Morphology and thermal behaviour of SAN/EPDM blends

Ptiček, Anita; Hrnjak-Murgić, Zlata; Jelenčić, Jasenka; Mlinac-Mišak, Marica

doi:10.3144/expresspolymlett.2007.52

Cited by 9 publications

(8 citation statements)

References 27 publications

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“…Differential scanning calorimetry is a helpful technique in characterization of melting and crystallization behavior of blend films. When a blend is composed of amorphous polymers, the presence of single or separate glass transitions can be a decisive factor in evaluating miscibility of the polymers, but for blends in which one or both components are able to crystallize, the data's interpretation becomes more complicated 14, 32–34. DSC thermograms of films of blends of a wide range of compositions were obtained at a heating rate of 10°C and are shown in Figure 1.…”

Section: Resultsmentioning

confidence: 99%

Study of the thermal and mechanical properties of blown films of high‐ and low‐density polyethylene blends

Mohammadi

Yousefi

Ehsani

2011

J of Applied Polymer Sci

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The miscibility of the blown film of low‐ and high‐density polyethylene blends and its implications on melting, crystallization, and mechanical behavior throughout the full composition range and the possible role of blending on the miscibility of the binary pair system have been investigated. Using differential scanning calorimetry it was inferred that the films of blends in solid state are miscible in HDPE‐rich compositions, partially miscible at 95% LDPE and completely immiscible at other compositions. The thermal analysis revealed that blending has insignificant effect on lamella thickness of LDPE phase but strong influence on the lamella thickness of HDPE phase. Moreover, analysis of crystallization exotherms was also discussed. XRD measurements also revealed qualitatively similar trend in crystallinity and lamella thickness to DSC results. Measurements on tensile properties in the machine direction of the films showed both positive and negative deviation from linear additivity and improvement of the mechanical properties was found in the film blends containing low amount of LDPE. Especially the strain at break and tensile strength for the film of 5% LDPE blend was higher than that of neat HDPE, which suggests synergistic effects. This supports its larger lamella thickness and better miscibility. Nonetheless, there was negative deviation from the additivity rule in the entire range of composition for the mechanical properties in the transverse direction of the films. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012

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Section: Resultsmentioning

confidence: 99%

Study of the thermal and mechanical properties of blown films of high‐ and low‐density polyethylene blends

Mohammadi

Yousefi

Ehsani

2011

J of Applied Polymer Sci

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“…In the FTIR analysis of the HDI trimer, the stretching vibration absorption of CO occurred at 1700 cm –1 . , The equivalent CO absorption in HMP was located at the same place, although the peak was more intense (Figure ). 2270 cm –1 is −NCO of HDI trimer and HMP.…”

Section: Resultsmentioning

confidence: 98%

Synthesis and Characterization of Halogen-Free Flame Retardant Two-Component Waterborne Polyurethane by Different Modification

Yin

Luo

2017

Ind. Eng. Chem. Res.

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Diethyl N,N-bis(2-hydroxyethyl)aminomethylphosphonate and halogen-free poly(phosphate) as reactive halogen-free flame retardants and soft or hard segment modifiers were compounded to waterborne polyurethane polyols after being emulsified and then were mixed with isophorone diisocyanate and dimethylolpropionic acid to synthesize two-component waterborne polyurethanes having fire resistance. As a result, the rheological behavior of prepolymer emulsion really accords with characteristics of non-Newtonian fluid. The highest limit oxygen index is 27.8% in two-component system modified by hard segment, which was 527.5% than the clean; meanwhile, one is 28.6% in another two-component system, which was 627.6% than the clean. The hardness, solvent resistance, and mechanical property in both of the two-component systems are outstanding. Adding flame retardant can effectively improve the flame resistance, tensile strength, and pot-life of two-component waterborne polyurethanes, especially in being modified by soft segment.

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“…Road dust contains MNPs resulting from tire degradation , that are composed of natural and synthetic rubbers , and nylon . Synthetic rubbers are used to enhance tire cushioning and elasticity, while nylon is used in tire inner liners.…”

Section: Results and Discussionmentioning

confidence: 99%

Using Infrared Photothermal Heterodyne Imaging to Characterize Micro- and Nanoplastics in Complex Environmental Matrices

Kniazev

Pavlovetc

Zhang

et al. 2021

Environ. Sci. Technol.

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A key challenge for addressing micro-and nanoplastics (MNPs) in the environment is being able to characterize their chemical properties, morphologies, and quantities in complex matrices. Current techniques, such as Fourier transform infrared spectroscopy, provide these broad characterizations but are unsuitable for studying MNPs in spectrally congested or complex chemical environments. Here, we introduce a new, superresolution infrared absorption technique to characterize MNPs, called infrared photothermal heterodyne imaging (IR-PHI). IR-PHI has a spatial resolution of ∼300 nm and can determine the chemical identity, morphology, and quantity of MNPs in a single analysis with high sensitivity. Specimens are supported on CaF 2 coverslips under ambient conditions from where we (1) quantify MNPs from nylon tea bags after steeping in ultrapure water at 25 and 95 °C, (2) identify MNP chemical or morphological changes after steeping at 95 °C, and (3) chemically identify MNPs in sieved road dust. In all cases, no special sample preparation was required. MNPs released from nylon tea bags at 25 °C were fiber-like and had characteristic IR frequencies corresponding to thermally extruded nylon. At 95 °C, degradation of the nylon chemical structure was observed via the disappearance of amide group IR frequencies, indicating chain scission of the nylon backbone. This degradation was also observed through morphological changes, where MNPs altered shape from fiber-like to quasi-spherical. In road dust, IR-PHI analysis reveals the presence of numerous aggregate and single-particle (<3 μm) MNPs composed of rubber and nylon.

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Morphology and thermal behaviour of SAN/EPDM blends

Cited by 9 publications

References 27 publications

Study of the thermal and mechanical properties of blown films of high‐ and low‐density polyethylene blends

Study of the thermal and mechanical properties of blown films of high‐ and low‐density polyethylene blends

Synthesis and Characterization of Halogen-Free Flame Retardant Two-Component Waterborne Polyurethane by Different Modification

Using Infrared Photothermal Heterodyne Imaging to Characterize Micro- and Nanoplastics in Complex Environmental Matrices

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