Abstract
Dibenzylidene Sorbitol is a very effective clarification additive for isotactic polypropylene. It is not effective with polyethylene although recent studies have shown that it can act as an effective nucleating and directing agent. We employ small-angle neutron scattering measurements to more fully understand the behavior of dibenzylidene sorbitol in a polyethylene matrix. The small-aangle neutron scattering clearly shows that the disappearance of the DBS fibrils is concentration dependent and for 2% DBS the midpoint of the dissolution is at 145°C and for 1% is ~ 20°C lower
Highlights
Di-benzylidene sorbitol (DBS) [Scheme I] is a widely used low molar mass gelator [1,2,3,4]
To quantify these changes we calculated the so-called invariant (Equation 6) which is directly related to the average of the square of the scattering length density differences [7]; if the density of the fibrils are constant this is proportional to the volume fraction of the fibrils
As these values are different for the 2 concentrations we can deduce that the process is one of dissolution of the fibrils in the dispersed in the perdeuterated polyethylene (DPE) rather than a melting process
Summary
Di-benzylidene sorbitol (DBS) [Scheme I] is a widely used low molar mass gelator [1,2,3,4]. This study concluded that the addition of relatively small quantities of a derivative of DBS lead to reduced space charges and a reduction in the size and number of spherulites. Small-angle neutron scattering is a powerful technique in polymer science [13].
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