Segregation Behavior of Miscible PC/PMMA Blends during Injection Molding

Moonprasith, Nantina; Date, Jitsuhiro; Sako, Takumi; Kida, Takumitsu; Hiraoka, Tatsuhiro; Yamaguchi, Masayuki

doi:10.3390/ma15092994

Cited by 6 publications

(8 citation statements)

References 49 publications

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“…Based on our previous studies, [14][15][16] the blends containing 10 wt% PMMA-13k or PMMA-7k must be miscible at temperatures below 270 C. However, the miscibility of each blend was assessed by evaluating its light transmittance, dynamic mechanical properties in the solid state, and oscillatory shear modulus in the molten state.…”

Section: Miscibility Of the Blendsmentioning

confidence: 99%

“…The surface segregation phenomena should be noted because it will be widely detected during various processing operations in industry. Considering that a high shear rate accelerates surface segregation, this phenomenon is particularly relevant to material design with regard to injection molding 14,15 Recently, several manipulated material designs have been proposed for injection molding. [47][48][49][50] The phenomenon will also be relevant to novel methods of conferring functionality on injection-molded products.…”

Section: Surface Segregationmentioning

confidence: 99%

“…Shear-induced segregation has been reported for binary blends composed of bisphenol-A polycarbonate (PC) and poly(methyl methacrylate) (PMMA). 14,15 Yamaguchi et al studied the miscibility of the blend system. 16 The PC and PMMA samples were employed also in the present study.…”

Section: Introductionmentioning

confidence: 99%

“…Moonprasith et al 15 employed two types of blends to evaluate the segregation behavior; one was composed of high‐molecular‐weight PC (PC‐H) and low‐molecular‐weight PMMA (PMMA‐L, M w = 15,000), and the other was composed of high‐molecular‐weight PMMA (PMMA‐H) and low‐molecular‐weight PC (PC‐L, M w = 8700). In both blends, the weight fraction of a low‐molecular‐weight component was 10 wt%.…”

Section: Introductionmentioning

confidence: 99%

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Preparation of graded materials for miscible polycarbonate/poly(methyl methacrylate) blends by segregation under shear flow

Moonprasith

Tatsumichi

Nakamura

et al. 2022

J of Applied Polymer Sci

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Exposure to shear flow produced by a pressure‐driven capillary rheometer provides a concentration gradient without phase separation in miscible polymer blends of bisphenol‐A polycarbonate containing low‐molecular‐weight poly(methyl methacrylate) (PMMA). The strand surface extruded from the rheometer contains a large amount of PMMA. However, the strand is transparent because there is no light scattering due to phase separation. The segregation behavior, that is, enrichment of the PMMA content at the strand surface, is enhanced when the molecular weight of PMMA is low. Furthermore, the segregation is also enhanced at high temperatures and at high shear rates. By contrast, the die length barely affects the degree of segregation. The segregation phenomenon should be noted because it may facilitate the modification of the surface properties of various products.

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Section: Miscibility Of the Blendsmentioning

confidence: 99%

Section: Surface Segregationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Preparation of graded materials for miscible polycarbonate/poly(methyl methacrylate) blends by segregation under shear flow

Moonprasith

Tatsumichi

Nakamura

et al. 2022

J of Applied Polymer Sci

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“…These polymer blends always lose their transparency because of phase separation. It is known that poly(methyl methacrylate) (PMMA) with a low molecular weight can be miscible with PC and provides good flowability with enhanced scratch resistance [ 13 , 14 , 15 , 16 ], although the blends show phase separation at high temperatures, i.e., beyond lower critical solution temperatures (LCSTs) and under high pressure [ 17 ]. Once phase separation occurs, the blends become opaque due to the huge difference in the refractive index.…”

Section: Introductionmentioning

confidence: 99%

Novel Transparent Films Composed of Bisphenol-A Polycarbonate and Copolyester

2022

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In this paper, the structure and properties of transparent films composed of bisphenol-A polycarbonate (PC) and a commercially available copolyester, poly(1,4-cyclohexanedimethanol-co-2,2,4,4-tetramethyl-1,3-cyclobutanediol-co-terephthalate) (CPE), were studied. Both PC and CPE films are known to be transparent with good mechanical toughness. It was found that PC/CPE (50/50) showed miscibility in both the molten and solid states, indicating that there is a high possibility for the blend system to be miscible in the whole blend ratios. Because of the miscibility, the blend films showed no light scattering originating from phase separation. The mechanical properties of the films, such as Young’s modulus, yield stress, and strain at break, were determined by the blend ratio, and the glass transition temperature increased with the PC content, which corresponded well with the values predicted by the Fox equation. These results demonstrate that the thermal and mechanical properties of the films can only be controlled by the blend ratio. Since these transparent films showed excellent mechanical toughness irrespective of the blend ratios, they can be employed in various applications.

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Recyclability Studies on Poly(lactic acid)/Poly(butylene succinate‐co‐adipate) (PLA/PBSA) Biobased and Biodegradable Films

Coltelli,

Aliotta,

Fasano

et al. 2023

Macro Materials & Eng

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Poly(lactic acid)/poly(butylene succinate‐co‐adipate) (PLA/PBSA) blends are found promising for film packaging applications because of their flexibility, resistance, and compostability. Industrially extruded granules and films based on PLA and containing different amounts of PBSA are reprocessed through mini‐extrusion, to simulate recycling, and tested in terms of their melt flow rate as a function of PBSA content. Moreover, pure PLA commercial granules and the film produced extruding the PLA/PBSA 60/40 blend are reprocessed several times by injection molding and characterized in terms of melt flow rate, mechanical properties, thermal properties, and color as a function of injection molding cycles. The variation in melt fluidity and thermo‐mechanical properties is negligible up to 3 injection molding cycles for both pure PLA granules and PLA/PBSA blend. In the case of blend the change in color (yellowing and darkening) is more evident and slight local compositional change in injection molded items can be evidenced as well as a slight decrease in PBS crystallinity as a function of injection molding cycles. Nevertheless, in applications where these aspects are not critical, these materials can be recycled by extrusion or injection molding before being composted, thus prolonging their life cycle and storing carbon in them as longer as possible.

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Segregation Behavior of Miscible PC/PMMA Blends during Injection Molding

Cited by 6 publications

References 49 publications

Preparation of graded materials for miscible polycarbonate/poly(methyl methacrylate) blends by segregation under shear flow

Preparation of graded materials for miscible polycarbonate/poly(methyl methacrylate) blends by segregation under shear flow

Novel Transparent Films Composed of Bisphenol-A Polycarbonate and Copolyester

Recyclability Studies on Poly(lactic acid)/Poly(butylene succinate‐co‐adipate) (PLA/PBSA) Biobased and Biodegradable Films

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