Homogeneous Synthesis of Isotactic Polystyrene using n-Butyllithium Initiator
نویسندگان
چکیده
منابع مشابه
One-pot synthesis of isotactic-capped syndiotactic polystyrene with a bimetallic homogeneous catalytic system
INTRODUCTION Polystyrene can be obtained in atactic (aPS), isotactic (iPS) or syndiotactic (sPS) form by a variety of catalytic systems1,2 and initiators. For instance, it is known that (pentamethylcyclopentadienyl)titanium derivatives activated by methylaluminoxane (MAO) afford a highly sPS, with %m (defined as meso diads content, calculated by 13C-nuclear magnetic resonance (NMR)) below the i...
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Suspension polymerization process is commonly used to produce expandable polystyrene. In the conventional method for producing this polymer, two different initiators are added to the process at two different temperature levels. In the industrial scale, this process is time consuming and difficult to control. A new method (Multi-Stage Initiator Dosing, MID) is proposed, in which, the initiator i...
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15 صفحه اولGrowth Shape of Isotactic Polystyrene Crystals in Thin Films
The crystal growth of isotactic polystyrene (it-PS) is investigated in very thin, 11 nm thick films. The it-PS crystals grown in the thin films show quite different morphology from that in the bulk. With decreasing crystallization temperature, the branching morphology in a diffusion field appears: dendrite and compact seaweed. The branching morphology is formed through a morphological instabili...
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ژورنال
عنوان ژورنال: Nature
سال: 1960
ISSN: 0028-0836,1476-4687
DOI: 10.1038/187410a0