scholarly journals Effects of Poly(ethylene-co-glycidyl methacrylate) on the Microstructure, Thermal, Rheological, and Mechanical Properties of Thermotropic Liquid Crystalline Polyester Blends

Polymers ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 2124
Author(s):  
Sang Hoon Lee ◽  
Ha-Bin Jeon ◽  
Gyu-Hyun Hwang ◽  
Young Seung Kwon ◽  
Ji-Su Lee ◽  
...  
Keyword(s):  
Glycidyl Methacrylate ◽  
Liquid Crystalline ◽  
Hydroxyl Groups ◽  
Sem Images ◽  
Shear Moduli ◽  
Melt Compounding ◽  
Grafting Reactions ◽  
Ft Ir ◽  
Poly Ethylene ◽  
Liquid Crystalline Polyester

In this study, a series of thermotropic liquid crystalline polyester (TLCP)-based blends containing 1–30 wt% poly(ethylene-co-glycidyl methacrylate) (PEGMA) were fabricated by masterbatch-assisted melt-compounding. The scanning electron microscopy (SEM) images showed a uniformly dispersed microfibrillar structure for the TLCP component in cryogenically-fractured blends, without any phase-separated domains. The FT-IR spectra showed that the carbonyl stretching bands of TLCP/PEGMA blends shifted to higher wavenumbers, suggesting the presence of specific interactions and/or grafting reactions between carboxyl/hydroxyl groups of TLCP and glycidyl methacrylate groups of PEGMA. Accordingly, the melting and crystallization temperatures of the PEGMA component in the blends were greatly lowered compared to the TLCP component. The thermal decomposition peak temperatures of the PEGMA and TLCP components in the blends were characterized as higher than those of neat PEGMA and neat TLCP, respectively. From the rheological data collected at 300 °C, the shear moduli and complex viscosities for the blend with 30 wt% PEGMA were found to be much higher than those of neat PEGMA, which supports the existence of PEGMA-g-TLCP formed during the melt-compounding. The dynamic mechanical thermal analysis (DMA) analyses demonstrated that the storage moduli of the blends decreased slightly with the PEGMA content up to 3 wt%, increased at the PEGMA content of 5 wt%, and decreased again at PEGMA contents above 7 wt%. The maximum storage moduli for the blend with 5 wt% PEGMA are interpreted to be due to the reinforcing effect of PEGMA-g-TLCP copolymers.

scholarly journals Effects of Treatment Temperature on Properties of Starch-based Adhesives

BioResources ◽  
2015 ◽  
Vol 10 (2) ◽  
pp. 3520-3530 ◽  
Author(s):  
Hongwei Yu ◽  
Yuan Cao ◽  
Qun Fang ◽  
Zhikun Liu
Keyword(s):  
Polyvinyl Alcohol ◽  
Bond Strength ◽  
Corn Starch ◽  
Treatment Temperature ◽  
Hydroxyl Groups ◽  
X Ray Diffraction ◽  
Sem Images ◽  
Ft Ir ◽  
Acidic Conditions ◽  
Ft Ir Spectroscopy

Starch-based adhesives were developed by hydrolyzing starch with polyvinyl alcohol under alkaline and acidic conditions at various treatment temperatures. The chemical and physical structures of the corn starch and hydrolyzed starch were characterized with Fourier Transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), and scanning electronic microscopy (SEM). Thermal degradation and bond strength were also evaluated. The results indicated that the bond strength of starch adhesives reached a maximum value at 40 °C. The FI-IR results showed that the amount of hydroxyl groups first increased and then decreased with increasing treatment temperature. When the treatment temperature was 55 °C the crystallinity of treated starch was the lowest and the thermal resistance also the weakest; it decreased by 10.1% and 13.6% respectively compared to untreated starch. Obvious erosion could be observed from the SEM images of treated starch. In addition, the interaction of polyvinyl alcohol (PVA) and starch also could be observed, and the results indicated that the compatibility between starch and PVA became better and better as the treated temperature was increased.

Influence of Poly (Ethylene Glycol) and Oleylamine on the Formation of Nano to Micron Size Spherical SiO2 Particles

2012 ◽  
Vol 521 ◽  
pp. 163-169 ◽  
Author(s):  
Abdelaziz Rahy ◽  
S.J. Hong ◽  
Kap Seung Yang ◽  
Christopher Bunker ◽  
Mallikarjuna N. Nadagouda ◽  
...  
Keyword(s):  
Silica Particles ◽  
Ir Absorption ◽  
Poly Ethylene Glycol ◽  
Structural And Optical Properties ◽  
Synthesis System ◽  
Sem Images ◽  
Micron Size ◽  
Homogeneous Particle ◽  
Ft Ir ◽  
Poly Ethylene

We report an eco-friendly synthesis of well–controlled, nano-to-micron-size, spherical SiO2particles using non-hazardous solvent and a byproducts-producing system. It was found that the morphology and size of spherical SiO2particles are controlled by adjusting the concentration of PEG and oleylamine, ethanol solvent selection, and reaction temperature. The SEM images show spherical-shaped silica particles with homogeneous particle-size distribution. Structural and optical properties of the silica particles were investigated by FT-IR absorption spectroscopy and photoluminescence. The resultant SiO2particles from the synthesis system were easily dispersed in both water and organic solvent.

Reactive Grafting of Glycidyl Methacrylate onto Poly (Ethylene-1-Octene)

2011 ◽  
Vol 239-242 ◽  
pp. 1153-1158 ◽  
Author(s):  
Hui Ju Shao ◽  
Jian Bing Guo ◽  
Yang Jun Li ◽  
Jie Yu ◽  
Shu Hao Qin
Keyword(s):  
Fourier Transform ◽  
1H Nmr ◽  
Infrared Spectra ◽  
Glycidyl Methacrylate ◽  
Nmr Spectra ◽  
Fourier Transform Infrared ◽  
Dicumyl Peroxide ◽  
Melt Grafting ◽  
Ft Ir ◽  
Poly Ethylene

Poly (ethylene-1-octene) (POE) was functionalized to varying degrees with glycidyl methacrylate (GMA) by melt grafting processes. Fourier transform infrared spectra (FT-IR) and 1H NMR spectra confirmed that glycidyl methacrylate was successfully grafted onto the POE. When dicumyl peroxide(DCP)concentration was around 4‰ high graft degree was obtained. The data from GPC measure demonstrates that POE chains degraded during grafting process.

Investigations on Poly(Ethylene glycol) Modified P2O5-CaO-SiO2 Gel Bioglass

2011 ◽  
Vol 287-290 ◽  
pp. 1966-1969
Author(s):  
Qun Ying Fan ◽  
Wei Liu ◽  
Miao Feng ◽  
Hong Bing Zhan
Keyword(s):  
Ethylene Glycol ◽  
Aqueous Solubility ◽  
High Porosity ◽  
Sem Images ◽  
Three Samples ◽  
Ft Ir ◽  
Poly Ethylene ◽  
Gel Glasses ◽  
Hierarchical Pore ◽  
Adsorption Desorption

We report the synthesis and characterizations of Poly(ethylene glycol) (PEG) modified P2O5-CaO-SiO2 gel bioglass. Three kinds of PEG with different molecular weight (400，6 000，10 000) were used in the preparation and their influence on the nanostructure of the resultant gel bioglasses was investigated. Due to the excellent aqueous solubility and compatibility of PEG with the inorganic P2O5-CaO-SiO2 components, no phase separation was detected in the hybrid gel glasses under scanning electron microscopy (SEM) observation. FT-IR spectra indicate that hybridization between the organic and inorganic part was successfully achieved at the molecular level. SEM images and N2 adsorption-desorption experiments show that, among the three samples, S6 000 is the most promising candidate for bone scaffold material, because of its hierarchical pore structure, high porosity and surface area.

Toughened Poly(Trimethylene Terephthalate) by Reactive Blending with PTW

2018 ◽  
Vol 777 ◽  
pp. 70-74
Author(s):  
Kun Yan Wang
Keyword(s):  
Fracture Toughness ◽  
Impact Strength ◽  
Glycidyl Methacrylate ◽  
Epoxy Group ◽  
Hydroxyl Groups ◽  
Reactive Blending ◽  
Izod Impact ◽  
Trimethylene Terephthalate ◽  
Poly Ethylene ◽  
Fractured Surface

New toughened poly (trimethylene terephthalate) (PTT) materials were obtained by reactive blending with poly (ethylene-butylacrylate-glycidyl methacrylate) (PTW). Morphology observation showed the well-dispersed domains of PTW in PTT matrix. The notched impact strength of the blends with 30wt% PTW is obviously higher than that of pure PTT. PTT-g-PTW copolymer as compatibilizer was formed by the interfacial reaction between the end epoxy group of PTW and the carboxylic or hydroxyl groups at the chain ends of PTT in the blends. Large number of stretched polymeric fibrils are uniformly distributed on the Izod impact fractured surface, which leads to an improvement in fracture toughness due to the consumption of fracture energy.

scholarly journals Synthesis and characterization of indium tin oxide nanoparticles via reflux method

2018 ◽  
Vol 35 (4) ◽  
pp. 799-805 ◽  
Author(s):  
Sahebali Manafi ◽  
Simin Tazikeh ◽  
Sedigheh Joughehdoust
Keyword(s):  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Oxide Nanoparticles ◽  
Hydroxyl Groups ◽  
Sem Images ◽  
Tin Chloride ◽  
Ft Ir ◽  
Tin Oxide Nanoparticles ◽  
Ito Nanoparticles ◽  
Indium Tin Oxide Nanoparticles

Abstract Synthesis of indium tin oxide (ITO) nanoparticles by reflux method without chlorine contamination at different pHs, temperatures, solvents and concentrations has been studied. Indium chloride, tin chloride, water, ethanol and Triton X-100 were used as starting materials. Structure, size, surface morphology and transparency of indium tin oxide nanoparticles were studied by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM) and UV-Vis spectrophotometry. XRD patterns showed that 400 °C is the lowest temperature for synthesis of ITO nanoparticles because metal hydroxide does not transform to metal oxide in lower temperature. FT-IR results showed the transformation of hydroxyl groups to oxide. SEM images showed that pH is the most important factor affecting the nanoparticles size. The smallest nanoparticles (40 nm) were obtained at pH = 8.8. The size of crystallites was decreased by lowering of concentration (0.025 M).

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