The structural characteristics of orientated polyethylene micro-fibrils of various molecular weights

Marikhin, V. A.; Myasnikova, L. P.; Viktorova, N.L.

doi:10.1016/0032-3950(76)90347-6

Cited by 9 publications

(8 citation statements)

References 4 publications

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“…Furthermore, their fraction increases with the degree of elongation at a given temperature and with a decreasing stretching temperature. Results of these calculations agree well with the theoretical estimates [21] of the fraction of interfibrillar amorphous regions in oriented PE as well as with the direct X-ray structural measurements [27]. Thus the thermoelastic behaviour of oriented PE may be non-contradictorily accounted for in terms of the Peterlin-Prevorsek model.…”

Section: Q = 2rheas (1 -W) + ~Cr W]supporting

confidence: 71%

“…It is well known that the fibrillar structure of crystalline polymers is determined by molecular characteristics, the supermolecular structure and orientation conditions [14,19,21]. In particular, for PE the X-ray analysis showed that low-molecular specimens have almost no interfibrillar amorphous regions, whereas in high-molecular specimens the proportion of interlayers may be large [27]. Accord- Fig.…”

Section: Q = 2rheas (1 -W) + ~Cr W]mentioning

confidence: 95%

“…table 1) [6] and comparison of them with those determined from measured elasticity moduli [24] shows that in such polymers the (27) values of/~ may be much higher than 0.5, wherefore the proposed deformation mechanism is quite probable. The last one of the models discussed herein is presently the most elaborated and experimentally supported model of an oriented crystalline polymer (the Peterlin-Prevorsek model) [20,21,26].…”

Section: Q = 2rheas (1 -W) + ~Cr W]mentioning

confidence: 99%

“…The method involves adding the contributions of the thermal effects of the intra-and interfibrillar amorphous regions (eq. (27)), the most low-molecular and the most highly-molecular samples having been used as the "standard" ones. It was assumed, besides, that in passing from a low-molecular to high-molecular PE, the fraction and degree of orientation of intrafibrillar tie-chains varied little and the appearance of interfibrillar amorphous regions was the only major change.…”

Section: Q = 2rheas (1 -W) + ~Cr W]mentioning

confidence: 99%

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Thermophysical behaviour of solid polymers in simple elongation: A structural and molecular interpretation

Godosvsky

1982

Colloid & Polymer Sci

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Thermodynamic aspects of reversible simple extension of solid polymers have been considered in terms of the conventional equation of state and equations have been :obtained for the thermodynamic functions. It is shown that simple deformation of solids is accompanied by inversion of internal energy which is controlled by coefficient of thermal expansion. Work, heat and internal energy as functions of strain have been determined by deformation calorimetry for the typical glass-like and crystalline polymers and it has been found that in uniaxially oriented crystalline polymers at above Tg the internal energy undergoes inversion due to the negative coefficient of thermal expansion. It has been demonstrated that the thermoelastic behaviour of two-phase crystalline polymers is controlled by the volume (irrotational) elasticity of amorphous regions rather than by shape elasticity typical of rubber elasticity. From this position, a thermophysical analysis of the deformation of the basic models of oriented crystalline polymers and combined investigation of the thermal phenomena and structural changes in oriented PE and PP have been carried out. It has been shown that the Peterlin-Prevorsek model which implies existence of both intra-and interfibrillar amorphous regions quite adequately account for the thermophysical and structural effect observed in tension of the oriented specimens in the original and annealed state. Thermoelastic properties of super-oriented crystalline polymers have also been discussed in brieL

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Section: Q = 2rheas (1 -W) + ~Cr W]supporting

confidence: 71%

Section: Q = 2rheas (1 -W) + ~Cr W]mentioning

confidence: 95%

Section: Q = 2rheas (1 -W) + ~Cr W]mentioning

confidence: 99%

Section: Q = 2rheas (1 -W) + ~Cr W]mentioning

confidence: 99%

See 2 more Smart Citations

Thermophysical behaviour of solid polymers in simple elongation: A structural and molecular interpretation

Godosvsky

1982

Colloid & Polymer Sci

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“…Microand macrofibrillar slippage contributes primarily t o this process. T h e former is visualized by a change in the shape of the macrofibrils with drawing, distinctly seen in Figure 6 and shown schematically in Figure 8 (the microfibrillar slippage can also be deduced from the observed constancy of the X-ray long period and of the transverse sizes of microfibrils on drawing [10,11,87,88]. T h e latter can be inferred from a comparative analysis of the sample deformation and that of recrystallized spherulites.…”

Section: Micro-and Macrofibrillar Structure In Oriented Polymers and mentioning

confidence: 99%

Structural Basis of High‐Strength High‐Modulus Polymers

Marikhin¹,

Myasnikova²

1996

Oriented Polymer Materials

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Bioinspired Chitinous Material Solutions for Environmental Sustainability and Medicine

Fernandez

Ingber

2013

Adv Funct Materials

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Chitin—the second most abundant organic material on earth—is a polysaccharide that combines with proteinaceous materials to form composites that provide the structural backbone of insect cuticles, crustacean exoskeletons, cephalopod shells and covering surfaces of many other living organisms. Although chitin and its related chitosan materials have been used in various industrial and medical applications based on their chemical properties, their unique mechanical functions have not date been leveraged for commercial applications. The use of chitinous materials for structural applications has been limited by our inability to reproduce, or even fully understand, the complex hierarchical designs behind naturally occurring chitin composites. In this article, an example of engineered chitinous materials is used to introduce the reader to the potential value that bioinspired materials offer for engineering of synthetic and biological materials. The nature of chitin and its general characteristics are first reviewed, and examples of chitinous structures are presented that are designed to perform very different functions, such as nacre and the insect cuticle. Investigation of the structural organization of these materials leads to understanding of the principles of natural materials design that are beginning to be harnessed to fabricate biologically‐inspired composites for materials engineering with tunable properties that mimic living materials, which might provide useful for environmental challenges, as well as medical applications.

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The structural characteristics of orientated polyethylene micro-fibrils of various molecular weights

Cited by 9 publications

References 4 publications

Thermophysical behaviour of solid polymers in simple elongation: A structural and molecular interpretation

Thermophysical behaviour of solid polymers in simple elongation: A structural and molecular interpretation

Structural Basis of High‐Strength High‐Modulus Polymers

Bioinspired Chitinous Material Solutions for Environmental Sustainability and Medicine

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