Ultrasonic degradation of polysilane polymers

Zhou, Xiaodong; Qin, Lin; Dai, Guohao; Faxiang, Ji

doi:10.1016/s0141-3910(97)00101-8

Cited by 15 publications

(7 citation statements)

References 18 publications

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“…Degradation increases with prolonged ultrasonication time. Generally, polysaccharides with higher molecular weight are more easily degraded 16,19 . Modification of proteins by US is less studied.…”

Section: Introductionmentioning

confidence: 99%

Application of High-Intensity Ultrasounds to Control the Size of Whey Proteins Particles

Gordon

Pilosof

2010

Food Biophysics

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In this paper, we reported a new method to prepare whey protein microparticles via high-intensity ultrasound disruption. Particles morphology was characterized by confocal microscopy, and their size and distribution were analyzed by light scattering technique. Starting whey protein isolate (WPI) exhibited changes in size and distribution according to its concentration. For WPI, 7.5% (w/w) mean size was 0.7 µm, and upon sonication at ambient temperature, the size was reduced up to 0.2 µm showing the particles a rounded morphology. Sonication at room temperature of gelled WPI led to particles with sizes between 0.1 and 10 µm which had a tendency to flocculate. When WPI was submitted to sonication under heating at protein denaturation temperature, different effects were observed according to protein concentration. The particle size was reduced for the lowest WPI concentration (7.5 wt.%), did not change at 9 wt.%, but strongly increased at 12 wt.%, in comparison with the untreated sample. WPI particles of desired size in the micron range may be obtained either by sonication of gelled WPI or by sonication under heating at denaturation temperature by controlling processing variables.

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Section: Introductionmentioning

confidence: 99%

Application of High-Intensity Ultrasounds to Control the Size of Whey Proteins Particles

Gordon

Pilosof

2010

Food Biophysics

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“…In addition, the molecular weight distribution was markedly different in the sonochemical reaction 42. One possible explanation for this is that polymer chains, once formed, undergo the type of mechanical degradation described above, a process known to occur in PMPS 45, 46. Fig.…”

Section: Sonochemical Preparation Of Polyorganosilanesmentioning

confidence: 92%

Synthesis and modification of silicon‐containing polymers using ultrasound

Price¹

2009

Polymer International

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“…These transcrystalline regions further enhance the adhesion between the phases. [13,26] Figure 5(a, b, c, d) displays the surface morphology of C1, C2, C3, C4 composites. The pictures show the densely packed random fibres with good wetting of the fibres by the matrix.…”

Section: Dynamic Mechanical Propertiesmentioning

confidence: 99%

“…Although, these composites generally give excellent properties such as high strength and stiffness, the major disadvantage is environmental and ecological problems in mechanical and thermal recycling systems. [12][13][14][15] In addition, another problem with all composites made from components with different chemical structures is that they often have poor matrix-fibre adhesion and are difficult to recycle. [12,16] These problems can be overcome by composites where the fibre and matrix have the same chemical structure, such as PP.…”

Section: Introductionmentioning

confidence: 99%

“…[1,5,8] The dynamic properties are expressed in terms of storage modulus, loss modulus and damping or loss factor. [5,13,18] Several studies on PP fibre-reinforced composites based on structure-property relationship by means of dynamic and static stress mechanical analysis have been reported in the literature. [5,14,18,20] Experimental Part…”

Section: Introductionmentioning

confidence: 99%

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Morphology, Thermal and Mechanical Properties of Poly(propylene) Fibre‐Matrix Composites

Houshyar

Shanks

2003

Macro Materials & Eng

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Preparation and properties of poly(propylene)‐poly(propylene) composites have been investigated. Poly(propylene) fibres of varying diameter have been incorporated in a random ethylene co‐poly(propylene). The composites prepared from the same semi‐crystalline polymer in the matrix and reinforcement have lead to inherently strong interfacial bonding between the two phases of the same polymer. The composites demonstrated enhanced stiffness, which increased with fibre diameter. The structure, thermal, static and mechanical properties of poly(propylene) long fibre reinforced random co‐poly(propylene) composites have been studied with reference to the fibre diameter. The matrix and fibre components retained their separate melting temperatures. After melting, the two phases remained separate and showed their individual crystallization temperatures on cooling, and melting temperatures on a second heating. The melting temperature of the poly(propylene) fibres increased after formation of the composites. The compression molding of the composites at a temperature below the melting temperature of the fibres caused annealing of the fibre crystals. By incorporation of long poly(propylene) fibre into random co‐poly(propylene), the glass transition, storage and static modulus have been found to be increasing and composite with the largest fibre diameter shows better properties. Transcrystallization of the matrix poly(propylene) was observed.Optical microscopy of composites with fibre diameter 68 μm.magnified imageOptical microscopy of composites with fibre diameter 68 μm.

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Ultrasonic degradation of polysilane polymers

Cited by 15 publications

References 18 publications

Application of High-Intensity Ultrasounds to Control the Size of Whey Proteins Particles

Application of High-Intensity Ultrasounds to Control the Size of Whey Proteins Particles

Synthesis and modification of silicon‐containing polymers using ultrasound

Morphology, Thermal and Mechanical Properties of Poly(propylene) Fibre‐Matrix Composites

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