The morphological, mechanical, rheological, and thermal properties of PLA/PBAT blown films with chain extender

2018 ◽  
Vol 29 (6) ◽  
pp. 1706-1717 ◽  
Author(s):  
Xin Li ◽  
Xue Ai ◽  
Hongwei Pan ◽  
Jia Yang ◽  
Guanghui Gao ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Chain Extender ◽  
Blown Films

Effect of chain extender on the mechanical and thermal resistance properties of polyurethane liners for composite propellants

Polyurethanes ◽  
2016 ◽  
Vol 1 (1) ◽  
Author(s):  
P. Ross ◽  
G. Sevilla ◽  
J. Quagliano
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Thermal Properties ◽  
Chain Extender ◽  
Molecular Structures ◽  
Polymer Chains ◽  
Mechanical And Thermal Properties ◽  
Thermal Changes ◽  
Ft Ir ◽  
Chain Lengths

AbstractPolyurethane formulations utilized as liners for composite propellants were prepared by the reaction of toluene-2,4-diisocyanate (TDI) and isophorone diisocyanate (IPDI) with hydroxyl terminated polybutadiene (HTPB), while polymer chains were further extended with neopentyl glycol diol, NPG triol and two different triols (monoglyceryl ricinoleate, MRG and trimethylolpropane, TMP). Liners were formulated with micronized titanium dioxide mechanically dispersed in hydroxyl-terminated polybutadiene (HTPB). The molecular structures of liners were confirmed by FT-IR. Thermal properties indicated that the nature of chain extender (crosslinker) only slightly affected the temperatures for decomposition of liners. Two main thermal changes were found at 370∘C and another at around 440–500∘C, depending on the chain extender utilized. On the other side, mechanical properties varied within the range of 0,7-1,8 MPa, consistent with this kind of elastomers. Tensile strength at break was only significantly affected with TMP and MRG-chain extended liners at the lowest concentrations tested of 1,3 and 2% (w/w), respectively. However, the behaviour depended on whether TDI or IPDI isocyanate was utilized for curing. TMP 1,3% crosslinked liner cured with TDI had a tensile strength of 1,82MPa whileMRG-crosslinked liner cured with IPDI had a tensile strength of 1,56 MPa. It was observed that at the higher NCO/OH ratios essayed, tensile strength and hardness increased, improving mechanical properties. Our results confirmed that TMP and MRG triols together with NPG diols can be used to tailor mechanical and thermal properties of liners, considering their different hydroxyl functionalities and chain lengths.

scholarly journals Mechanical and Thermal Properties of Poly(urethane urea) Nanocomposites Prepared with Diamine-Modified Laponite

2008 ◽  
Vol 2008 ◽  
pp. 1-9 ◽  
Author(s):  
Joe-Lahai Sormana ◽  
Santanu Chattopadhyay ◽  
J. Carson Meredith
Keyword(s):  
Tensile Strength ◽  
Thermal Properties ◽  
Tensile Properties ◽  
Particle Concentration ◽  
Chain Extender ◽  
Mechanical And Thermal Properties ◽  
Elongation At Break ◽  
Hard Domain ◽  
A Chain

Nanocomposites based on segmented poly(urethane urea) were prepared by reacting a poly(diisocyanate) with diamine-modified Laponite-RD nanoparticles that served as a chain extender. The nanocomposites were prepared at a constantNH2to NCO mole ratio of 0.95, while varying the fraction of diamine-modified Laponite relative to the free diamine chain extender. Compared to neat poly(urethane urea), all nanocomposites showed increased tensile strength and elongation at break. As Laponite loading increased, tensile properties passed through a maximum at a particle concentration of 1 mass%, at which a 300% increase in tensile strength and 40% increase in elongation at break were observed. A maximum in urea and urethane hard-domain melting endotherms was also observed at this Laponite loading. Optimal mechanical and thermal properties coincided with a minimum in the size of the inorganic Laponite phase. Nanocomposites containing diamine-modified Laponite had higher tensile strengths than those with nonreactive monoamine-modified Laponite or diamine-modified Cloisite.

scholarly journals Thermal stability of segmented polyurethane elastomers reinforced by clay particles

2009 ◽  
Vol 63 (6) ◽  
pp. 621-628 ◽  
Author(s):  
Jelena Pavlicevic ◽  
Jaroslava Budinski-Simendic ◽  
Mészáros Szécsényi ◽  
Nada Lazic ◽  
Milena Spirkova ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Thermal Properties ◽  
Chain Extender ◽  
Hexamethylene Diisocyanate ◽  
Scanning Calorimetry ◽  
Modulated Differential Scanning Calorimetry ◽  
Polyurethane Elastomers ◽  
Oh Groups ◽  
Clay Nanoparticles ◽  
Thermal Stability Of

The aim of this work was to determine the influence of clay nanoparticles on thermal properties of segmented polyurethanes based on hexamethylene- diisocyanate, aliphatic polycarbonate diol and 1,4-butanediol as chain extender. The organically modified particles of montmorillonite and bentonite were used as reinforcing fillers. The structure of elastomeric materials was varied either by diol type or chain extender content. The ratio of OH groups from diol and chain extender (R) was either 1 or 10. Thermal properties of prepared materials were determined using modulated differential scanning calorimetry (MDSC). Thermal stability of obtained elastomers has been studied by simultaneously thermogravimetry coupled with DSC. The glass transition temperature, Tg, of soft segments for all investigated samples was about -33?C. On the basis of DTG results, it was concluded that obtained materials were very stable up to 300?C.

scholarly journals Influence of chain extender on mechanical, thermal and morphological properties of blown films of PLA/PBAT blends

2015 ◽  
Vol 43 ◽  
pp. 27-37 ◽  
Author(s):  
Liliane Cardoso Arruda ◽  
Marina Magaton ◽  
Rosário Elida Suman Bretas ◽  
Marcelo Massayoshi Ueki
Keyword(s):  
Chain Extender ◽  
Morphological Properties ◽  
Blown Films

Study on thermal properties of polyurethane-urea elastomers prepared with different dianiline chain extenders

2013 ◽  
Vol 33 (1) ◽  
pp. 87-94 ◽  
Author(s):  
Majid Barikani ◽  
Naghmeh Fazeli ◽  
Mehdi Barikani
Keyword(s):  
Thermal Properties ◽  
Chain Extender ◽  
Polymerization Reaction ◽  
Dsc Analysis ◽  
Scanning Calorimetry ◽  
Polymer Characterization ◽  
Cast Films ◽  
Mechanical Measurements ◽  
Chain Extenders ◽  
Thermal Stability Of

Abstract A number of polyurethane prepolymers based on polycaprolactone diol (PCL) and 4,4′-diphenyl methane diisocyanate (MDI) were synthesized and extended with different dianilines such as: 4,4′-methylenebis(2,6-diisopropylaniline) (M-DIPA), 4,4′-methylenebis(2,6diethylaniline) (M-DEA), 4,4′-methylenebis(ortho chloroaniline) (MOCA), 4,4′-methylenebis(2-isopropyl-6-methylaniline) (M-MIPA) and 4,4′-methylenebis(3-chloro-2,6-diethylaniline) (M-CDEA). Infrared (IR) spectroscopy was used to check the end of the polymerization reaction in addition to the polymer characterization. The effect of the dianiline structure on the thermal properties of the cast films were studied through dynamic mechanical measurements (DMTA), thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) analysis. It was found that the thermal properties and thermal stability of polyurethane are strongly affected by the molecular structure of the dianiline chain extender.

scholarly journals Development of Eco-Sustainable PBAT-Based Blown Films and Performance Analysis for Food Packaging Applications

Materials ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 5395
Author(s):  
Arianna Pietrosanto ◽  
Paola Scarfato ◽  
Luciano Di Maio ◽  
Loredana Incarnato
Keyword(s):  
Food Packaging ◽  
Mechanical Response ◽  
Chain Extender ◽  
Poly Lactic Acid ◽  
Blown Films ◽  
Beneficial Effects ◽  
Flexible Packaging ◽  
Improved Performance ◽  
And Performance ◽  
Good Transparency

In this work, eco-sustainable blown films with improved performance, suitable for flexible packaging applications requiring high ductility, were developed and characterized. Films were made by blending two bioplastics with complementary properties—the ductile and flexible poly(butylene-adipate-co-terephthalate) (PBAT) and the rigid and brittle poly(lactic acid) (PLA)—at a 60/40 mass ratio. With the aim of improving the blends’ performance, the effects of two types of PLA, differing for viscosity and stereoregularity, and the addition of a commercial polymer chain extender (Joncryl®), were analyzed. The use of the PLA with a viscosity ratio closer to PBAT and lower stereoregularity led to a finer morphology and better interfacial adhesion between the phases, and the addition of the chain extender further reduced the size of the dispersed phase domains, with beneficial effects on the mechanical response of the produced films. The best system composition, made by the blend of PBAT, amorphous PLA, and the compatibilizer, proved to have improved mechanical properties, with a good balance between stiffness and ductility and also good transparency and sealability, which are desirable features for flexible packaging applications.

Mechanical, Morphological and Thermal Properties of Rigid Polyurethane Foam: Effect of Chain Extender, Polyol and Blowing Agent

2009 ◽  
Vol 28 (2) ◽  
pp. 145-158 ◽  
Author(s):  
M. Thirumal ◽  
Dipak Khastgir ◽  
Nikhil K. Singha ◽  
B.S. Manjunath ◽  
Y.P. Naik
Keyword(s):  
Thermal Properties ◽  
Polyurethane Foam ◽  
Chain Extender ◽  
Rigid Polyurethane Foam ◽  
Blowing Agent

A study on the fracture, mechanical and thermal properties of chain extended recycled poly(ethylene terephthalate)

2015 ◽  
Vol 30 (8) ◽  
pp. 1157-1172 ◽  
Author(s):  
Nevin Gamze Karsli
Keyword(s):  
Thermal Properties ◽  
Ethylene Terephthalate ◽  
Chain Extender ◽  
Mechanical And Thermal Properties ◽  
Ftir Analysis ◽  
Dsc Analysis ◽  
Scanning Calorimetry ◽  
Poly Ethylene Terephthalate ◽  
Impact Modifier ◽  
Poly Ethylene

The aim of this study is to simultaneously improve the mechanical strength and fracture toughness properties of recycled poly(ethylene terephthalate) (r-PET). For this purpose, Joncryl® was used as chain extender and Lotader® was used as impact modifier. The combined effect of chain extender and impact modifier on the chemical, fractural, mechanical, and thermal properties of r-PET was investigated. Fourier transformed infrared spectroscopy (FTIR) analysis, EWF analysis, tensile test, and differential scanning calorimetry (DSC) analysis were performed. FTIR analysis revealed that all the epoxy groups in the Joncryl® were consumed during the compounding. EWF results showed that while toughness of r-PET decreased with the addition of Joncryl®, toughness was increased with addition of impact modifier Lotader®. It was found that 2.5% Lotader® usage at the same time with Joncryl® increased the tensile strength of r-PET as well as toughness. It was observed from DSC analysis that chain extender and impact modifier addition did not change the thermal transition temperatures of r-PET.

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