Diffusion of Stabilizers in Polypropylene
نویسندگان
چکیده
منابع مشابه
Diffusion behaviour of additives in polypropylene in correlation with polymer properties.
The migration behaviour of polymer additives in 17 polypropylene (PP) samples is described. These samples cover the major types of PP used in food packaging. The diffusion coefficients of additives with relatively small molecular masses, M(r) = 136 (limonene), as well as the migration of typical antioxidants used in PP up to M(r) = 1178 (IRGANOX 1010), were measured at different temperatures. I...
متن کاملThermal Oxidation of Polypropylene and Modified Polypropylene – Structure Effects
Ageing and stabilization polymers is a major part of materials science. Aging of polymers defined as a set of chemical and physical transformations, leads to the loss of their set the desired properties. The main role in these transformations belong to chemical processes of degradation and crosslinking of macromolecules. Processes decomposition and structuring polymer conjugates include radical...
متن کاملStabilizers of Trivial Ideals
In papers by Semmes [6], Macpherson and Neumann [4] and Brazil, Covington, Penttila, Praeger and Woods [2], it has been shown that stabilizers of filters (equivalently, stabilizers of ideals) play a crucial role in the study of maximal subgroups of infinite symmetric groups. Semmes proved that if if is a maximal subgroup of S = Sym (Q), where Q is a set of infinite cardinality K and H contains ...
متن کاملAntidepressant Activity of Mood Stabilizers
There is some evidence that the efficacy of antidepressant drugs in both unipolar and bipolar depression is decreasing and also for a possible usefulness of mood-stabilizing drugs in the pharmacotherapy of both these depressive states. In past two decades the number of drugs fulfilling the criteria for a mood stabilizer i.e. a drug which favourably influences mood abnormalities in bipolar disor...
متن کاملTHE ROLE OF VARIOUS STABILIZERS IN THE ACQUISITION OF THERMO-TOLER ANCE IN FACTOR VIII ACTIVITY
We prepared a highly purified and relatively heat stable form of factor VIII which contained 25 units per mL (u/mL) activity using PEG-4000 and developed an effective and new manufacturing process. Heat treatment was performed at 80°C for 72 hrs in the presence of different stabilizers. In our studies, we used different organic solvents as preservatives to maintain factor VIII activity, sin...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The Journal of the Society of Chemical Industry, Japan
سال: 1967
ISSN: 0023-2734,2185-0860
DOI: 10.1246/nikkashi1898.70.4_534