Crystallization behavior of functional polypropylene grafted graphene oxide nanocomposite

RSC Advances ◽  
2015 ◽  
Vol 5 (80) ◽  
pp. 65058-65067 ◽  
Author(s):  
Cai-Liang Zhang ◽  
Tao-Tao Wang ◽  
Xue-Ping Gu ◽  
Lian-Fang Feng
Keyword(s):  
Graphene Oxide ◽  
Isothermal Crystallization ◽  
Crystallization Behavior ◽  
Crystallization Process ◽  
Crystallization Behaviors

With an aim to understand a role of grafted graphene oxide (GO) in crystallization process of polymer, isothermal and non-isothermal crystallization behaviors of a functional polypropylene grafted GO nanocomposite were investigated systematically.

scholarly journals Non-Isothermal Crystallization Behavior and Thermal Properties of Polyethylene Tuned by Polypropylene and Reinforced with Reduced Graphene Oxide

Nanomaterials ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 1428
Author(s):  
Antimo Graziano ◽  
Otavio Augusto Titton Dias ◽  
Christian Garcia ◽  
Shaffiq Jaffer ◽  
Jimi Tjong ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Graphene Oxide ◽  
Thermal Properties ◽  
Reduced Graphene Oxide ◽  
Isothermal Crystallization ◽  
Crystallization Behavior ◽  
Research Work ◽  
Deformation Resistance ◽  
Reduced Graphene ◽  
Heat Deformation

This research work is the first to report thermal stability, heat deformation resistance, and crystallization behavior of a Polyethylene (PE)-based biphasic polyolefin system reinforced with Reduced Graphene Oxide (RGO), which was obtained through Graphene Oxide (GO) chemical reduction. Polypropylene (PP) represented the polymeric dispersed phase. A strategic PE/PP/RGO manufacturing procedure was employed to thermodynamically localize RGO at the PE/PP interface, as confirmed by Transmission Electron Microscopy (TEM), bringing a uniform micro phase dispersion into the macro phase. In addition, studies of PE non-isothermal crystallization kinetics indicated that the morphology tunable micro phase and the nanolayered RGO promoted a nucleation-controlled PE crystallization, which was supported by Polarized Light Optical Microscopy (PLOM). This, together with fine morphology, justified the remarkable enhancement registered for the ternary system’s thermal stability and heat deformation resistance. Different filler loads were employed, with weight fractions of 2% and 4%. It was observed that the former, being better exfoliated and more homogeneously distributed at the PE/PP interface than the latter, led to a more improved PE crystallization, alongside a greater ternary system’s thermal properties. Moreover, the thermal stability of PE/PP reinforced with 2% of RGO was even higher than that of virgin PP, while their heat deformation resistance values were found to be similar. Therefore, this unique outcome provides industries, such as the energy and automotive sectors, with the opportunity to substitute PP-rich products with those mostly comprised of a cheaper, more abundant, yet performant PE.

Non-isothermal crystallization behavior of PLA/LLDPE/nanoclay hybrid: Synergistic role of LLDPE and clay

2013 ◽  
Vol 565 ◽  
pp. 102-113 ◽  
Author(s):  
Ladan As’habi ◽  
Seyed Hassan Jafari ◽  
Hossein Ali Khonakdar ◽  
Liane Häussler ◽  
Udo Wagenknecht ◽  
...  
Keyword(s):  
Isothermal Crystallization ◽  
Crystallization Behavior

Isothermal Crystallization of PET/PTT-CNTs Composites

2013 ◽  
Vol 750-752 ◽  
pp. 191-194
Author(s):  
Fang Xie ◽  
Hao Liang ◽  
Xiao Jun Ren ◽  
Yi Fa Chen
Keyword(s):  
Isothermal Crystallization ◽  
Crystallization Behavior ◽  
Crystallization Process ◽  
Avrami Equation ◽  
Half Time

Isothermal crystallization behavior of PET/PTT-CNTs composites was investigated by DSC. The Avrami equation was employed to describe the isothermal crystallization process. The change of the half-time of crystallization t1/2 suggested that the addition of CNTs in the composites can accelerate the overall crystallization process.

Effects of Aspect Ratio of Carbon Nanotubes on Crystallization Behavior of Polylactide Composites

2013 ◽  
Vol 716 ◽  
pp. 25-29
Author(s):  
Zhao Hua Xu ◽  
Heng Li
Keyword(s):  
Carbon Nanotubes ◽  
Aspect Ratio ◽  
Multiwalled Carbon Nanotubes ◽  
Nucleation Rate ◽  
Isothermal Crystallization ◽  
Crystallization Behavior ◽  
Small Aspect Ratio ◽  
Multiwalled Carbon ◽  
Crystallization Behaviors ◽  
Aspect Ratios

Biodegradable polylactide (PLA) composites/pristine multiwalled carbon nanotubes (P-CNT) composites with three different aspect ratios (length to diameter) are prepared by coagulation method. Isothermal crystallization and morphology of neat PLA and its composites are further investigated to clarify the effects of aspect ratio of CNT on the crystallization behaviors of PLA in its composites. Results show that the different aspect ratio CNT exhibit substantially different effects on PLA crystallization. It is interesting to find that small aspect ratio CNT (CNT-S) greatly promotes nucleation rate than big aspect ratio CNT (CNT-L).

scholarly journals Significantly Enhanced Crystallization of Poly(ethylene succinate-co-1,2-propylene succinate) by Cellulose Nanocrystals as an Efficient Nucleating Agent

Polymers ◽  
2022 ◽  
Vol 14 (2) ◽  
pp. 224
Author(s):  
Siyu Pan ◽  
Zhiguo Jiang ◽  
Zhaobin Qiu
Keyword(s):  
Crystal Structure ◽  
Cellulose Nanocrystals ◽  
Crystallization Behavior ◽  
Crystallization Process ◽  
Crystallization Rate ◽  
Nucleating Agent ◽  
Melt Crystallization ◽  
Crystalline Morphology ◽  
Poly Ethylene

Poly(ethylene succinate-co-1,2-propylene succinate) (PEPS) is a novel aliphatic biodegradable polyester with good mechanical properties. Due to the presence of methyl as a side group, the crystallization rate of PEPS is remarkably slower than that of the poly(ethylene succinate) homopolymer. To promote the potential application of PEPS, the effect of cellulose nanocrystals (CNC) on the crystallization behavior, crystalline morphology, and crystal structure of PEPS was investigated in this research with the aim of increasing the crystallization rate. CNC enhanced both the melt crystallization behavior of PEPS during the cooling process and the overall crystallization rate during the isothermal crystallization process. The crystallization rate of PEPS became faster with an increase in CNC content. The crystalline morphology study directly confirmed the heterogeneous nucleating agent role of CNC. The crystal structure of PEPS remained unchanged in the composites. On the basis of the interfacial energy, the nucleation mechanism of PEPS in the composites was further discussed by taking into consideration the induction of CNC.

Non-Isothermal Crystallization Behavior in Zr55Cu30Ni5Al10 Bulk Metallic Glass

2010 ◽  
Vol 146-147 ◽  
pp. 560-564 ◽  
Author(s):  
Ping Jun Tao ◽  
Yuan Zheng Yang ◽  
Xiao Jun Bai ◽  
Zhong Xin Mu ◽  
Guo Qing Li
Keyword(s):  
Amorphous Alloy ◽  
Isothermal Crystallization ◽  
Crystallization Behavior ◽  
Crystallization Process ◽  
Nucleation And Growth ◽  
Bulk Amorphous Alloy ◽  
Copper Mold ◽  
Ozawa Method ◽  
Heating Rates ◽  
X Ray

A Zr55Cu30Ni5Al10 bulk amorphous alloy was prepared by using copper mold suction casting and the X-ray diffractometer (XRD) was utilized to determine its structure. The non-isothermal crystallization behavior of the amorphous alloy was studied via a differential scanning calorimeter (DSC) by Kissinger and Ozawa methods. The results showed that all the thermodynamic parameters move to higher temperatures with increasing heating rates. The activation energies for crystallization calculated by Kissinger and Ozawa method are 291.27 and 288.53 kJ/mol, respectively. With the increase of heating rate, the rate of x vs. T descends. The crystallization mechanism is typical nucleation and growth of crystalline grains, among which the latter dominates the total crystallization process.

scholarly journals Effect of Alkyl Chain Length in POSS Nanocage on Non-Isothermal Crystallization Behavior of PCL/Amino-POSS Nanocomposites

Polymers ◽  
2019 ◽  
Vol 11 (10) ◽  
pp. 1719 ◽  
Author(s):  
Fernández ◽  
Guzmán ◽  
Ramos ◽  
Fernández
Keyword(s):  
Size Distribution ◽  
Crystallization Temperature ◽  
Isothermal Crystallization ◽  
Crystallization Behavior ◽  
Crystallization Process ◽  
Polyhedral Oligomeric Silsesquioxane ◽  
Degree Of Crystallinity ◽  
Polyhedral Oligomeric Silsesquioxanes ◽  
Scanning Calorimetry ◽  
Oligomeric Silsesquioxane

The study of the non-isothermal crystallization behavior of polymers is of great importance due to the effect of degree of crystallinity and crystallization process on the polymer properties. The effect of aminopropylisobutyl polyhedral oligomeric silsesquioxane (APIBPOSS) and aminopropylisooctyl polyhedral oligomeric silsesquioxane (APIOPOSS) on poly(ε-caprolactone) (PCL) crystallization is studied by differential scanning calorimetry (DSC) under non-isothermal conditions and polarized optical microscopy (POM). The crystallization kinetics is analyzed using the Avrami and Mo models, and effective activation energies are evaluated by the Friedman isoconversional method. The results show that the compatibility between polyhedral oligomeric silsesquioxanes (POSS) and PCL and POSS loading affect the crystallization process. A higher crystallization temperature, a narrower size distribution of crystallite, and a faster crystallization rate are obtained in the presence of all the studied contents of APIBPOSS and at lower contents of APIOPOSS. At APIOPOSS contents higher than 2 wt %, the crystallization temperature is lowered, the size distribution of crystallite is broadened, and the crystallization process is retarded. The presence of POSS leads to an increase in the number of nucleation sites, and a reduction in the size of the crystallite and the overall degree of crystallinity, as a result of the confinement of PCL chains caused by POSS nanoparticles.

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