A comparison of degree of properties enhancement produced by thermal annealing between polyethylene and calcium carbonate–polyethylene composites

Tiemprateeb, S.; Hemachandra, K.; Suwanprateeb, Jintamai

doi:10.1016/s0142-9418(98)00099-3

Cited by 11 publications

(5 citation statements)

References 12 publications

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“…Thermal annealing has been employed as a processing strategy to alter the microstructure of polymeric materials, most often to increase the crystallinity or to modulate microphase separation in order to improve material or application dependent properties, including strength or stiffness [23–25], hardness [23], viscoelastic properties [26, 27], water absorptive properties [26, 28], or photoluminescence [28]. In particular, thermal annealing for one hour at 160°C of polyvinyl alcohol (PVA) hydrogels resulted in increased creep resistance and decreased water content which was attributed to a thermally induced change in microstructure initiating a collapse in hydrogel pore structure [26, 29, 30].…”

Section: Resultsmentioning

confidence: 99%

A Permanent Change in Protein Mechanical Responses Can be Produced by Thermally-Induced Microdomain Mixing

Sallach

Leisen

Caves

et al. 2009

Journal of Biomaterials Science, Polymer Edition

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Electrospinning was employed to fabricate three dimensional fiber networks from a recombinant amphiphilic elastin-mimetic triblock protein polymer and the effects of moderate thermal conditioning (60°C, 4h) on network mechanical responses investigated. Significantly, while cryo-high resolution scanning electron microscopy (cryo-HRSEM) revealed that macroscopic and microscopic morphology of the network structure was unchanged, solid-state 1H NMR spectroscopy demonstrated enhanced interphase mixing of hydrophobic and hydrophilic blocks. Significantly, thermal annealing triggered permanent changes in network swelling behavior (28.75 ± 2.80 non-annealed vs. 13.55 ± 1.39 annealed; p < 0.05) and uniaxial mechanical responses, including Young’s modulus (0.170 ± 0.010 MPa non-annealed vs. 0.366 ± 0.05 MPa annealed; p < 0.05) and ultimate tensile strength (0.079 ± 0.008 MPa vs 0.119 ± 0.015 MPa; p < 0.05). To our knowledge, these investigations are the first to note that mechanical responses of protein polymers can be permanently altered through a temperature-induced change in microphase mixing.

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Section: Resultsmentioning

confidence: 99%

A Permanent Change in Protein Mechanical Responses Can be Produced by Thermally-Induced Microdomain Mixing

Sallach

Leisen

Caves

et al. 2009

Journal of Biomaterials Science, Polymer Edition

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“…The properties of particulate filled polymer composites depended on the particle size, shape, loading, the dispersion of the nanoparticles in the polymer matrix, and good adhesion at the interface surfaces 11–14. Among the various mineral fillers, calcium carbonate (CaCO 3 ),15–20 zinc oxide (ZnO),21–24 and titanium dioxide (TiO 2 )25–29 have been among the most utilized nanomaterials. CaCO 3 has been used because of its low cost, and TiO 2 has been mainly used as a white pigment, due to its brightness.…”

Section: Introductionmentioning

confidence: 99%

Effects of particle type on thermal and mechanical properties of polyoxymethylene nanocomposites

Wacharawichanant

Sangkhaphan

Sa-Nguanwong

et al. 2011

J of Applied Polymer Sci

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The effects of particle size of titanium dioxide (TiO 2 ) on mechanical, thermal, and morphological properties of pure polyoxymethylene (POM) and POM/TiO 2 nanocomposites were investigated and compared with the results for nanoparticle ZnO in the same matrix, reported in a previous paper. POM/TiO 2 nanocomposites with varying concentration of TiO 2 were prepared by the melt mixing technique in a twin screw extruder, the same method that used for blending the homogeneous ZnO nanocomposites. The dispersion of TiO 2 particles in POM nanocomposites was studied by scanning electron microscopy (SEM). The agglomeration, as observed by the mechanical properties of TiO 2 particles in the polymer matrix, increased with increasing TiO 2 content, a result not found for ZnO even at lower particle sizes. Increasing the filler content of POM/TD32.4 and POM/TD130 (130 nm) nanocomposites resulted in a decrease in tensile strength. The Young modulus, stress at break and impact strength of TiO 2 nanocomposite did not improve with increasing filler contents, in opposition to the better agglomeration conditions of ZnO nanocomposite even at lower particle sizes. Because of agglomeration, the POM/ TD32.4 nanocomposites had lower mechanical properties and lower degradation temperature than the POM/TD130 ones. The sizes of nanoparticles determined the agglomeration, but however, the agglomeration also depended on the type of nanoparticles, even when using the same matrix (POM) and the same mixing method. TiO 2 nanoparticles were more difficult to mix and were more agglomerated in the POM matrix as compared to ZnO nanoparticles, regardless of the size of the nanoparticles.

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“…In this case, we could not affirm that there is significant difference in the crystallinity degree. Tiemprateeb et al 34 also observed that cristallinity fo PE remain comparatively constant for different CaCO 3 content. Huang et al suggested 35 that microparticles can nucleate because they can provide sufficiently large flat domains, whereas the size of microparticles is comparable to the spherulite size of PE and thus also hinder the spherulite growing, so the degree of crystallinity in microcomposites is not significantly larger than that of the neat LDPE Figures 2 and 3 illustrate the optical and SEM micrographs of the external surface and the cross section of rotomolded composites, respectively.…”

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confidence: 88%

Influence of calcium carbonate and slip agent addition on linear medium density polyethylene processed by rotational molding

2013

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In this paper, the influence of calcium carbonate and slip agent on linear medium density polyethylene (LMDPE) processed by rotational molding was evaluated. LMDPE was dry blended with different CaCO 3 masterbatch ratios, erucamide slip agent and then extruded, micronized and rotomolded. The powder samples were characterized using MFI (Melting flow index), dry flow and bulk density. The characterization of rotomolded samples properties was performed by DSC (Differential scanning calorimetry), microscopy analysis, izod impact and tensile test. The results pointed out that the CaCO 3 addition modifies the bulk density compared to neat LMDPE, but did not significantly affect the dry flow and MFI. The erucamide addition decreased the dry flow and increased the bulk densities. The porosity degree data showed that CaCO 3 addition in the LMDPE increased the quantity of pores. The DSC results showed no significant difference in the crystallinity degree. The behavior of porosity led to a decrease in the mechanical properties of LMDPE with the CaCO 3 addition.

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A comparison of degree of properties enhancement produced by thermal annealing between polyethylene and calcium carbonate–polyethylene composites

Cited by 11 publications

References 12 publications

A Permanent Change in Protein Mechanical Responses Can be Produced by Thermally-Induced Microdomain Mixing

A Permanent Change in Protein Mechanical Responses Can be Produced by Thermally-Induced Microdomain Mixing

Effects of particle type on thermal and mechanical properties of polyoxymethylene nanocomposites

Influence of calcium carbonate and slip agent addition on linear medium density polyethylene processed by rotational molding

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