Untersuchungen zur Bildung transkristalliner Strukturen an Polyethylengrenzflächen. Teil II. Molmassenbestimmung, gravimetrische, DSC‐ und Röntgenkleinwinkelmessungen

Abstract

Carl Schorlemmer" Leuna-Merseburg, Sektion Physik, DDR-4200 Merseburg Durch Rontgenkleinwinkelstreuung, Differential-Scanning-Calorimetrie, Gravimetrie und Molmassenbestimmung wird bestatigt, dalj die an freien Polyethylenoberflachen oder an Grenzflachen zu pulverformig aufgebrachten mineralischen Beschichtungsstoffen haufig entstehenden transkristallinen Schichten durch thermooxidativen Abbau des Polyethylens bedingt sind. Ein Vergleich mit den zwischen zwei unterschiedlichen Polyethylenen ohne Einflulj des Luftsauerstoffs entstehenden Strukturen zeigt, dalj der Bildungsmechanismus der gleiche ist. Hccneaosanua 06pa30sanua mpancxpucmunuuecxux cmpyxmyp 6 nozpanuunbix nosepxnocmsx nonu3munena. Yacma I I . Onpeaenenue Monexynapnozo m a , u 3~p e n u a Memoaajuu TI'A, ACR u penmzenoscxozo ma~~oyz~~oeoeo pacceai4ua C noMoqbw MeTonoB PeHTreHoBcKoro ManoyrnoBoro paccemzm, ACK, rpaBHMeTpmsecKoro a~a n m a H onpeneneHm MoneHympHoro Beca nonTsepmnaeTcH, YTO 0 6 p a s y m q~e c~1 Tpa~cKpHcTann~secKHe CJIOH H a CB060nHbIX IIOBepXHOCTHX IIOJIH3THJIeHa I4 rpaHHqe @a3 C MHHepaJIbHbIMH HaCJIOeHHbIMM IIOpOIIIHaMH 06yC~10BneHbI TepMOOKHCJIHTeJIbHbIM pa3pyLLIeHHeM lIOJIH3THJIeHa. CPaBHeHHe CO CTPYKTYPaMH, O~P~~Y~~A M M C R MemAy ABYMH pasJIHYHbIMH THIIaMH IIOJlH3THJIeHa 6e3 BJIHHHHH KRCJIOpOAa BOBnYXa, IIOKa3bIBaeT, YTO MeXaHH3M 06pa30BaHRH 3THX CTPYKTYP OAHHaKOB.Study of the formation of transcrystalline structures at polyethylene interfaces. Part II. Determination of moleculnr mass, grauimetric, DSC, and small-angle X-ray measurements By small-angle X-ray scattering, differential scanning calorimetry, gravimetry, and determination of molecular mass it is confirmed that transcrystalline layers, which frequently arise a t free polyethylene surfaces or a t interfaces to mineral powders, are the consequence of thermooxidative degradation of the polymer. A comparison of the structures a t interfaces between two different types of polyethylene in absence of oxygen shows the same mechanism of formation.

Effect of temperature conditions of a heated plate on the crystallization of CFRTP

“…4). This difference is thought to be a result of the difference in molecular weights by grade (Adolhpi et al, 1989). Grades are classified according to differences in melt viscosity, which is determined by the length of the molecular chain; thus, the melt viscosity tends to increase with the molecular weight.…”