Solid-state Drawing of Polyethylenes: The Pseudo-affine Deformation Scheme and Aggregate Models Revisited

Dirix, Yvo; Tervoort, Theo A.; Bastiaansen, Cees W. M.; Lemstra, Piet J.

doi:10.1080/00405009508631336

Cited by 11 publications

(28 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…2 Thus oriented LLBBS-0.2 and LLBBS-0.5 films fit very well the theoretical prediction according to the values of PE and T sp reported for a perfect linear polarizer, i.e., 1 and 0.5, respectively, 1,3 whereas LLBTBBT-oriented films do not fit the scheme at all.…”

Section: Resultssupporting

confidence: 68%

Dichroic Properties of Bis(benzoxazolyl)stilbene and Bis(benzoxazolyl)thiophene Dispersed into Oriented Polyethylene Films: A Combined Experimental and Density Functional Theory Approach

et al. 2006

View full text Add to dashboard Cite

In this work, a combination of experimental and quantum mechanical investigations is performed for the study of dichroic absorption properties of melt-processed linear low-density polyethylene (LLDPE) oriented films containing < or =0.5 wt % of either 4,4'-bis(2-benzoxazolyl)stilbene (BBS) or 2,5-bis(5-tert-butyl-2-benzoxazolyl)thiophene (BTBBT). The data acquired reveal that the film optical anisotropy and the performances as linear polarizer are strongly dependent on the molecular structure of the chromophore. In particular, the rodlike structure of BBS favors the alignment of the dye along the drawing direction of the PE film, providing dichroic ratios as high as 100 and optical performances as linear polarizer close to the pseudo-affine deformation scheme. On the contrary BTBBT, although characterized by huge anisotropic potentialities, confers the oriented film very poor dichroism and is unsuitable for linear polarizer applications. This behavior is attributed to the more complex banana-shaped structure of BTBBT dye caused by the thiophene 2,5-functionalization that limits the molecule parallel orientation to the drawing direction.

show abstract

Section: Resultssupporting

confidence: 68%

Dichroic Properties of Bis(benzoxazolyl)stilbene and Bis(benzoxazolyl)thiophene Dispersed into Oriented Polyethylene Films: A Combined Experimental and Density Functional Theory Approach

et al. 2006

View full text Add to dashboard Cite

show abstract

“…The orientation behaviour of both components of the tensile deformed films can be qualitatively described by the theoretical pseudo-affine deformation scheme based on the aggregate model originally proposed by Ward [11][12][13] assuming that the dichroic guest molecules adopt the orientation of the polymeric matrix in which they are dispersed.…”

Section: Film Preparation and Characterizationmentioning

confidence: 99%

“…13 C NMR (CDCl 3 ): δ = 14.1 (CH 3 ); 22.7-29.7 (CH 2 ); 31.9 (-CH2-CH2-S); 36.9 (-CH2-CH2-S);123.6 (terthiophene C5"); 123.7-127.8 (terthiophene C); 133.9 (terthiophene C5) ppm.…”

Section: -(2-bromoethyl)undecanementioning

confidence: 99%

Effect of the dispersion of the chromophore on the optical performances of polarizers from polyethylene and 5”-thio- (3-butyl)nonyl-2,2’:5’,2”-terthiophene

et al. 2002

View full text Add to dashboard Cite

Abstract:A new polyethylene-compatible terthiophene chromophore, 5"-thio-(3-butyl)nonyl-2,2':5',2"-terthiophene, with melting point lower than 0°C was prepared and used for linear polarizers based on ultra-high-molecular-weight polyethylene (UHMWPE). Differential scanning calorimetry and scanning electron microscopy indicate that the new chromophore is dispersed uniformly in films of UHMWPE obtained by casting from solution. The films show excellent dichroic properties (dichroic ratio 30) at rather low drawing ratio (≈ 20) . Moreover, qualitative agreement is observed with the Ward pseudo-affine deformation scheme.

show abstract

“…Equation (5) represents   2 P , as a function of draw ratio only, for the case of the pseudoaffine model and has been presented in previous literature on this topic, see for example Dirix et al [6].…”

Section: The Pseudo-affine Modelmentioning

confidence: 99%

“…The first work to show this correlation in low density polyethylene between the pseudo-affine model and birefringence (technique employed to quantify the average orientation) was that of Crawford and Kolsky [2]. More recently Dirix et al [6] demonstrated the validity of this correlation for a wide range of polyethylenes: LDPE, LLDPE, HDPE and UHMW-PE. Surprisingly, no model has been developed to describe the evolution of the orientation of the crystalline phase with strain in semicrystalline polymers, in spite of the fact that there is strong experimental evidence in favour of crystalline orientation being a single function of strain and independent of the characteristics of the polymer considered.…”

Section: Introductionmentioning

confidence: 99%

The degree of crystalline orientation as a function of draw ratio in semicrystalline polymers: a new model based on the geometry of the crystalline chain slip mechanism

et al. 2015

View full text Add to dashboard Cite

The orientation behaviour of a range of high density polyethylenes (PEs) drawn to different draw ratios has been investigated by measurements of optical birefringence and wide angle Xray diffraction (WAXS). Consistent with previous research, it can be concluded that birefringence relates to the overall degree of orientation of the amorphous and crystalline phases, and is described to a good approximation by the pseudo-affine deformation scheme.The WAXS results show that crystalline orientation is also related uniquely to the applied strain and moreover is independent of the characteristics of the polymer concerned. It is shown that the crystalline orientation follows a new model based on the geometry of the crystalline slip mechanism where the crystalline phase deforms affinely in the longitudinal drawing direction.

show abstract

Solid-state Drawing of Polyethylenes: The Pseudo-affine Deformation Scheme and Aggregate Models Revisited

Cited by 11 publications

References 21 publications

Dichroic Properties of Bis(benzoxazolyl)stilbene and Bis(benzoxazolyl)thiophene Dispersed into Oriented Polyethylene Films: A Combined Experimental and Density Functional Theory Approach

Dichroic Properties of Bis(benzoxazolyl)stilbene and Bis(benzoxazolyl)thiophene Dispersed into Oriented Polyethylene Films: A Combined Experimental and Density Functional Theory Approach

Effect of the dispersion of the chromophore on the optical performances of polarizers from polyethylene and 5”-thio- (3-butyl)nonyl-2,2’:5’,2”-terthiophene

The degree of crystalline orientation as a function of draw ratio in semicrystalline polymers: a new model based on the geometry of the crystalline chain slip mechanism

Contact Info

Product

Resources

About