Crystal Morphology and Thermal Properties of PA6/PP-g-MAH/POE Blends

2011 ◽  
Vol 366 ◽  
pp. 314-317
Author(s):  
Ming Tao Run ◽  
Wen Zhou ◽  
Bing Tao Xing ◽  
Meng Yao
Keyword(s):  
Differential Scanning Calorimetry ◽  
Thermal Properties ◽  
Crystal Morphology ◽  
Crystallization Rate ◽  
Screw Extruder ◽  
Scanning Calorimetry ◽  
Acicular Crystal ◽  
Polarized Optical Microscopy ◽  
Twin Screw ◽  
Higher Temperature

The crystal morphology and thermal properties of the PA6/PP-g-MAH/POE blends prepared by twin-screw extruder were studied by polarized optical microscopy (POM) and differential scanning calorimetry (DSC) respectively. The results suggest that the crystal morphology of PA6 is acicular crystal while PP-g-MAH is micro-spherulites; The acicular crystals form across POE phase to PA6 phase, and the acicular crystals of PA6 in the POE phase have better regularity in dimension than those in amorphous PA6 phase. Acting as a compatibilizer, PP-g-MAH improves the miscibility of PA6 and POE, leading to the glass transition temperature of the blends decreases gradually with increasing POE contents. PA6 and PP-g-MAH can crystallize individually, and the formed PA6 crystals induced the crystallization of PP-g-MAH at higher temperature; furthermore, PP-g-MAH and POE components can increase the crystallization rate of PA6.

Mechanical and thermal characterization of grafted PP-NCC nanocomposites

2019 ◽  
pp. 089270571987822
Author(s):  
Saud Aldajah ◽  
Mohammad Y Al-Haik ◽  
Waseem Siddique ◽  
Mohammad M Kabir ◽  
Yousef Haik
Keyword(s):  
Thermal Properties ◽  
Interfacial Adhesion ◽  
Thermal Characterization ◽  
Mechanical And Thermal Properties ◽  
Screw Extruder ◽  
Scanning Calorimetry ◽  
Three Point Bending ◽  
Twin Screw ◽  
Thermal Stability Of

This study reveals the enhancement of mechanical and thermal properties of maleic anhydride-grafted polypropylene (PP- g-MA) with the addition of nanocrystalline cellulose (NCC). A nanocomposite was manufactured by blending various percentages of PP, MA, and NCC nanoparticles by means of a twin-screw extruder. The influence of varying the percentages of NCC on the mechanical and thermal behavior of the nanocomposite was studied by performing three-point bending, nanoindentation, differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and Fourier-transform infrared (FTIR) spectroscopy tests. The novelty of this study stems on the NCC nanoparticles and their ability to enhance the mechanical and thermal properties of PP. Three-point bending and nanoindentation tests revealed improvement in the mechanical properties in terms of strength, modulus, and hardness of the PP- g-MA nanocomposites as the addition of NCC increased. SEM showed homogeneity between the mixtures which proved the presence of interfacial adhesion between the PP- g-MA incorporated with NCC nanoparticles that was confirmed by the FTIR results. DSC and TGA measurements showed that the thermal stability of the nanocomposites was not compromised due to the addition of the coupling agent and reinforced nanoparticles.

Preparation and Properties of PLLA-co-bis A/VMT Nanocomposites

2010 ◽  
Vol 150-151 ◽  
pp. 1466-1469
Author(s):  
Ya Li Bai ◽  
Hong Xu ◽  
Zhi Ping Mao
Keyword(s):  
Thermal Stability ◽  
Differential Scanning Calorimetry ◽  
Crystallization Behavior ◽  
Crystallization Rate ◽  
Scanning Calorimetry ◽  
Polarized Optical Microscopy ◽  
Thermogravimetric Analyzer ◽  
Melt Polycondensation ◽  
The Fourier Transform

Poly(L-lactic acid)-co-bisphenol-A epoxy resin/vermiculite nanocomposites（PLLA-co-bis A /VMT）were prepared by in-situ melt polycondensation of L-LA in the presence of amino-modified vermiculite. The fourier transform infrared (FTIR) spectra were used to investigate molecular interactions between the modified vermiculite and PLLA. The detailed thermal property and crystallization behavior of samples were studied by using polarized optical microscopy (POM), differential scanning calorimetry (DSC) and thermogravimetric analyzer (TGA). The result indicated that the thermal stability, overall crystallization rate and spherulitic texture of PLLA-co-bis A were strongly influenced in the presence of vermiculite particles.

Step-Scan DSC Study on the Melting Behavior of Polypropylene/Attapulgite Nanocomposites

2011 ◽  
Vol 284-286 ◽  
pp. 763-768
Author(s):  
Li Li Sun ◽  
Kun Hu ◽  
Lin Chen ◽  
Kang Zheng ◽  
Xing You Tian
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Differential Scanning Calorimetry ◽  
Melting Behavior ◽  
Secondary Crystallization ◽  
Screw Extruder ◽  
Scanning Calorimetry ◽  
Twin Screw ◽  
Multiple Melting ◽  
Scanning Electron

Attapulgite(AT) was modified by grafting with butyl acrylate(BA) via polymerizations initiated by Gamma radiation. The polypropylene(PP)/AT nanocomposites were synthesized via melting extrude in a twin-screw extruder. The thermogravimetry(TG) and scanning electron microscopy (SEM) were used to assess the graft ratio of the hybrid materials and the dispersion of AT, respectively. Step-scan differential scanning calorimetry(SSDSC) was used to study the influence of AT on the crystallization and subsequent melting behavior. The results indicated that PP and PP/AT nanocomposites underwent multiple melting and secondary crystallization processes during heating. The melting behaviours of PP and PP/AT nanocomposites varied with the variation of crystallization temperature and AT content.

Thermal Properties Determination of Polypropylene/Rice Straw Biocomposite Foam via DSC

2014 ◽  
Vol 695 ◽  
pp. 216-219
Author(s):  
Nazuha Tugiman ◽  
Zurina Mohamad ◽  
Wan Aizan Wan Abdul Rahman
Keyword(s):  
Thermal Properties ◽  
Rice Straw ◽  
Dicumyl Peroxide ◽  
Polymer Foam ◽  
Screw Extruder ◽  
Scanning Calorimetry ◽  
Blowing Agent ◽  
Foaming Process ◽  
Twin Screw

Polymer foam biocomposites based on polypropylene/rice straw (PP/RS) were successfully prepared by using an extrusion foaming process. The compounding of PP and RS was performed in a twin-screw extruder which was blended with crosslinker; dicumyl peroxide (DCP) and blowing agent; azodicarbonamide (AZ). The foam biocomposite was extruded at temperatures of 180, 190, 190 and 200 °C respectively, which set from the feeder until the die zone. The thermal properties were investigated by using differential scanning calorimetry (DSC).

Hexabenzocoronene with Swallow-Tailed Substitutes: Synthesis, Characterization and Properties

2011 ◽  
Vol 181-182 ◽  
pp. 147-150 ◽  
Author(s):  
Wen Qing Huang ◽  
Pei Pei Liu ◽  
Bing Bing Wang ◽  
Xu Ying Liu ◽  
Wen Guang Wang
Keyword(s):  
Differential Scanning Calorimetry ◽  
Thermal Properties ◽  
Optical Microscopy ◽  
Thermal Processing ◽  
Self Organization ◽  
Side Chains ◽  
Scanning Calorimetry ◽  
Polarized Optical Microscopy ◽  
Alkyl Chains

A hexa-peri-hexabenzocoronene (HBC) derivative, substituted at periphery by six swallow-tailed alkyl chains containing ether linkages, has been synthesized. Its thermal properties and self-organization were investigated using differential scanning calorimetry (DSC) and polarized optical microscopy (POM). Results showed that the peripheral side chains substituted to the aromatic core could lead the HBC to a dramatically lowered isotropization temperature compared with those reported previously, allowing thermal processing at practical temperatures.

scholarly journals Role of different lignin systems in polymers: mechanical properties and thermal stability

2020 ◽  
Vol 22 (4) ◽  
pp. 10-16
Author(s):  
Gvlmira Hasan ◽  
Dilhumar Musajan ◽  
Gong-bo Hou ◽  
Mingyu He ◽  
Ying Li ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Differential Scanning Calorimetry ◽  
Thermal Properties ◽  
Induction Time ◽  
Crystallization Rate ◽  
Scanning Calorimetry ◽  
Oxidation Induction Time ◽  
Thermal Stability Of

AbstractLignin was used to study the mechanical properties and thermal stability of polymers. The lignin was blended with three kinds of polymers, and the addition of lignin was 0.5 wt%. Under the condition of thermal oxidation, the thermal stability of lignin/polymer samples varies with the structure of lignin. The effects of lignin on the mechanical properties and thermal stability of the polymers were investigated by oxidation induction time (OIT), rheological properties, mechanical properties and differential scanning calorimetry (DSC). The results show that the effect of lignin on the thermal properties of polymer samples is 2~3°C. It can be inferred that lignin can effectively improve the interaction between polymer molecular chain segments, and improve the crystallization rate and rigidity to a certain extent, so it can be seen that lignin has good compatibility and thermal stability.

scholarly journals The influence of polymer on optical and thermal properties of nematic liquid crystals

2021 ◽  
Vol 2070 (1) ◽  
pp. 012055
Author(s):  
Santosh Mani ◽  
Pushpendra Rai ◽  
Samriti Khosla ◽  
Pradip Sarawade
Keyword(s):  
Differential Scanning Calorimetry ◽  
Thermal Properties ◽  
Liquid Crystal ◽  
Phase Separation ◽  
Contrast Ratio ◽  
Smart Window ◽  
Phase Boundaries ◽  
Scanning Calorimetry ◽  
Polarized Optical Microscopy ◽  
Polymerization Induced Phase Separation

Abstract Polymer is substance which consists of large number of molecules and plays a very important in our everyday life. In the present study the effect of different concentration of polymer Poly Methyl Methacrylate on the optical and thermal properties of nematic liquid crystal were investigated. The polymer was dispersed in the liquid crystal by polymerization induced phase separation method. The physical properties were investigated using differential scanning calorimetry and polarized optical microscopy. We found various textures according to the molecular order and orientation of the liquid crystal and polymer in constrained regions separated by phase boundaries. These composite materials can be used to enhance contrast ratio with more stability for display application and smart window.

A Comparative Study on the Effect of Adiabatic Extrusion by Twin-Screw Extruder to the Crystallization Pattern and Thermal Behavior of Polyamide 6/C20A Nanocomposites

2013 ◽  
Vol 756 ◽  
pp. 135-142 ◽  
Author(s):  
Zulhelmi Ismail ◽  
Kamal Yusoh
Keyword(s):  
Differential Scanning Calorimetry ◽  
Thermal Degradation ◽  
Polyamide 6 ◽  
Combination Effect ◽  
Gravimetric Analysis ◽  
Twin Screw Extruder ◽  
Screw Extruder ◽  
Scanning Calorimetry ◽  
Mass Losses ◽  
Twin Screw

The performance of an adiabatic extrusion in minimizing the risk of thermal degradation for PA6/C20A nanocomposites was investigated in this paper. The screw speed of twin-screw extruder was maintained at constant value of 100 RPM while the clay loadings C20A were varied between 1 wt %, 3wt % and 5 wt % respectively.Thermal gravimetric analysis was used to characterize the thermal property of polyamide6/C20A-nanocomposites and the crystallization pattern was thoroughly examined via the application of differential scanning calorimetry. The time taken for 10 wt.% mass losses of majority adiabatic extruded samples was observed to be longer as compared to the conventional extruded PA6/C20A samples. The combination effect of adiabatic extrusion and nanoclay presence in the PA6-matrix has managed to increase thermal resistant of PA6. The crystallinity grade for each of the samples with different loading of C20A. however has not diversed in value since the index of crystallinity (Xc) remains independent of C20-volume althoughconventional/adiabatic setting of extruder could possibly have greater effect on the crystalline feature of PA6/C20A nanocomposites.

scholarly journals Improved Processing and Properties for Polyphenylene Oxide Modified by Diallyl Orthophthalate Prepolymer

Polymers ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 2016
Author(s):  
Honghua Wang ◽  
Qilin Mei ◽  
Yujie Ding ◽  
Zhixiong Huang ◽  
Minxian Shi
Keyword(s):  
Differential Scanning Calorimetry ◽  
Thermal Properties ◽  
Phase Separation ◽  
Dilution Effect ◽  
Gradual Decrease ◽  
Gel Point ◽  
Dynamic Mode ◽  
Curing Process ◽  
Scanning Calorimetry ◽  
Polyphenylene Oxide

Diallyl orthophthalate (DAOP) prepolymer was investigated as a reactive plasticizer to improve the processability of thermoplastics. The rheology of blends of DAOP prepolymer initiated by 2,3-dimethyl-2,3-diphenylbutane (DMDPB) and polyphenylene oxide (PPO) was monitored during the curing process, and their thermal properties and morphology in separated phases were also studied. Differential scanning calorimetry (DSC) results showed that the cure degree of the reactively plasticized DAOP prepolymer was reduced with increasing PPO due to the dilution effect. The increasing amount of the DAOP prepolymer led to a gradual decrease in the viscosity of the blends and the rheology behavior was consistent with the chemical gelation of DAOP prepolymer in blends. This indicated that the addition of the DAOP prepolymer effectively improved processability. The phase separation occurring during curing of the blend and the transition from the static to dynamic mode significantly influences the development of the morphology of the blend corresponding to limited evolution of the conversion around the gel point.

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