Polychloroprene nanocomposites filled with different organically modified clays: Morphology, thermal degradation and stress relaxation behaviour

Mohomane, Samson Masulubanye; Djoković, Vladimir; Thomas, Sabu; Luyt, A. S.

doi:10.1016/j.polymertesting.2011.03.002

Cited by 22 publications

(14 citation statements)

References 20 publications

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“…Nanoclays are commonly used in SPU to gain excellent reinforcing properties due to matching dimension of the hard segment of SPU with that of nanoclay. Among many types of nanoclay, naturally occurring montmorillonite (MMT) has been reported widely, wherein it has been reported that an inclusion of 1-3 mass% of nanoclay in SPU generate an effective reinforcement, optimum level of thermal stability, and significant changes in mechanical and functional properties [1][2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Crystallization kinetics of polyurethane nanocomposites

Gupta

Abbas

Sharma

et al. 2014

J Therm Anal Calorim

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Nanocomposites of the segmented polyurethane (SPU) polymer containing different grades of Cloisite Ò nanoclay at 3 mass% loading have been prepared. The morphology of the prepared nanocomposites has been viewed through scanning electron microscope combined with energy dispersive X ray for the confirmation of the nanocomposite formation. Their non-isothermal crystallization kinetics have been investigated by applying modified Avrami and combined Avrami-Ozawa equations at four different cooling rates using a modulated differential scanning calorimeter. The crystallization parameters e.g., peak temperature (T p ), associated enthalpy (DH), etc., have been calculated. It has been observed that the addition of nanoclay into SPU accelerates the rate of nucleation and thereby, growth of crystallization in SPU. The Avrami exponent 'n' has shown two dimensional growth, while the rate constant 'Z c ' indicates an increase in the crystallization rate with increasing rate of cooling. The activation energy of the crystallization process has been calculated using Kissinger method. The glass transition temperature has also been estimated using thermomechanical analyzer, and the nanocomposites show superiority over the neat SPU.

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Section: Introductionmentioning

confidence: 99%

Crystallization kinetics of polyurethane nanocomposites

Gupta

Abbas

Sharma

et al. 2014

J Therm Anal Calorim

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“…Then, clay employed as a heterogeneous nucleation agent promoted to create more foaming nucleation centers in the polymer at a high curing temperature and pressure. 26 In Figure 2(b), the SA resulted in a certain degree of aggregation of OMMT; therefore, too many cells were generated around the OMMT, which was easy to lead the cell coalescence. Besides, lower pressure inside the large cells also promotes more gas diffusion towards the larger cells than towards the smaller cells.…”

Section: Resultsmentioning

confidence: 99%

“…First, foaming should result in many small cells and those cells should not grow and coalesce too fast at the beginning of curing. Then, clay employed as a heterogeneous nucleation agent promoted to create more foaming nucleation centers in the polymer at a high curing temperature and pressure 26. In Figure2(b), the SA resulted in a certain degree of aggregation of OMMT; therefore, too many cells were generated around the OMMT, which was easy to lead the cell coalescence.…”

mentioning

confidence: 99%

Effect of stearic acid/organic montmorillonite on EVA/SA/OMMT nanocomposite foams by melting blending

Zhang

Xue

et al. 2014

Journal of Cellular Plastics

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The effects of stearic acid (SA)/organic montmorillonite (OMMT) on the morphology and mechanical properties of nanocomposite foams based on ethylene vinyl acetate (EVA) copolymer were studied. The dispersion of montmorillonite layers was characterized by both X-ray diffraction and transmission electron microscopy. The cellular microstructure of the foamed samples was observed by scanning electron microscope. The effects of SA/OMMT on the mechanical properties of the EVA-based foams were also investigated. It was found that the combined effects of the existence of SA/OMMT led to bimodal foam structure in EVA/SA/OMMT nanocomposite foams. Compared with pure EVA foams, the density of EVA/SA/OMMT foams became lower with the addition of SA/OMMT, while the peel strength and elongation-at-break of the samples were increased.

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“…Furthermore, PA12, which has the smallest water absorption of among all PA groups analysed to date, is advantageous since water-dispersion lubricants are often used during the SPIF. In recent years Cloisite 93A filler has been used as a reinforcing agent in polymer matrices: polyamide 12 [43], polyamide 6 [50,51], polypropylene [52], poly(lactic acid) [53], epoxy [54,55], and polychloroprene [56].…”

Section: Introductionmentioning

confidence: 99%

Characterisation of Polyamide (PA)12 Nanocomposites with Montmorillonite (MMT) Filler Clay Used for the Incremental Forming of Sheets

et al. 2019

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In this paper, the preparation and characterisation of polymer materials suitable for single point incremental forming (SPIF) technology were performed. Three different kinds of mixtures were selected: a mixture of neat polyamide 12 (PA12), a nanocomposite with PA12 matrix and 1% clay (Cloisite 93A), and a nanocomposite with PA12 matrix and 3% clay (Cloisite 93A). Materials were produced using a melt intercalation method followed by compression moulding. According to the needs of SPIF technology, morphological and mechanical properties were investigated in the obtained mixtures. Transmission electron microscopy (TEM) and X-ray diffraction (XRD) were used to characterize morphological properties. It was determined that the most desired obtained exfoliated structure of clay in the polymer matrix was achieved. Static tensile testing and dynamic mechanical analysis as well as the determination of glass transition temperature and crystallinity of all analysed materials were used to obtain mechanical and thermal properties of the mixtures. The results obtained for each mixture were compared with respect to the content of clay. The content of clay (Cloisite 93A) showed a strong influence on the properties of the obtained materials. The presence of clay (Cloisite 93A) affected the increase of tensile strength and Young’s modulus, while its influence on the attained elongation was not unique.

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Polychloroprene nanocomposites filled with different organically modified clays: Morphology, thermal degradation and stress relaxation behaviour

Cited by 22 publications

References 20 publications

Crystallization kinetics of polyurethane nanocomposites

Crystallization kinetics of polyurethane nanocomposites

Effect of stearic acid/organic montmorillonite on EVA/SA/OMMT nanocomposite foams by melting blending

Characterisation of Polyamide (PA)12 Nanocomposites with Montmorillonite (MMT) Filler Clay Used for the Incremental Forming of Sheets

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