Determination of atomic stress distribution in stressed polymers by infrared spectroscopy

Vettegren, V. I.; Novak, I. I.

doi:10.1002/pol.1973.180111105

Cited by 49 publications

(13 citation statements)

References 10 publications

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“…As a result, the stress distribution over individual chains is highly nonuniform, and it includes a great part of the overloaded SCS on which the actual stress is close to the ultimate strength of chemical bonds. [1,2] The breaking of the overloaded SCS in the l ¼ 7 sample results in the irreversible formation of the ''short'' debris seen in Fig. 2 in the range 10-20 nm.…”

Section: Resultsmentioning

confidence: 98%

“…It is well established in infrared [1,2] and Raman [3,4] spectroscopic studies that a tensile stress applied to an oriented semicrystalline polymer is distributed over individual chains in a quite nonuniform manner. However, under conditions of constantstrain relaxation, a fraction of highly strained chemical bonds (i.e., those that are strained many times more than the mean molecular deformation in the sample) is not stable and decays during $10 3 sec.…”

Section: Introductionmentioning

confidence: 99%

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Chain Straightening During Constant-Strain Relaxation in Melt-Crystallized Polyethylene Films

Kober

Егоров

Zhizhenkov

et al. 2003

Journal of Macromolecular Science, Part B

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The low-frequency Raman study of the chain-straightening process during stress relaxation in melt-crystallized polyethylene with molecular weight 10 5 is presented. The application of tensile stress to low-and mid-drawn films causes the formation of ''short'' (as compared with crystal cores) straight-chain-segments (SCS). During the subsequent stress relaxation, while keeping the strain constant, the amount of SCS in the l ¼ 7 sample (l is the draw ratio) gradually increases, while in the l ¼ 22 sample, a fraction of ''short'' SCS diminishes to zero within 3 days. This difference in the behavior of the low-and mid-drawn samples was ascribed to the difference in the contribution of the chain-breaking process. In the ultimately drawn sample (l ¼ 31), the length of the newly formed SCS is close to the crystal size, and they are situated, mainly, in the axially ordered interfibrillar phase. The formation of taut-tie molecules was not observed.

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Section: Resultsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Chain Straightening During Constant-Strain Relaxation in Melt-Crystallized Polyethylene Films

Kober

Егоров

Zhizhenkov

et al. 2003

Journal of Macromolecular Science, Part B

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“…3, несимметрична: на ее длинноволновом крыле наблюдается слабо выраженный дополнительный максимум около ~ 908 см -1 . Несимметричная форма суммарной полосы обусловлена тем, что в пленке существуют деформированные (растянутые) на различную ве-личину участки полимерных молекул [6][7][8][9][10][11][12][13][14][15][16][17][18]. По этой причине частоты их колебаний смещены в сторону низких частот на различную вели-чину (см.…”

Section: 3)unclassified

“…Предполагается, что при критической кон-центрации наполнителя его частицы соединяются в непрерывную це-почку, по которой тепло перетекает от одной поверхности тела к про-тивоположной. Такие представления хорошо описывают эксперимен-тальные данные, когда температуропроводность наполнителя в ≈ 10 [8][9][10] раз больше, чем матрицы. Однако температуропроводность матрицы и наполнителей, как правило, отличаются не более чем в 10 3 раз.…”

Section: температуропроводность композитовunclassified

Долговечность Полимерных Композитов

Башкарев¹,

Веттегрень²,

Суслов³

2016

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“…As mentioned above, the frequency shift Av is directly proportional to the stress on a segment Av = 0~c5 (1) where 0t is a constant coefficient, the magnitude of which is determined by the form of vibrations and structure of the segment. The procedure for the estimation of distribution is described in [9]. The procedure for the estimation of distribution is described in [9].…”

Section: Estimation O F Stress Distribution Over Interatomic Bondsmentioning

confidence: 99%

Overstressed interatomic bonds in stressed polymers

1975

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A B S T R A C T Infrared (IR) spectroscopy is used to find how the applied mechanical stress imposed upon a sample is distributed among the interatomic bonds. The distribution is highly heterogeneous: 80--95% of the bond population experience stresses close to the applied stress, the stress on the rest of the bond population varies over a wide range and reaches 1000--2000 kg/mm 2. The overstressed interatomic bonds lie in the amorphous regions of the polymer and are oriented in the direction of the mechanical force. The maximum stress on interatomic bonds is determined by the magnitude of the breaking stress on them. The breaking stress is shown to be a function of the applied stress, time, and temperature. This dependence is due to scission of stressed bonds induced by thermal fluctuations.Int. Journ. of Fracture, 11 (1975) 789-801

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Determination of atomic stress distribution in stressed polymers by infrared spectroscopy

Abstract: An attempt was made to evaluate stresses on chemical bonds in axially stressed polymers from the shift of skeletal vibration frequencies in chain molecules. The maximum stress on chemical bonds was found to be at least ten times the average stress on the specimen.

Cited by 49 publications

References 10 publications

Chain Straightening During Constant-Strain Relaxation in Melt-Crystallized Polyethylene Films

Chain Straightening During Constant-Strain Relaxation in Melt-Crystallized Polyethylene Films

Долговечность Полимерных Композитов

Overstressed interatomic bonds in stressed polymers

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