Surface Modification of CaCO3 Micro/Nanofillers by Pimelic Acid: Consequences on Crystallization Behaviors of Polypropylene Composites

2014 ◽  
Vol 804 ◽  
pp. 169-172
Author(s):  
Fang Wei Qi ◽  
Xue Gang Luo ◽  
Xiao Yan Lin
Keyword(s):  
Crystallization Behavior ◽  
Total Content ◽  
Growth Speed ◽  
Pimelic Acid ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Polypropylene Composites ◽  
Micro Particles ◽  
Pp Composites

In present study, two kinds of CaCO3 with micro-sized and nanometer-sized particles were treated by pimelic acid (PA) with different proportion. Then the treated particles (the total content of micro-sized and nanometer-sized CaCO3 particles was 10 wt%) were mixed with polypropylene (PP) to prepare CaCO3/PP composites by melting blending. The crystallization behavior and morphology of composites were studied by wide-angle-X-ray diffraction (WAXD), differential scanning calorimetry (DSC) and polarized microscope (PLM), respectively. Compared with PP and other samples, the content of β-crystal in the composite NCP2 where the ratio of nanoand micro particles was 2:8 (NCP2), reached the highest values. The growth speed of crystals in PP matrix was much quicker, leading to the larger spherulites than the NCP2 and NCP8. The time of complete nucleation for NCP8 was lower than PP, but higher than NCP2.

Research on compatibility and surface of high impact bio-based polyamide

2021 ◽  
pp. 095400832110055
Author(s):  
Yang Wang ◽  
Yuhui Zhang ◽  
Yuhan Xu ◽  
Xiucai Liu ◽  
Weihong Guo
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Scanning Electron Microscopy ◽  
Differential Scanning Calorimetry ◽  
Crystallization Behavior ◽  
High Impact ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Scanning Electron

The super-tough bio-based nylon was prepared by melt extrusion. In order to improve the compatibility between bio-based nylon and elastomer, the elastomer POE was grafted with maleic anhydride. Scanning Electron Microscopy (SEM) and Thermogravimetric Analysis (TGA) were used to study the compatibility and micro-distribution between super-tough bio-based nylon and toughened elastomers. The results of mechanical strength experiments show that the 20% content of POE-g-MAH has the best toughening effect. After toughening, the toughness of the super-tough nylon was significantly improved. The notched impact strength was 88 kJ/m2 increasing by 1700%, which was in line with the industrial super-tough nylon. X-ray Diffraction (XRD) and Differential Scanning Calorimetry (DSC) were used to study the crystallization behavior of bio-based PA56, and the effect of bio-based PA56 with high crystallinity on mechanical properties was analyzed from the microstructure.

The Effect of Uniaxial Stretching on the Crystallization Behaviors of Polylactic Acid Film

2011 ◽  
Vol 418-420 ◽  
pp. 625-628 ◽  
Author(s):  
Hui Li Xie ◽  
Kai Guo ◽  
Jin Zhou Chen ◽  
Wan Jie Wang ◽  
Ming Jun Niu ◽  
...  
Keyword(s):  
Polylactic Acid ◽  
Crystallization Behavior ◽  
Crystal Form ◽  
Stretch Ratio ◽  
Uniaxial Tensile ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Uniaxial Stretching ◽  
X Ray ◽  
Stretching Ratio

Abstract. The effect of uniaxial stretching of different stretching ratio at 80 °C, 90°C, 100°C, 110 °C and 120°C on the crystallization behavior of polylactic acid (PLA) film was investigated by using differential scanning calorimetry (DSC), wide-angle X-ray diffraction (XRD) and polarizing microscope (POM). The results showed that the crystallinity of PLA film was improved via uniaxial tensile orientation and increased with increasing stretch ratio, and the crystallinity of PLA film reached the maximum under the conditions of 90°C and stretching ratio 300%. Stretched PLA films show α crystal form. The spherulites deform to ellipsoids after stretching.

Crystallization Properties of Nucleated Poly(lactic acid)

2012 ◽  
Vol 549 ◽  
pp. 322-326 ◽  
Author(s):  
Yong Chen ◽  
Qiang Dou
Keyword(s):  
Lactic Acid ◽  
Crystallization Behavior ◽  
Polarized Light ◽  
Nucleating Agent ◽  
Poly Lactic Acid ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Crystallization Properties ◽  
Melting And Crystallization

The effect of a nucleating agent (NT-C) on the crystallization behavior of poly(lactic acid) (PLA) was studied. The melting and crystallization behavior and spherulitic morphology of the nucleated PLA were investigated by means of differential scanning calorimetry (DSC), wide angle X-ray diffraction (WAXD) and polarized light microscopy (PLM). It is found that the crystallization temperature and crystallinity increase, the spherulitic size decrease for the nucleated PLA. But the crystal structure of the nucleated PLA is not changed.

Structural and Electronic Properties of Zr-Ti-Cu-Ni-Be Alloys

2000 ◽  
Vol 644 ◽  
Author(s):  
Jörg F. Löffler ◽  
X.-P. Tang ◽  
Yue Wu ◽  
William L. Johnsona
Keyword(s):  
Differential Scanning Calorimetry ◽  
Small Angle Neutron Scattering ◽  
Crystallization Behavior ◽  
Volume Fraction ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Annealing Temperatures ◽  
Composition Space ◽  
Structural And Electronic Properties

AbstractWe present crystallization studies on Zr41.2Ti13.8Cu12.5Ni10Be22.5 (Vit1) and on other alloys, where the (Zr,Ti) and (Cu,Be) contents, along the line in composition space connecting Vit1 and Zr46.8Ti8.2Cu7.5Ni10Be27.5 (Vit4), were varied. Results from x-ray diffraction (XRD), small-angle neutron scattering (SANS) and differential scanning calorimetry (DSC) are combined to describe the crystallization behavior of these alloys at deep undercooling. SANS gives evidence for decomposition and the formation of nanometer sized crystals below a critical temperature Tc, which varies drastically as a function of composition. When Tc intersects with the glass transition temperature Tg, changes in the crystallization behavior are observed by DSC and XRD. At annealing temperatures near Tg, XRD resolves quasicrystalline phases for all alloy compositions from Vit1 to Vit4. From 9Be nuclear magnetic resonance (NMR) experiments performed on Vit1 upon annealing, we obtain information about the electronic structure and volume fraction of Be containing crystalline and quasicrystalline phases.

Crystallization Behavior and Mechanical Properties of PP/EVA Blends

2014 ◽  
Vol 1033-1034 ◽  
pp. 869-872
Author(s):  
Kun Yan Wang
Keyword(s):  
Mechanical Properties ◽  
Crystallization Behavior ◽  
Ethylene Vinyl Acetate ◽  
Melt Blending ◽  
X Ray Diffraction ◽  
Screw Extruder ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Blending Method ◽  
Twin Screw

Polypropylene (PP)/ethylene-vinyl acetate (EVA) blends were prepared using a twin-screw extruder by melt blending method. The influences of the EVA contents in PP/EVA blends on crystallization behavior and mechanical properties were investigated by X-ray diffraction (XRD) and differential scanning calorimetry (DSC). XRD results show that the EVA not change the crystal structure in the blends but only decrease the intensity of the diffraction peak. DSC results showed that the melting point and crystallization point decreased when EVA added to the blend. The tensile properties of PP/EVA blend become much better.

Investigation of Structure and Properties of the Al–Y–Ni–Co–Cu Metallic Glasses

2002 ◽  
Vol 17 (5) ◽  
pp. 1014-1018 ◽  
Author(s):  
Dmitri V. Louzguine ◽  
Akihisa Inoue
Keyword(s):  
Electron Microscopy ◽  
Metallic Glasses ◽  
Crystallization Behavior ◽  
Supercooled Liquid ◽  
Partial Replacement ◽  
Structure And Properties ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Transmission Electron

The present paper reports the effect of partial replacement of Ni by Cu in the Al85Y8Ni5Co2 alloy. The studied alloys were produced by rapid solidification. Glass-formation, crystallization behavior, and stability of the supercooled liquid were studied by x-ray diffraction, transmission electron microscopy, and differential scanning calorimetry. Partial replacement of Ni by Cu in the Al85Y8Ni5Co2 metallic glass caused formation of the nanoscale α–Al particles and resulted in a decrease in the crystallization temperature and disappearance of the supercooled liquid.

Co-Amorphous Telmisartan-Pimelic Acid with Improved Solubility

2020 ◽  
Vol 993 ◽  
pp. 776-784
Author(s):  
Ze Xin Wu ◽  
Wen Zhe Ma ◽  
Lei Wang ◽  
Chang Lin Yao ◽  
Shuang Song ◽  
...  
Keyword(s):  
Differential Scanning Calorimetry ◽  
Infrared Spectra ◽  
Molar Ratio ◽  
Pimelic Acid ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Amorphous System ◽  
Grinding Method ◽  
Apparent Solubility

Telmisartan (TEL), a type of antihypertensive drug, has poor solubility. To improve its solubility, the co-amorphous telmisartan with pimelic acid (PA) in molar ratio of 1:1 and 2:1, respectively, were obtained using a liquid-assisted grinding method. The co-amorphous system was characterized by the powder X-ray diffraction and differential scanning calorimetry. The molecular interactions of the co-amorphous were studied by the infrared spectra. After the formation of co-amorphous, the solubility of TELwas much improved, and the apparent solubility values were approximately 9-15 times as high as that of crystalline TEL. Moreover, the co-amorphous TEL-PA was stored under 25 °C/20% RH for a month without any evidence of conversion by powder X-ray diffraction analysis.

scholarly journals Understanding the Reinforcing Mechanisms in Kenaf Fiber/PLA and Kenaf Fiber/PP Composites: A Comparative Study

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
Seong Ok Han ◽  
Mehdi Karevan ◽  
I. Na Sim ◽  
Md A. Bhuiyan ◽  
Young Hun Jang ◽  
...  
Keyword(s):  
Thermomechanical Behavior ◽  
Green Composites ◽  
X Ray Diffraction ◽  
Renewable Materials ◽  
Scanning Calorimetry ◽  
Kenaf Fiber ◽  
X Ray ◽  
Melt Compounding ◽  
Pp Composites ◽  
Kenaf Fibers

This study focused on exploring the feasibility of green composites made from biodegradable and renewable materials as potential alternatives to petroleum polymer composites and understanding the reinforcing mechanisms in composites containing kenaf fibers (KF). KF-reinforced poly(lactide) acid (PLA) composites were made using melt compounding and injection molding, and their properties were compared to that of KF-reinforced polypropylene (PP) composites. The flexural properties and thermomechanical behavior were determined as a function of the fiber content, the crystallization of PLA and PP was studied using X-ray diffraction and differential scanning calorimetry, and the composites’ morphology was investigated using scanning electron microscopy. It was concluded that PLA exhibits higher modulus and Tg compared to those of neat PP. The modulus of the composites at 40 wt% fibers is 6.64 GPa and 2.96 GPa for PLA and PP, respectively. In general, addition of kenaf results in larger property enhancement in PP due to better wetting of the fibers by the low melt viscosity PP and the crystallization behavior of PP that is significantly altered by the fibers. The novelty of this work is that it provides one-to-one comparison of PLA and PP composites, and it explores the feasibility of fabricating green composites with enhanced properties using a simple scalable process.

Performance of Polypropylene Composites Filled by Calcium Carbonate Whiskers

2011 ◽  
Vol 399-401 ◽  
pp. 415-418
Author(s):  
Qiu Ju Sun ◽  
Gui Zhen Zhao ◽  
Shi Gang Xin ◽  
Shi Wei Wu ◽  
Jie Lu ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Calcium Carbonate ◽  
Sodium Stearate ◽  
X Ray Diffraction ◽  
Screw Extruder ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Polypropylene Composites ◽  
Twin Screw ◽  
Scanning Electron

Calcium carbonate (CaCO3) whiskers were firstly treated by sodium stearate, and then blended with polypropylene (PP) to prepare the composites by a closely intermeshing co-rotating twin-screw extruder at 200°C. The performance of the composites, such as thermal behavior, microstructure and mechanical properties, were analyzed with differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), X-ray diffraction (XRD), scanning electron microscopy (SEM) and mechanical testing. The results showed that CaCO3 whisker influenced the crystalline behavior of PP phase in the blends because of its intervening. Moreover, thermo-decomposing temperature, tensile and bending strengths of the blends all increased with increasing whisker content. CaCO3 whiskers had good reinforcing and toughening effects on PP.

The Effect of Poly(Butylene Adipate-co-Terephthalate) on Crystallization Behavior and Morphology of Poly(3-Hydroxybutyrate-co-3-Hydroxyvalerate)

2019 ◽  
Vol 798 ◽  
pp. 343-350
Author(s):  
Sitthi Duangphet ◽  
Damian Szegda ◽  
Karnik Tarverdi ◽  
Jim Song
Keyword(s):  
Crystal Structure ◽  
Crystallization Behavior ◽  
X Ray Diffraction ◽  
Twin Screw Extrusion ◽  
Scanning Calorimetry ◽  
Sem Images ◽  
X Ray ◽  
Screw Extrusion ◽  
Twin Screw ◽  
Matrix Morphology

The effects of poly(butylene adipate-co-terephthalate) (PBAT) on crystallization behavior and morphology of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) were studied to provide the useful information to control and improve PHBV processing. PHBV were blended with 15, 30 and 50 wt% PBAT by twin screw extrusion and these were subsequently compared to unblended PHBV. The rate of crystal development determined from differential scanning calorimetry (DSC) at 120 °C showed that the incorporation of PBAT retarded the crystal growth rate. Moreover, the crystal structure of polymer blends was examined by X-ray diffraction (XRD) and the results revealed that PBAT did not affect the crystal structure of PHBV. The responses of the melt-crystallized PHBV to different quantities of PBAT were recorded by polarized optical microscopy (POM). The results demonstrated that the size of spherulite dramatically increased when 15 wt% PBAT was added and the shape of spherulite was imperfect when PBAT reached 30 wt%. The morphologies of PHBV and its blends on the freeze-fractured specimens were exposed using scanning electron microscopy (SEM). The SEM images revealed the phase separation of PHBV/ PBAT blends in any composition. The morphology of 15 and 30 wt% PBAT presented droplet in matrix morphology and changed to co-continuous morphology at 50 wt% PBAT.

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