Macromol. React. Eng. 2/2008

Sumino, Ken-ichi; Taniike, Toshiaki; Terano, Minoru; George, Graeme A.

doi:10.1002/mren.201190010

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“…14 Similarly, it has also been reported that the photodegradation stability increases with decreasing the crystal size. Sumino et al 15 showed that smaller SiO 2 improved the photostability of nanocomposites by reducing the size of spherical crystals. In addition, George et al 16 explained this phenomenon through the framework of the infectious spreading model where the interfacial region between spherical crystals delays the spatial propagation of oxidation.…”

Section: Introductionmentioning

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: Introductionmentioning

confidence: 99%