Optimizing of vented injection molding on mechanical performance and miscibility of recycled poly(ethylene terephthalate) and polycarbonate blends

Negoro, Takanori; Wongpajan, Rutchaneekorn; Thodsaratpreeyakul, Wiranphat; Boonlertsamut, Jitlada; Thumsorn, Supaphorn; Inoya, Hiroyuki; Hamada, Hiroyuki

doi:10.1515/polyeng-2016-0034

Cited by 6 publications

(2 citation statements)

References 21 publications

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“…Blending of PC with PET affected crystallinity of PET . Moreover, in the process of reaction, formation of its copolymers altered PET crystalline behavior.…”

Section: Resultsmentioning

confidence: 99%

Effects of mixing strategy on catalyst‐assisted reactive blending of polycarbonate and polyethylene terephthalate

Habibelahi

Ehsani

Morshedian

2018

Vinyl Additive Technology

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Reactive melt mixing of polycarbonate (PC) and polyethylene terephthalate (PET) blends with constant composition of 80:20 in the presence of a freshly added catalyst was conducted through a two-step method. At first, PC and PET underwent premixing and melt mixed in the absence of a fresh catalyst. Then, mixing continued with catalyst addition under the same previous condition. The effects of varied premixing times from 1 to 5 min and mixing intensity at rotor speeds of 30 and 50 rev/min (rpm) were separately evaluated in transesterification reaction. The results of solubility analysis showed that the longer premixing time and the higher mixing rate enhanced the rate and extension of reaction. Fourier transform infrared (FTIR) spectroscopy and thermal analysis by differential scanning calorimetry were conducted on specimens on the basis of solubility separations. The height ratio of carbonyl group peaks of PC and PET phases were calculated for their corresponding FTIR spectra. The height ratio for PET showed a good correlation with solubility data. Moreover, crystallinity of PET phase was influenced by the reaction which was analyzed by solubility parameters.

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“…Blending of PC with PET affected crystallinity of PET . Moreover, in the process of reaction, formation of its copolymers altered PET crystalline behavior.…”

Section: Resultsmentioning

confidence: 99%

Effects of mixing strategy on catalyst‐assisted reactive blending of polycarbonate and polyethylene terephthalate

Habibelahi

Ehsani

Morshedian

2018

Vinyl Additive Technology

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“…In a previous study [17], RPET/PC blends produced by using the vented barrel injection molding revealed the presence of partial immiscibility, which enhances the mechanical properties. Interestingly, the vented barrel injection molding has shown to be effective in producing RPET/PC blends, therefore, the effects of the vented barrel injection molding should be further studied.…”

Section: Introductionmentioning

confidence: 88%

Properties of Recycled-Polyethylene Terephthalate/Polycarbonate Blend Fabricated by Vented Barrel Injection Molding

Thodsaratpreeyakul¹,

Uawongsuwan²,

Negoro³

2018

MSA

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In this research, recycled-polyethylene terephthalate (PET) and polycarbonate (RPET/PC) blends fabricated by vented barrel injection molding were presented to better understand the effect of devolatilization during molding process. The effect of dried pellets, non-dried pellets, using an opened-vented hole, and using a closed-vented hole on the miscibility, morphology, thermal properties and mechanical properties of RPET/PC blends was investigated. The results indicated that no drying decreases dispersion, thermal properties, and mechanical properties of RPET/PC blends due to hydrolysis degradation of recycled-PET during the injection molding process. Using the venting system with non-dried RPET/PC blends partially improves dispersion, thermal properties and molecular weight of RPET/PC blends processed without drying, giving results that are similar to those processed with drying. Regarding the flexural properties, using the venting system without drying prevents the flexural properties from decreasing in RPET/PC blends, if the amount of RPET is less than 75 wt%. When the content of RPET is over 75 wt%, using the venting system does not eliminate the decrease in flexural properties of RPET/PC blends. When the venting system is applied to non-dried RPET, despite hydrolysis degradation of RPET not being completely eliminated, the damaging effects are nonetheless reduced compared with those samples processed without the venting system. As a result, vented barrel injection molding hardly prevents non-dried RPET/PC blends from having reduced flexural properties when the content of RPET is greater than 75 wt%.

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New insights into transreaction mechanism between poly (ethylene terephthalate) and bisphenol A polycarbonate in melt

Mikhaylov,

Filatova,

Kulichikhin

2024

Polymer International

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In the present study, the macromolecular chain composition of copolymers prepared by the reactive blending of poly(ethylene terephthalate) (PET) and bisphenol A polycarbonate (PC) in the presence of Ti(OBu)4 catalyst was tested using 1H and 13C NMR spectroscopy. The NMR spectra were meticulously analyzed across all regions, revealing unexpected results that provide new insights into the transreaction mechanism occurring between these two polymers in the melt phase. It was found that only two primary reactions occurred: the formation of a bisphenol A terephthalate bond accompanied by the release of ethylene carbonate and the formation of an aliphatic–aromatic ether bond with the release of CO2. The release of ethylene carbonate during the PET‐PC blending led to a loss of ethylene glycol (EG). The kinetics of EG loss and ether bond formation were examined. A new transreaction mechanism for PET‐PC reactive blending is proposed. © 2024 Society of Chemical Industry.

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Optimizing of vented injection molding on mechanical performance and miscibility of recycled poly(ethylene terephthalate) and polycarbonate blends

Cited by 6 publications

References 21 publications

Effects of mixing strategy on catalyst‐assisted reactive blending of polycarbonate and polyethylene terephthalate

Effects of mixing strategy on catalyst‐assisted reactive blending of polycarbonate and polyethylene terephthalate

Properties of Recycled-Polyethylene Terephthalate/Polycarbonate Blend Fabricated by Vented Barrel Injection Molding

New insights into transreaction mechanism between poly (ethylene terephthalate) and bisphenol A polycarbonate in melt

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