Effect of morphology, crosslink density, and miscibility on interpenetrating polymer network damping effectiveness

Fay, J. J.; Murphy, Charles J.; Thomas, Dave; Sperling, L. H.

doi:10.1002/pen.760312407

Cited by 89 publications

(73 citation statements)

References 21 publications

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“…Thus, the mechanical loss that overcame the friction of intermolecular chain was reduced with silk fiber additives [15,16]. It was also claimed in another literature that the reduction in tan δ denoted the improvement in hysteresis of the system and a reduction in internal friction [17].…”

Section: Dynamic Mechanical Propertiesmentioning

confidence: 88%

A potential material for tissue engineering: Silkworm silk/PLA biocomposite

Cheung

Lau

Tao

et al. 2008

Composites Part B: Engineering

189

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Poly(lactic acid) (PLA), a kind of well recognized bio-degradable polymer, was reinforced by silkworm silk fibers to form a completely biodegradable and biocompatible biocomposite for tissue engineering applications. The influence on the mechanical and thermal properties of the biocomposite in relation to the length and weight content of silk fibers is studied in this paper. Through the micro-hardness test, optimized fiber length and weight content of silk fibers used to make a better strength silk fiber/PLA biocomposite was determined. Tensile property test and thermal analyses including differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA) and thermogravimetry analysis (TGA) for the silk fiber/PLA biocomposite with specified fiber length and weight content were then conducted to investigate its property changes in comparison to a pristine PLA sample.Experimentally, it was found that the fiber length and weight content of silk fibers are key parameters that would substantially influence the hardness of the biocomposite samples. For microscopic observations, good wettability of the fibers inside the biocomposite was seen. The surface of the fibers was well bonded with the matrix, as observed by a SEM image of fractured sample. As a result, it was found that the use of silk fibers can be a good candidate, as reinforcements for the development of polymeric scaffolds for tissue engineering applications.

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Section: Dynamic Mechanical Propertiesmentioning

confidence: 88%

A potential material for tissue engineering: Silkworm silk/PLA biocomposite

Cheung

Lau

Tao

et al. 2008

Composites Part B: Engineering

189

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“…It has been shown 3,7,22 that the morphology of IPN systems, at a given composition, is controlled by the chemical miscibility of the two components, interfacial tension, and crosslink densities. This last factor is, in turn, ultimately related to the percent of crosslinker used as well as the method of synthesis.…”

Section: Morphology and Graft Ipn Mechanismmentioning

confidence: 99%

Epoxy/castor oil graft interpenetrating polymer networks

Raymond

Bui

1998

J. Appl. Polym. Sci.

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Full-interpenetrating polymer networks (IPNs) were prepared from epoxy and castor oil-based polyurethane (PU), by the sequential mode of synthesis and were characterized by different techniques: swelling test, scanning electron microscopy (SEM), thermomechanical analysis (TMA), thermogravimetric analysis (TGA), tensile test, and instrumented impact test. 2,4-Toluene diisocyanate (TDI) was used as a curing agent for castor oil, at a NO/OH ratio ϭ 1.50. Diglycidyl ether of bisphenol A (DGEBA) was cured and crosslinked using 2,4,6-tris(dimethylaminomethyl)phenol (TDMP) at 1.5%, by weight, of epoxy resin. The homogeneous morphology of IPN samples of PU compositions up to 40%, by weight, revealed by SEM may be attributed to some extent to grafting of the PU phase onto the epoxy matrix, which results from the reaction between NCO groups in the PU phase with OH groups in the epoxy matrix. This has some synergistic effect on the thermal resistance and tensile properties of IPNs compared to those of the pure components, such as illustrated by the data from TGA and tensile tests. However, the grafting structure appears not to enhance their impact resistance, which probably requires the formation of rubbery particles of suitable size.

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“…Temperature curve (TA; the area under the tan d versus temperature curve) is commonly used for characterizing the damping properties of rubber. 19 The larger the TA value, the better the damping properties of material. The TA values in Table I show that when the AO-60 amount increases from 0 phr to 80 phr, the TA value of NBR/AO-60 composites increases from 32.9 C to 51.5 C. Both the loss peak and TA values indicate that the damping properties of NBR/AO-60 composites improve with increasing AO-60 content.…”

mentioning

confidence: 99%

Structure and dynamic properties of nitrile‐butadiene rubber/hindered phenol composites

Zhao

Cao

Zou

et al. 2011

J of Applied Polymer Sci

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ABSTRACT:Crosslinked nitrile-butadiene rubber (NBR)/hindered phenol composites were successfully prepared by mixing tetrakis [methylene-3-(3-5-ditert-butyl-4-hydroxy phenyl) propionyloxy] methane (AO-60) into NBR with 35% acrylonitrile mass fraction. The structural and mechanical properties of the NBR/AO-60 composites were systematically investigated by using differential scanning calorimeter, XRD, Fourier transform infrared, scanning electronic microscope, dynamic mechanical analyzer, and tensile testing. The results indicated that the AO-60 changed from crystalline form into amorphous form, and most of the AO-60 molecules could be uniformly dispersed in the NBR matrix. The glass transition temperature (T g ) of NBR/AO-60 composites increased gradually with increasing content of AO-60. The increase in T g could be attributed to the formation of a strong hydrogen bonding network between the AO-60 molecules and the NBR matrix. Unlike the pure NBR, the NBR/AO-60 rubber composites had only one transition with a high loss factor. With increasing content of AO-60, the loss peak shifted to the high temperature region, the loss factor increased from 1.45 to 1.91, and the area under the tan d versus temperature curve (TA) also showed a significant increase. All these results were ascribed to the good compatibility and strong intermolecular interactions between NBR and AO-60. Furthermore, all NBR/AO-60 composites exhibited higher glass transition temperatures and tensile strength than NBR, and they had other desirable mechanical properties. They have excellent prospects in damping material applications.

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Effect of morphology, crosslink density, and miscibility on interpenetrating polymer network damping effectiveness

Cited by 89 publications

References 21 publications

A potential material for tissue engineering: Silkworm silk/PLA biocomposite

A potential material for tissue engineering: Silkworm silk/PLA biocomposite

Epoxy/castor oil graft interpenetrating polymer networks

Structure and dynamic properties of nitrile‐butadiene rubber/hindered phenol composites

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