Polyethylene-block-polymethylmethacrylate

Besides the use of micromolecular multiinitiators, block copolymers can be obtained from macromolecular initiators. In a first step, a polymeric initiator is generally synthesized by reacting a mono- or difunctional polymer with a functional initiator. Various macromolecular initiators were prepared in this way including quite different sequences polystyrene [13, 18, 19, 25, 26], poly(dimethylsiloxane) [27], polymethylmethacrylate) [13,15,28], polyvinylacetate [28], polyvinylchloride [29, 30], polyesters [30], polycarbonate [31,32], polybutadiene [13, 25, 33], polyamide [34], polyethylene glycol) [35] or polyaromatic [36], An excellent review of the synthesis and uses of such macroinitiators was written by Nuyken and Voit [37]. Thus, only few typical examples are going to be mentioned below. 

Linear low-density polyethylene, 90-99 wt% LLDPE, was blended with polymethylmethacrylate, 10-11 wt% PMMA, and optiorrally a compatibilizing copolymer, viz., SEES, EPR, ethylene-styrene block copolymer, ES. The blends were found to produce blown films with improved tear in the machine direction, modulus, and impact strength... 

MAJOR POLYMER APPLICATIONS acrylics, polyamide-6, polycarbonate, polyester, polyethylene, polymethylmethacrylate, polypropylene, polystyrene, polyurethane, SAN, SBS, styrenic block copolymer... 

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