A Study on Pigment Dispersing Resins

Kobayashi, Toshikatsu; Ikeda, Shouji; Osaki, Kunihiro

doi:10.1678/rheology1973.20.1_18

Cited by 2 publications

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“…Furthermore, it is found that the slope of G 0 becomes small in the low frequency region for PP/MDBS, which suggests the existence of a plateau modulus G eq . Since the rubbery region of PP is observed at higher frequencies, this is attributed to the network structure composed of MDBS fibers, as demonstrated by Kobayashi et al [10,11]. The density of network strands n e can be calculated by an analogy of the classical theory of rubber-like elasticity as follows [28,29];…”

Section: Structure Of Core Layermentioning

confidence: 99%

“…Millner and Titus investigated the optical properties of PP containing various sorbitol-derivatives and proposed the structure required for improving the transparency of PP [5]. Kobayashi et al detected the network structure of MDBS above the melting point of PP by means of rheological analysis [10,11]. Shepard et al demonstrated that the network structure of MDBS in PP is composed of fibers with diameters of $10 nm [12]; this structure corresponds to the network structure observed when organic solvents are used [13,14].…”

Section: Introductionmentioning

confidence: 99%

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Structure and properties of injection‐molded polypropylene with sorbitol‐based clarifier

Tenma

Yamaguchi

2007

Polymer Engineering & Sci

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The relationship between the structure and the optical properties of isotactic polypropylene (PP) containing 1,3:2,4-di-p-methylbenzylidene sorbitol (MDBS) has been studied. It is found that thinner injection-molded plaques of PP/MDBS show higher levels of transparency than compression-molded plaques. The enhanced molecular orientation in the skin layer is responsible for the depression of light scattering because of polarizability fluctuation, i.e., orientation fluctuation in the crystalline phase, because the size of the fluctuation becomes larger than the wavelength of visible light. Further, the crowded network structure of the MDBS fibers generated in molten PP prohibits spherulite formation and, as a result, depresses the spatial size of polarizability fluctuation in the core, which is smaller than the wavelength of visible light. Consequently, light scattering from the core layer is also reduced. FIG. 7. Optical micrographs of the core layer for (left) PP and (right) PP/MDBS. FIG. 8. Oscillatory shear moduli, such as (closed symbols) storage modulus G 0 and (open symbols) loss modulus G

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Section: Structure Of Core Layermentioning

confidence: 99%