Structure development of PMMA/SAN blends in shear flow

Keestra, BJ; Goossens, Jgp Han; Anderson, Patrick Patrick

doi:10.1016/j.ces.2011.04.014

Cited by 8 publications

(5 citation statements)

References 40 publications

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“…It is unequivocally established that poly(methyl methacrylate)/poly(styrene‐ co ‐acrylonitrile) (PMMA/SAN) blends are miscible, if the acrylonitrile (AN) content in the SAN is below 30% . Note that PMMA is neither miscible with polystyrene (PS) nor with polyacrylonitrile (PAN).…”

Section: Introductionmentioning

confidence: 99%

“…The miscibility of PMMA/SAN blends was studied in detail by using various experimental techniques such as optical and torsional pendulum measurements, cloud point measurements, small angle neutron scattering (SANS), differential scanning calorimetry (DSC), rheology, atomic force microscopy (AFM), positron life time measurements, and small angle light scattering (SALS) . Most of these studies support ‘copolymer repulsion mechanism’ as the driving force for miscibility, while a few researchers reported on the specific attractive interactions between carbonyl groups of PMMA and phenyl groups of SAN …”

Section: Introductionmentioning

confidence: 99%

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Miscibility, UV resistance, thermal degradation, and mechanical properties of PMMA/SAN blends and their composites with MWCNTs

Parameswaranpillai

Joseph

Jose

et al. 2016

J of Applied Polymer Sci

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Poly(methyl methacrylate)/poly(styrene-co-acrylonitrile) (PMMA/SAN) blends, with varying concentrations, were prepared by melt-mixing technique. The miscibility is ensured by fixing the acrylonitrile (AN) content of styrene acrylonitrile (SAN) as 25% by weight. The blends were transparent as well. The Fourier transform infrared spectroscopic (FTIR) studies did not reveal any specific interactions, supporting the well accepted 'copolymer repulsion effect' as the driving mechanism for miscibility. Addition of SAN increased the stability of PMMA towards ultraviolet (UV) radiations and thermal degradation. Incorporation of even 0.05% by weight of multi-walled carbon nanotubes (MWCNTs) significantly improved the UV absorbance and thermal stability. Moreover, the composites exhibited good strength and modulus. However, at higher concentrations of MWCNTs (0.5 and 1% by weight) the thermomechanical properties experienced deterioration, mainly due to the agglomeration of MWCNTs. It was observed that composites with 0.05% by weight of finely dispersed and well distributed MWCNTs provided excellent protection in most extreme climatic conditions. Thus, PMMA/SAN/MWCNTs composites can act as excellent light screens and may be useful, as cost-effective UV absorbers, in the outdoor applications.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Miscibility, UV resistance, thermal degradation, and mechanical properties of PMMA/SAN blends and their composites with MWCNTs

Parameswaranpillai

Joseph

Jose

et al. 2016

J of Applied Polymer Sci

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“…Usually, the shape, size and distribution of dispersion phase are related to the crystallization behavior, rheological behavior and mechanical properties of polymer materials. Since the shearing occurs during the processing of polymeric materials and has been proved to greatly affect the morphology [15,16] , microstructure [17,18] , thermal behavior [19,20] and rheological properties [21−23] of multicomponent polymers, it is necessary to investigate the influences of processing factors (such as shear rate, shear time etc.) on the morphology and other properties of IPC.…”

Section: Introductionmentioning

confidence: 99%

Influence of shearing on impact polypropylene copolymer: Phase morphology, thermal and rheological behavior

Liang

Chen

et al. 2012

Chin J Polym Sci

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The influences of shearing conducted by a Brabender rheometer on phase morphology, thermal and rheological behavior of a commercial impact polypropylene copolymer (IPC) were studied. The crystallization and melting traces show that short-time annealing at 210°C is unable to completely erase the influence of shearing on the samples. When the samples which were treated at a rotation speed of 80 r/min crystallize at a cooling rate of 10 K/min, their T c s and corresponding T m s obviously rise with the increase of shearing time. Furthermore, the POM results reveal that the shearing can lead to the formation of shish-kebab and the shish-kebab amount is proportional to shearing time. The rheological measurement results show that the treated samples exhibit different G′~ω dependences. The 'second plateau' appears when the sample is treated at a rotation speed of 60 r/min or 80 r/min for 10 min, and linear G′~ω dependence is observed at other rotation speeds. In addition, it is found that the appearance of the 'second plateau' depends on the shearing time when the rotation speed is fixed. According to SEM observations, it is proposed that the 'second plateau' of IPC samples should be ascribed to the aggregation of dispersion particles.

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“…PMMA (homopolymer) and SAN (copolymer) exhibit different critical temperatures with different blend compositions. PMMA/SAN blends that show spinodal decomposition (SD) have been extensively studied in recent years . Furthermore, by varying the acrylonitrile (AN) content of the SAN copolymer, the miscibility of SAN with PMMA can be systematically adjusted .…”

Section: Introductionmentioning

confidence: 99%

Enhancing electrical properties of MWCNTs in immiscible blends of poly(methyl methacrylate) and styrene‐acrylonitrile copolymer by selective localization

Sarvi

Sundararaj

2014

Polymer Composites

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Multiwalled carbon nanotubes (MWCNTs) were introduced into poly(methyl methacrylate) (PMMA) and styrene‐acrylonitrile copolymer (SAN) blends by melt mixing in an asymmetric miniature mixer (APAM). A composition of 70 wt% of PMMA and 30 wt% of SAN was mixed to create a co‐continuous morphology. Transmission electron microscopy images of ultra‐microtomed samples (70 nm in thickness) showed selective localization of MWCNTs inside the percolated SAN phase. The occurrence of the double percolation phenomenon resulted in lower electrical percolation thresholds of PMMA/SAN/MWCNT blends molded at high temperatures. Dielectric spectroscopy indicated a higher electrical permittivity for samples that were compression molded at 260°C. Due to the higher affinity of MWCNTs to SAN, there was a migration of MWCNTs into the SAN phase during the melt processing. Conductivity measurements revealed a significant decrease in electrical percolation threshold (0.4 wt%) for PMMA70/SAN30 blends compared with MWCNT‐filled SAN and MWCNT‐filled PMMA (ca. 0.8 wt%). POLYM. COMPOS., 37:1523–1530, 2016. © 2014 Society of Plastics Engineers

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Structure development of PMMA/SAN blends in shear flow

Cited by 8 publications

References 40 publications

Miscibility, UV resistance, thermal degradation, and mechanical properties of PMMA/SAN blends and their composites with MWCNTs

Miscibility, UV resistance, thermal degradation, and mechanical properties of PMMA/SAN blends and their composites with MWCNTs

Influence of shearing on impact polypropylene copolymer: Phase morphology, thermal and rheological behavior

Enhancing electrical properties of MWCNTs in immiscible blends of poly(methyl methacrylate) and styrene‐acrylonitrile copolymer by selective localization

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