONATE) BLENDS

Thermal properties in strong hydrogen bonding systems composed of poly(vinyl alcohol), polyethyleneimine, and graphene oxide

Mechanical and thermal properties of PP/PBT blends compatibilized with triblock thermoplastic elastomer

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