Effects of Amino-Functionalized Carbon Nanotubes on the Crystal Structure and Thermal Properties of Polyacrylonitrile Homopolymer Microspheres

Zhang, Hailong; Quan, Ling

doi:10.3390/polym9080332

Cited by 13 publications

(13 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As illustrated, Fig. a depicts the cauliflower like architecture, formed by the interconnected arrangement of PAN latexes . Actually, the fibrous PAN latexes are evolved as connected cauliflower like microspheres during emulsifier‐free emulsion polymerization of pure PAN.…”

Section: Resultsmentioning

confidence: 99%

Effect of layered graphene oxide on the structure and properties of bovine serum albumin grafted polyacrylonitrile hybrid bionanocomposites

2019

View full text Add to dashboard Cite

Herein, one‐pot synthetic protocol is utilized to synthesize graphene oxide (GO) reinforced bovine serum albumin grafted polyacrylonitrile (BSA‐g‐PAN) microspheres through emulsifier‐free in situ emulsion polymerization route by using potassium persulfate (KPS) as initiator. The surface morphologies of pure PAN, BSA‐g‐PAN hybrid polymer, and BSA‐g‐PAN/GO hybrid bionanocomposites are observed through scanning electron microscope. Pure PAN shows the self‐assembled cauliflower like morphology which is found to be structurally interfered due to grafting between BSA and PAN. Moreover, the growth of cauliflower like morphology is influenced by the incorporation of GO platelets within BSA‐g‐PAN matrix, due to strong interfacial adhesion between GO and PAN. Transmission electron microscopy, X‐ray diffraction, and atomic force microscopy techniques are used to evaluate structural distributions of layered GOs within BSA‐g‐PAN chains. Due to filling up of microvoids of BSA‐g‐PAN structure by the GO layers, the oxygen permeability of the hybrid bionanocomposite is reduced by 22 folds with incorporation of only 3 wt% of GO. Moreover, the BSA‐g‐PAN/GO hybrid bionanocomposite shows significant antibacterial activities against bacteria such as S. aureus and E. coli. Primarily, thermal, gas barrier, biodegradability, antimicrobial, and mechanical properties of the synthesized hybrid bionanocomposites are studied to explore the hybrid bionanocomposite in packaging applications. POLYM. COMPOS., 40:3989–4003, 2019. © 2019 Society of Plastics Engineers

show abstract

Section: Resultsmentioning

confidence: 99%

Effect of layered graphene oxide on the structure and properties of bovine serum albumin grafted polyacrylonitrile hybrid bionanocomposites

2019

View full text Add to dashboard Cite

show abstract

“…Figure 10 shows the DSC curves of the PAN precursor fibers and the amino-CNT/PAN composite fibers under a nitrogen atmosphere at heating rate 10 °C/min. An intensive peak was exhibited in the temperature range 250~310 °C, which was attributed to the exothermic peak of cyclization reaction [ 33 , 56 ]. The amino-CNT/PAN composite fibers show lower intensive value and earlier maximum temperature of exothermic peak than the control PAN precursor fibers.…”

Section: Resultsmentioning

confidence: 99%

“…Co. Ltd. (Shenzhen, China), which diameter and length is about 10–15 nm and 1–10 μm according to the supplier’s specification, respectively. Amino-CNTs were obtained by a series of chemical methods, which could be seen in our previous publication [ 33 , 34 ]. The pristine CNTs firstly need to be purified to remove the metallic catalysts, and then were modified through the 30% H 2 O 2 solution to obtain the functionalized CNTs with carboxylic acid.…”

Section: Methodsmentioning

confidence: 99%

Rheological Behavior of Amino-Functionalized Multi-Walled Carbon Nanotube/Polyacrylonitrile Concentrated Solutions and Crystal Structure of Composite Fibers

et al. 2018

Self Cite

View full text Add to dashboard Cite

Abstract:The rheological behavior of amino-functionalized multi-walled carbon nanotubes (amino-CNTs)/polyacrylonitrile (PAN) concentrated solutions in the dimethyl sulphoxide solvent and the effects of the amino-CNTs on the PAN precursor fibers by wet-spinning method were investigated. The amino-CNT/PAN concentrated solutions prepared by in situ solution polymerization with homogeneous dispersion of amino-CNTs have higher complex viscosity, storage modulus and loss modulus as compared to the control PAN concentrated solutions containing 22% PAN polymer by mass. The composite fibers with amino-CNTs of 1 wt % have lower degree of crystallization, crystal size and crystal region orientation compared to the control PAN precursor fibers. However, the amino-CNT/PAN composite fibers with diameter of about 10.5 µm exhibit higher mechanical properties than the control PAN precursor fibers with diameter of about 8.0 µm. Differential scanning calorimetry analysis demonstrated that the cyclization reaction in composite fibers have broad exothermic temperature range and low exothermic rate. These results indicate that the addition of amino-CNTs into PAN precursor fibers is beneficial to controlling the process of thermal stabilization and obtaining the higher performance of composite fibers.

show abstract

“…When the molar ratio content of IA comonomer increases from 0.5 to 1.0, PAN-IA1.0 copolymers have a lower degree of crystallinity and crystal size than PAN-IA0.5 copolymers. These results are attributed to the ability of the IA comonomer to disrupt the regular macromolecular structure of the macromolecular chains of PAN [39].…”

Section: Xrd Analysismentioning

confidence: 99%

“…• is assigned to the (100) crystal plane of hexagonal lattice for the PAN polymer [39]. The degree of crystallinity (C%) was determined by the integral area of the crystalline zone and the amorphous zone according to the following formula:…”

Section: Characterizationmentioning

confidence: 99%

Thermal Analysis and Crystal Structure of Poly(Acrylonitrile-Co-Itaconic Acid) Copolymers Synthesized in Water

et al. 2020

Self Cite

View full text Add to dashboard Cite

The composition and structure of polyacrylonitrile (PAN) precursors play an important role during thermal stabilization, which influences the properties of the resulting carbon fibers. In this paper, PAN homopolymer and PAN-itaconic (IA) copolymers with different IA contents were synthesized by aqueous phase precipitation polymerization. The effects of IA content on the structure and thermal properties were studied using scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA). The morphology of PAN polymers showed that the average size of the PAN particles increased with the increase of IA content in the feed. The content of the IA comonomer on the copolymers was quantitatively characterized by the relative absorbance intensity (A1735/A2243) in FTIR spectrum. With the increase of IA content in the feed, PAN-IA copolymers exhibited lower degree of crystallinity and crystal size than the control PAN homopolymer. The results from DSC curves indicated that PAN-IA1.0 copolymers had lower initial exothermic temperature (192.4 °C) and velocity of evolving heat (6.33 J g−1 °C−1) in comparison with PAN homopolymer (Ti = 238.1 °C and ΔH/ΔT = 34.6 J g−1 °C−1) in an air atmosphere. TGA results suggested that PAN-IA1.0 copolymers had higher thermal stability than PAN homopolymer, which can form a ladder structure easier during thermal processing. Therefore, PAN-IA1.0 copolymers would be a suitable candidate for preparing high performance PAN based carbon fibers.

show abstract

Effects of Amino-Functionalized Carbon Nanotubes on the Crystal Structure and Thermal Properties of Polyacrylonitrile Homopolymer Microspheres

Cited by 13 publications

References 41 publications

Effect of layered graphene oxide on the structure and properties of bovine serum albumin grafted polyacrylonitrile hybrid bionanocomposites

Effect of layered graphene oxide on the structure and properties of bovine serum albumin grafted polyacrylonitrile hybrid bionanocomposites

Rheological Behavior of Amino-Functionalized Multi-Walled Carbon Nanotube/Polyacrylonitrile Concentrated Solutions and Crystal Structure of Composite Fibers

Thermal Analysis and Crystal Structure of Poly(Acrylonitrile-Co-Itaconic Acid) Copolymers Synthesized in Water

Contact Info

Product

Resources

About