Effect of Scale-Dependent Viscosity and Transesterification on Filling Behavior of Polycarbonate/Poly(ethylene terephthalate) Blends in Micro-Injection Molding

Cai, Bin; Jiang, Jing; Cao, Yongjun; Sun, Junwei; Zhang, Ning; Li, Qian

doi:10.1007/s13233-022-0023-y

Cited by 5 publications

(1 citation statement)

References 40 publications

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“…It is well known that iPP is a semicrystalline multiphase polymer and its microstructures such as the crystallinity, crystal size, and crystal form, directly affect the mechanical properties of products. 53 Considering that its injection molded products have a typical skin-core structure 54 and RHCM has a positive effect on the surface as mentioned, hardness is one of the most important mechanical properties affecting the application of iPP products. 55 As shown in Figure 9, comparing the changes of shore hardness (D scale) of CIM, RHCM60, and RHCM90 during photodegradation, it is found that the hardness of iPP samples increases with increasing mold temperature.…”

Section: Effect Of Rhcm On Photodegradationmentioning

confidence: 99%

Effect of microstructure tuning by rapid heat cycle molding on the photodegradation behavior of isotactic polypropylene

Li,

Chen,

Xie

et al. 2024

J of Applied Polymer Sci

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Rapid heat cycling molding (RHCM) is an injection molding technique that improves the product quality of isotactic polypropylene (iPP) by tuning the microstructure, but its effect on the photodegradation stability remains to be investigated. In this work, the effect of RHCM tuned microstructure on the photodegradation behavior of iPP was investigated and compared with conventional injection molding (CIM). Differential scanning calorimetry (DSC), x‐ray diffraction (XRD), Fourier transform infrared spectrometer (FTIR), atomic force microscopy (AFM), and shore durometer (D scale) were used to examine the photodegradation behavior of iPP samples. The results showed that RHCM increased the crystallinity, crystal size, and β‐crystal content of iPP samples. With the increase of photodegradation time, iPP samples injected with RHCM showed higher stability in terms of microstructure and surface quality. The relative changes in CI and Ra of RHCM90 were reduced by 48% and 40% after 800 h of UV irradiation, respectively. In addition, the combined results of dynamic mechanical analysis (DMA) and UV–visible absorption spectrum showed that RHCM promoted the development of crystalline structure and reduced the mobility of the surface chain segments as well as UV absorption coefficient. These combined effects contributed positively to its photodegradation stability.

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Section: Effect Of Rhcm On Photodegradationmentioning

confidence: 99%

Effect of microstructure tuning by rapid heat cycle molding on the photodegradation behavior of isotactic polypropylene

Li,

Chen,

Xie

et al. 2024

J of Applied Polymer Sci

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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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Evaluation of shear yield stress and apparent viscosity of xanthan gum solutions: application of rheological models and analytical study

Chalah,

Hammiche,

Bennnoui

et al. 2024

Macromol. Res.

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Effect of Scale-Dependent Viscosity and Transesterification on Filling Behavior of Polycarbonate/Poly(ethylene terephthalate) Blends in Micro-Injection Molding

Cited by 5 publications

References 40 publications

Effect of microstructure tuning by rapid heat cycle molding on the photodegradation behavior of isotactic polypropylene

Effect of microstructure tuning by rapid heat cycle molding on the photodegradation behavior of isotactic polypropylene

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

Evaluation of shear yield stress and apparent viscosity of xanthan gum solutions: application of rheological models and analytical study

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