Effects of coupling agents on the mechanical and rheologica properties and mica‐reinforced polypropylene

Boaira, M. S.; Chaffey, Charles E.

doi:10.1002/pen.760171003

Cited by 98 publications

(32 citation statements)

References 5 publications

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“…Thus, particle orientation predominates at low F values (up to 8.5%), whereas a particle network assumes dominance at higher particle concentrations. 9 With surface treatment of CaSiO 3 , the app versus ␥ W plot exhibited a similar pattern to that of the i-PP/ CaSiO 3 system. However, the app data were lower than those for the corresponding untreated filler contents ( Figure 5).…”

Section: Apparent Melt Viscosity ( App )supporting

confidence: 59%

Rheological properties of calcium silicate‐filled isotactic polypropylene

Maiti

Singh

Ibrahim

2002

J of Applied Polymer Sci

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ABSTRACT:The melt rheological behavior of calcium silicate-filled isotactic polypropylene, with filler volume contents of 0 -17.8%, was determined at 493 K. The composites followed the power law in shear stress versus shear rate variations and were shear thinning. Initially, apparent melt viscosity decreased until a critical filler volume content of 8.5% was reached. However, on further increase in calcium silicate concentration, apparent melt viscosity increased. Melt elasticity also showed an initial decrease until 8.5% filler content was reached and then an increase beyond this filler content. Surface treatment of calcium silicate with a titanate coupling agent, LICA 38, modified the rheological properties because of the plasticizing/lubricating effect of LICA 38.

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Section: Apparent Melt Viscosity ( App )supporting

confidence: 59%

Rheological properties of calcium silicate‐filled isotactic polypropylene

Maiti

Singh

Ibrahim

2002

J of Applied Polymer Sci

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“…For mica-filled PP [31] and various thermoplastics filled with calcium carbonate [202,261] it was shown that the relative viscosity of filled systems was lower than that of systems which contained equivalent quantitied of unfinished filler. Note that in contrast to viscosity in shear, the viscosity in stretching is higher for systems with treated filler [202].…”

Section: Effect Of Adhesion On Pcm Properties Property Control By Momentioning

confidence: 97%

“…At the same time, the strength of the composite, especially the impact strength, is lower in materials with agglomerates than in materials with a more uniformly distributed filler [30]. Treatment of fillers with modifying agents may also result in a situation where the system featuring a higher viscosity will have poorer strength characteristics [31,32].The shear viscosity, especially as measured with capillary rheometers characterized by high shear rates, is hardly sensitive to material structure since the investigator usually has to deal with the substantially destroyed structure in the molten sample. Melt stretching experiments would normally provide much more information [33].…”

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confidence: 99%

Filled polymers: Mechanical properties and processability

Enikolopyan

Fridman

Stal'nova

et al. 1990

Filled Polymers I Science and Technology

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In this review the wide spectrum of properties of filled polymer systems is generalized. Classical and modern conceptions dealing with the influence of the boundary layer and filler on melting and crystallization of the polymer matrix. Polymer properties in the melted and condensed state are considered, attention being given to the influence of the filler particle size and shape, the nature of its surface, its structure, and agglomeration on the theological and mechanical characteristics of composites.Data on structure and properties of filled thermoplastic composites are summarized for the first time. Special attention is paid to the peculiarities of composites with modified polymerized filler behavior during rheological and mechanical testing and processing of such composites. IntroductionPolymeric composite materials (PCM) belong to one of the most important classes of structural materials attracting ever growing interest, as manifested by the huge flow of published scientific and technical information dealing with the problems of developing, preparing, processing and using PCM [1]. Whereas the oil and gas fuel crisis has receded recently, the problem of their restrained use still remains an urgent one if only because the oil and gas reserves are not unlimited and practically non-reproducible. Estimates by specialists have shown [2,3] that the development of PCM with a view to cut the consumption of polymeric materials can only be economically feasible if not less than 15% by volume of the filler are added.Waste products from a number of commercial processes can be used as cheap and readily available fillers for PCM. For example, lightweight structural materials may be obtained by filling various low-viscous resins with waste materials [4,5]. Also by adding fillers to reprocessed polymers it is possible to improve their properties considerably and thus return them to service [6]. This method of waste utilization is not only economically feasible but also serves an ecological purpose, since it will help to protect the environment from contamination. The maximum percentage of the filler should in these cases be such as to assure reliable service of the article made from the PCM under specified conditions for a specified period of time.However, the chief purpose of introduction of fillers into PCM is to make possible the modification of polymers and thereby create materials with a prescribed set of physico-mechanical properties, and, obviously, the properties of filled materials may be controlled by, for example, varying the type of the base polymer (the "matrix") and filler, its particle size distribution and shape. It may not require a large quantity of filler [7]. Thanks to considerable advances in PCM research, their use in a broad range of industries -machine building, construction, aerospace technology, etc. -has become extensive [8][9][10][11].Development of an assortment of polymeric composite materials, decSsions concerning their possible scope of applicability and service conditions involve research in...

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“…Dicumyl peroxide (DCP) was plasma, 7-9 titania coupling agent, 10 chlorinated obtained in commercial grade. The silane coupling paraffin, 11 silane coupling agent treatments, [12][13][14] agent, A-174, g-methacryloxy propyl trimethoxy and ultrasonic delamination. 15 In the area of rubsilane was supplied by Union Carbide (UK).…”

Section: Introductionmentioning

confidence: 99%

Swelling and static-dynamic mechanical behavior of mica-reinforced linear and star-branched polybutadiene composites

Nugay

Küsefoǧlu

Erman

1997

J. Appl. Polym. Sci.

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Physical properties of mica-reinforced linear (LPB) and star-branched polybutadiene (SPB) composites have been studied with special reference to the effect of silane coupling agent, degree of crosslinking, and degree of mica loading, as well as the molecular architecture of polybutadienes. Tensile properties increase and swelling decreases with addition of mica for linear polybutadiene. Star-branched polybutadiene shows a reverse behavior, especially beyond 5% of mica. The improvements in mechanical properties are more pronounced in the case of silane-treated mica compositions of both type of polybutadienes. Dynamic mechanical spectra were obtained for linear and star-branched polybutadienes. Effects of mica loading and silane treatment on dynamic moduli are discussed. Dynamic mechanical moduli ( E, EЉ) of composites increase with increasing mica content for linear polybutadiene but decrease for star-branched polybutadiene beyond certain mica loadings. Effective damping regions were determined in terms of frequency and temperature. The glass transition temperature (T g ) increased slightly, and the damping peak (tan d) broadened due to the rubber-filler interaction, especially after silane treatment for both polymers.

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Effects of coupling agents on the mechanical and rheologica properties and mica‐reinforced polypropylene

Cited by 98 publications

References 5 publications

Rheological properties of calcium silicate‐filled isotactic polypropylene

Rheological properties of calcium silicate‐filled isotactic polypropylene

Filled polymers: Mechanical properties and processability

Swelling and static-dynamic mechanical behavior of mica-reinforced linear and star-branched polybutadiene composites

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