Coupling effect of PVDF molar mass and carboxyl content in CNTs on microstructure and thermal properties of CNT/PVDF composites

2018 ◽  
Vol 5 (6) ◽  
pp. 065031
Author(s):  
Run Tian ◽  
Yanxia Zhang ◽  
Zhipeng Li ◽  
Yangyang Huan ◽  
Guangfen Li ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Molar Mass ◽  
Coupling Effect ◽  
Carboxyl Content

scholarly journals Processing of (Co)Poly(2-oxazoline)s by Electrospinning and Extrusion from Melt and the Postprocessing Properties of the (Co)Polymers

Polymers ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 295 ◽  
Author(s):  
Wojciech Wałach ◽  
Natalia Oleszko-Torbus ◽  
Alicja Utrata-Wesołek ◽  
Marcelina Bochenek ◽  
Ewa Kijeńska-Gawrońska ◽  
...  
Keyword(s):  
Differential Scanning Calorimetry ◽  
Thermal Properties ◽  
Molar Mass ◽  
Three Dimensional ◽  
Fused Deposition Modelling ◽  
Processing Conditions ◽  
Structure And Properties ◽  
Scanning Calorimetry ◽  
Gradient Copolymers ◽  
Fused Deposition

Poly(2-oxazoline) (POx) matrices in the form of non-woven fibrous mats and three-dimensional moulds were obtained by electrospinning and fused deposition modelling (FDM), respectively. To obtain these materials, poly(2-isopropyl-2-oxazoline) (PiPrOx) and gradient copolymers of 2-isopropyl- with 2-n-propyl-2-oxazoline (P(iPrOx-nPrOx)), with relatively low molar masses and low dispersity values, were processed. The conditions for the electrospinning of POx were optimised for both water and the organic solvent. Also, the FDM conditions for the fabrication of POx multi-layer moulds of cylindrical or cubical shape were optimised. The properties of the POx after electrospinning and extrusion from melt were determined. The molar mass of all (co)poly(2-oxazoline)s did not change after electrospinning. Also, FDM did not influence the molar masses of the (co)polymers; however, the long processing of the material caused degradation and an increase in molar mass dispersity. The thermal properties changed significantly after processing of POx what was monitored by increase in enthalpy of exo- and endothermic peaks in differential scanning calorimetry (DSC) curve. The influence of the processing conditions on the structure and properties of the final material were evaluated having in a mind their potential application as scaffolds.

The kinetics of poly(butylene succinate) synthesis and the influence of molar mass on its thermal properties

2014 ◽  
Vol 131 (16) ◽  
pp. n/a-n/a ◽  
Author(s):  
Matthieu Garin ◽  
Lan Tighzert ◽  
Isabelle Vroman ◽  
Sinisa Marinkovic ◽  
Boris Estrine
Keyword(s):  
Thermal Properties ◽  
Molar Mass ◽  
Butylene Succinate ◽  
Kinetics Of

Morphology, thermal properties and mechanical relaxations of metallocene syndiotactic polypropylenes

e-Polymers ◽  
2012 ◽  
Vol 12 (1) ◽  
Author(s):  
Ester López Moya ◽  
José M. Gómez-Elvira ◽  
Rosario Benavente ◽  
Ernesto Pérez
Keyword(s):  
Thermal Properties ◽  
Temperature Gradient ◽  
Small Proportion ◽  
Molar Mass ◽  
Processing Conditions ◽  
Syndiotactic Polypropylene ◽  
Relative Contribution ◽  
Two Samples ◽  
Concurrent Processes ◽  
Crystallisation Rate

AbstractThe complex polymorphic behaviour of four syndiotactic polypropylene (sPP) samples have been analysed by means of DSC and WAXD techniques. Two samples (sPP1, sPP2) were synthesised via metallocene polymerization by using the ansa-zirconocene Ph2C(Cp)(9-Flu)ZrCl2 as catalyst. Finally, two additional specimens with different molar masses (sPP1-Fr1, sPP1-Fr2) were prepared from the most syndiotactic sPP1 sample by temperature gradient extraction. The WAXD analysis shows that together with the orthorhombic form I, form II can coexist in a variable but small proportion depending on both the chain features and the processing conditions. The relative contribution of the disordered and the ordered types of form I is also dictated by molar mass, configurational microstructure as well as processing conditions. The observed changes in the thermal properties as measured by DSC and in the mechanic-dynamical relaxations of the samples, on slowing the crystallisation rate down, can be rationalised in terms of two concurrent processes, namely the perfection undergone by the crystals and the segregation of the amorphous phase.

Combination of preparative and two-dimensional chromatographic fractionation with thermal analysis for the branching analysis of polyethylene

2018 ◽  
Vol 9 (22) ◽  
pp. 3142-3157 ◽  
Author(s):  
Paul S. Eselem Bungu ◽  
Kristina Pflug ◽  
Harald Pasch
Keyword(s):  
Thermal Analysis ◽  
Thermal Properties ◽  
Molar Mass ◽  
Branching Fractions ◽  
Two Dimensional ◽  
Chromatographic Fractionation

Multiple preparative fractionation of LDPE provides molar mass and branching fractions that are analyzed regarding their thermal properties.

scholarly journals Synthesis and Characterization of Lignin-Based Polyurethane as a Potential Compatibilizer

2018 ◽  
Vol 18 (3) ◽  
pp. 390 ◽  
Author(s):  
Salma Ilmiati ◽  
Jana Hafiza ◽  
Jaka Fajar Fatriansyah ◽  
Elvi Kustiyah ◽  
Mochamad Chalid
Keyword(s):  
Molecular Weight ◽  
Surface Tension ◽  
Thermal Properties ◽  
Polyethylene Glycol ◽  
Thermal Degradation ◽  
Molar Mass ◽  
Sessile Drop ◽  
Synthesis And Characterization ◽  
Hyperbranched Structure

Lignin is one of the most abundant biopolymer on earth. It has polar and non-polar side due to its hyperbranched structure, but the polarity of lignin has a higher tendency than non-polarity. Lignin has potential to be compatibilizer if the portion of non-polar can be increased. This research is focused on investigate the synthesis of lignin-based polyurethane to enhance the portion of non-polarity in lignin. Lignin-based polyurethane was prepared by reacting variation 4,4'-Methylenebis(cyclohexyl isocyanate) (HMDI) and polyethylene glycol (PEG), then lignin was added to the reaction. In this study, the structure of lignin-based polyurethane was confirmed by NMR and FTIR. NMR and FTIR showed that lignin successfully grafted. NMR, also used to investigate the variation molar mass of PEG and isocyanate contents effects to polarity of lignin-based polyurethane. The polarity of lignin-based polyurethane decrease as the composition of HMDI and molecular weight of PEG increase. This result also occurs on the sessile drop test that used to determine surface tension of lignin-based polyurethane. The thermal properties of lignin-based polyurethane also investigate using STA. Based on STA, enhancement of composition of HMDI and PEG increase thermal degradation and resistance of lignin-based polyurethane.

Effect of low molar mass liquid crystal and lubricant on miscibility and thermal properties of syndiotactic polystyrene blends

2009 ◽  
Vol 114 (4) ◽  
pp. 2053-2059 ◽  
Author(s):  
Pichet Pahupongsab ◽  
Supakanok Thongyai ◽  
Sirirat Wacharawichanant ◽  
Piyasan Praserthdam
Keyword(s):  
Thermal Properties ◽  
Liquid Crystal ◽  
Molar Mass ◽  
Syndiotactic Polystyrene

Effect of hydrolysis on molar mass and thermal properties of poly (ester urethanes)

1994 ◽  
Vol 41 (6) ◽  
pp. 1441-1452 ◽  
Author(s):  
A. Pegoretti ◽  
A. Penati ◽  
J. Kolarík
Keyword(s):  
Thermal Properties ◽  
Molar Mass

Mechanical and Thermal Properties Biodegradable Microcellular Foams Based on Polylactide and Polycaprolactone

2013 ◽  
Vol 791-793 ◽  
pp. 274-277
Author(s):  
Teng Fei Shen ◽  
Ying Juan Sun
Keyword(s):  
Tensile Strength ◽  
Thermal Properties ◽  
Elastic Modulus ◽  
Coupling Effect ◽  
Average Pore Size ◽  
Mechanical And Thermal Properties ◽  
Average Pore ◽  
Microcellular Foams ◽  
Final Microstructure ◽  
Lower Glass Transition Temperature

In this work, the producing of a series of biodegradable polylactide (PLA)/polycaprolactone (PCL) microcellular foams by rapid solvent casting method was investigated and discussed. Scanning electron microscopy (SEM) showed the average pore size in the structure was around 7 μm and the final microstructure was a combination of open and closed cells. The effect of PCL segments added on the mechanical and thermal behaviors was studied. According to the results, PLA/PCL biomaterial had lower glass transition temperature (Tg) in comparison with neat PLA polymer. In addition, the tensile strength and elastic modulus became poor when PCL added in. For obtained better mechanical and thermal properties, EC-blocked polyisocyanate (EC-bp), which was synthesized from reaction of toluene 2, 4-diisocyanate with dimethylol propionic acid and trimethylolpropane followed by addition of ethyl cellosolve (EC), were introduced. It was found that the tensile strength and elastic modulus were significantly increased by addition of EC-bp, which can be explained by coupling effect occurred between PLA and PCL.

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