A Fourier-transform Raman study of the strain-induced crystallization and cold crystallization of natural rubber

Healey, Adam; Hendra, P.J.; West, Yvonne D.

doi:10.1016/0032-3861(96)00257-1

Cited by 40 publications

(26 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Curve fitting and fitted frequency values labeled * were performed as per Bresson et al [16]. We can note that the position of the peaks of NR matrix spectrum is similar to those described stufly by different authors [17][18][19]. On the IR spectrum (see Fig.…”

Section: Resultsmentioning

confidence: 81%

Study of nanocomposites based on cellulose nanoparticles and natural rubber latex by ATR/FTIR spectroscopy: The impact of reinforcement

Agrebi

Ghorbel

Bresson³

et al. 2018

Polymer Composites

View full text Add to dashboard Cite

In materials research, polymer nanocomposites have attracted great attention worldwide from both academic and industrial points of view. The material properties of polymers can be enhanced dramatically by incorporating nanoelements from renewable resources depending on their biological origin (e.g., cellulose, starch, and chitin). We have used as the reinforcing phase, in this work, cellulose nanowhiskers (CNWs) and nanofibrillated cellulose (NFC) to prepare nanocomposite films by casting/evaporation using natural rubber (NR) latex as the matrix. Our interest is focused, in this work, especially on the investigation of the chemical bonds of the NR matrix and the chemical links of nanowhiskers added to the matrix and therefore the physical and chemical interactions which could happen between the reinforcement and the matrix. Many techniques have been used to explore the interface. Among these techniques, attenuated total reflectance/Fourier transform infrared spectroscopy (ATR/FTIR), which is employed in this work. It is exhibited that some differences are observed in FTIR spectra of nanocomposite films when adding cellulose nanoparticles into NR matrix. Overall IR spectroscopy clearly demonstrated that the interfacial adhesion in the case of NR‐NFC nanocomposite is higher than that of NR‐CNW one which was explained by the presence of residual lignin at the NFC surface that play the role of “compatibilizing” agent that enhance the adhesion between the NFC and the NR. POLYM. COMPOS., 2018. © 2018 Society of Plastics Engineers

show abstract

Section: Resultsmentioning

confidence: 81%

Study of nanocomposites based on cellulose nanoparticles and natural rubber latex by ATR/FTIR spectroscopy: The impact of reinforcement

Agrebi

Ghorbel

Bresson³

et al. 2018

Polymer Composites

View full text Add to dashboard Cite

show abstract

“…17 Nevertheless, the present review will be limited to wide-angle x-ray diffraction (WAXD) studies of SIC, from the pioneering works to the most recent studies. The reader interested in theoretical and thermodynamical approaches is invited to consult the works of Flory, 18 Treloar, 19 or Roberts and Mandelkern.…”

Section: Introductionmentioning

confidence: 99%

Strain-Induced Crystallization of Natural Rubber: A Review of X-Ray Diffraction Investigations

Huneau

2011

Rubber Chemistry and Technology

213

149

View full text Add to dashboard Cite

Strain-induced crystallization of natural rubber was discovered in 1925 by the means of x-ray diffraction and has been widely investigated by this technique until today. The studies devoted to the structure of the crystalline phase of natural rubber are first reviewed. This structure is strongly anisotropic and can be related to the exceptionally good strength and fatigue properties of this material. The relationships between strain-induced crystallization of natural rubber and its mechanical response, during static or tension-retraction tests, are also reviewed and discussed; in particular, the hysteresis of the stress-strain curve is mainly explained by strain-induced crystallization. The kinetics of crystallization under both static and cyclic deformation is also discussed, as well as the influence of different factors, depending either on material composition (crosslink density, carbon black fillers) or on external parameters (temperature, strain rate. . . )

show abstract

“…Estes resultados estão de acordo com os encontrados na literatura [18][19][20][21][22][23] . Observa-se que as principais linhas da PANI-DBSA estão presentes no compósito comprovando a ocorrência da polimerização da PANI.…”

Section: Resultsunclassified

“…Estiramento da ligação C-N da amina secundária (18) 1297 1303 Estiramento C=C do anel quinóide (19) 1559 1565 Deformação angular do CH 2 (23) 1448 1450 Deformação angular simétrica do CH 3 (23) 1375 1375 Deformação axial simétrico da ligação C=C (23) 1662 1664 Deformação axial assimétrica da C-H no CH 3 (23) 2960 2962 Deformação axial simétrico da ligação =C-H (23) 3035 3035 Estiramento O -H (19) 3444 3446 3 00 4 00 500 600 700 8 00 9 00 1000…”

unclassified

Compósitos de borracha natural com polianilina

et al. 2007

View full text Add to dashboard Cite

Resumo: Compósitos de borracha natural (Hevea brasiliensis)-BN/polianilina -PANI, com diferentes composições foram obtidos através da polimerização por emulsão do monômero anilina na presença da BN e do ácido dodecilbenzeno sulfô-nico (DBSA). Filmes finos e homogêneos foram obtidos por prensagem a quente. Os compósitos foram caracterizados por condutividade elétrica, FTIR, UV-vis-NIR, DSC e difração de raios X. Compósito com condutividade elétrica cerca de 14 ordens de grandeza maior que a BN foi obtido. Este alto valor de condutividade é atribuído à formação da PANI no estado dopado no compósito, que foi verificado através das técnicas de UV-vis-NIR e FTIR. Os resultados obtidos com a técnica de DSC e difratometria de raios X indicaram que os polímeros são imiscíveis e que a presença da borracha não altera significantemente a fase cristalina da PANI-DBSA no compósito.Palavras-chave: Polimerização por emulsão, borracha natural, polianilina. Composites of Natural Rubber with PolyanilineAbstract: In this work composites with different compositions were obtained from natural rubber (Hevea brasiliensis) (NR) and polyaniline (PANI) using the emulsion polymerization of aniline in the presence of NR and dodecylbenzenesulfonic acid (DBSA). The samples in film form were obtained by pressing the precipitate at 100 °C for 5 minutes. The composites were characterized by electrical conductivity, Fourier-transform infrared spectroscopy (FTIR), UV-vis-NIR spectroscopy, differential scanning calorimetry (DSC) and X ray diffraction. Composites with electrical conductivity about 14 orders of magnitude higher than NR were obtained. The UV-vis-NIR and FTIR spectra showed that PANI-DBSA was formed in the composites, thus making it responsible for their high conductivity. The DSC thermograms indicated that the two polymers are immiscible and X ray diffraction evidenced that NB does not considerably affect PANI-DBSA crystalline phase in the composite.Keywords: Emulsion polymerization, natural rubber, polyaniline. IntroduçãoOs polímeros intrinsecamente condutores possuem grande potencial para aplicações tecnológicas, devido principalmente a suas propriedades elétricas e óticas. Dentre esses polímeros condutores, destaca-se a polianilina-PANI devido a sua estabilidade química no estado dopado em condições ambientais e também por ser facilmente sintetizada quimicamente [1] . Entretanto, uma das limitações no uso da polianilina tem sido sua processabilidade apresentando baixa solubilidade e infusibilidade. Dentro deste contexto, blendas e compósitos com polímeros convencionais têm atraído muita atenção, uma vez que estes possibilitam a combinação das excelentes propriedades mecânicas e a alta processabilidade, com a condutividade elétrica da polianilina, aumentando o potencial tecnológico destes materiais. A polimerização via emulsão da anilina na presença de um outro polímero em solução [2][3][4][5] , tem sido uma alternativa viável. A vantagem deste método é que ele fornece uma grande quantidade de material que pode ser processado po...

show abstract

A Fourier-transform Raman study of the strain-induced crystallization and cold crystallization of natural rubber

Cited by 40 publications

References 26 publications

Study of nanocomposites based on cellulose nanoparticles and natural rubber latex by ATR/FTIR spectroscopy: The impact of reinforcement

Study of nanocomposites based on cellulose nanoparticles and natural rubber latex by ATR/FTIR spectroscopy: The impact of reinforcement

Strain-Induced Crystallization of Natural Rubber: A Review of X-Ray Diffraction Investigations

Compósitos de borracha natural com polianilina

Contact Info

Product

Resources

About