Polyester poly copolymer

Polyolefin Polyester Block copolymers of styrene and butadiene or styrene and isoprene Block copolymers of styrene and ethylene or styrene and butylene Poly(vinyl chloride) and poly(vinyl acetate) ... 

THERMOPLASTIC POLYESTER POLY IMIOES SOME POLYSTYRENES FLUOROPLASTIC COPOLYMERS SOME FLUOROPLASTICS UHMWPE... 

J.H. Grezlak, The Preparation and Physical Properties of Polyester-Poly(Methyl Methacrylates) Triblock Copolymers , TR for Jan 1— March 1, 1975, Contract N00014-67-A-0151-0011. Princeton Univ, Princeton (1975)... 

Siloxane containing polyester, poly(alkylene oxide) and polystyrene type copolymers have been used to improve the heat resistance, lubricity and flow properties of epoxy resin powder coatings 43). Thermally stable polyester-polysiloxane segmented copolymers have been shown to improve the flow, antifriction properties and scratch resistance of acrylic based auto repair lacquers 408). Organohydroxy-terminated siloxanes are also effective internal mold release agents in polyurethane reaction injection molding processes 409). 

This field has been well reviewed by B. J. Tighe.(82) The polymers, for the most part, are polyesters. Poly(glycolic acid) (83) is widely used in sutures under the trade name of DEXON. Poly(lactic acid) is also used.(84) A copolymer of 92/8 mole percent poly(glycolic acid)/poly(lactic acid) (85,86) is another alternative. 

Polyurethane block copolymer with polyether/polyester Poly(vinyl alcohol)... 

Perhaps the most widely utilized (and studied) lyotropic LCP is poly j -phenylene terephthalamide (PPTA), more commonly known as Kevlar (see Figure 1.70). Kevlar belongs to the class of aramids that are well known for their LCP properties. Because these polymers are crystalline in solution, they are often spun into filaments, from which the solvent is subsequently removed in order to retain the aligned polymer structure. The result is a highly oriented, strong filament that can be used for a wide variety of structural applications. Most thermotropic LCPs are polyesters or copolymers that can be melted and molded into strong, durable objects. 

HMX HMX HMX HMX HMX HMX HMX HMX HMX HMX HMX HMX HNS NTO NTO/HMX NTO/HMX NTO/HMX PETN PETN PETN PETN PETN PETN PETN PETN PETN PETN RDX RDX RDX RDX RDX RDX RDX RDX RDX RDX RDX RDX RDX TATB/HMX Cariflex (thermoplastic elastomer) Hydroxy-terminated polybutadiene (polyurethane) Hydroxy-terminated polyester Kraton (block copolymer of styrene and ethylene-butylene) Nylon (polyamide) Polyester resin-styrene Polyethylene Polyurethane Poly(vinyl) alcohol Poly(vinyl) butyral resin Teflon (polytetrafluoroethylene) Viton (fluoroelastomer) Teflon (polytetrafluoroethylene) Cariflex (block copolymer of butadiene-styrene) Cariflex (block copolymer of butadiene-styrene) Estane (polyester polyurethane copolymer) Hytemp (thermoplastic elastomer) Butyl rubber with acetyl tributylcitrate Epoxy resin-diethylenetriamine Kraton (block copolymer of styrene and ethylene-butylene) Latex with bis-(2-ethylhexyl adipate) Nylon (polyamide) Polyester and styrene copolymer Poly(ethyl acrylate) with dibutyl phthalate Silicone rubber Viton (fluoroelastomer) Teflon (polytetrafluoroethylene) Epoxy ether Exon (polychlorotrifluoroethylene/vinylidine chloride) Hydroxy-terminated polybutadiene (polyurethane) Kel-F (polychlorotrifluoroethylene) Nylon (polyamide) Nylon and aluminium Nitro-fluoroalkyl epoxides Polyacrylate and paraffin Polyamide resin Polyisobutylene/Teflon (polytetrafluoroethylene) Polyester Polystyrene Teflon (polytetrafluoroethylene) Kraton (block copolymer of styrene and ethylene-butylene)... 

Jeong B, Lee DS, Shon J-i, Bae YH, Kim SW. Thermoreversible gelation of poly(ethylene oxide) biodegradable polyester block copolymers. J Polym Sci A 1999 37 751-760. 

Despite successful results from in vitro studies, however, the clinical applications of systems that are based on polyNlPAAm may be limited, becanse poly-NIPAAm is nondegradable and insoluble. In addition, a major problem of polyNIPAAm-based drug deUvery systems is that thermal treatment is required for controlled destabilization of the micelles and concurrent drug release, which is not always feasible in clinical situations. Therefore, to overcome the disadvantages of polyNIPAAm, controlled biodegradable systems that use polyester block copolymers as thermosensitive polymers have been investigated. 

Kinks in phenylene-based polyesters were also obtained by 2,5-thiophene dicarb-oxylate (ThA) moieties, which exhibit a core angle of 148° [12]. These copolymers exhibit stable nematic phases, but their transition temperatures are higher than those of the corresponding isophthalates. For example, the polyester composed of chlorohydro-quinone and 2,5-thiophene dicarboxylate [poly(ClHQ)/ThA] exhibits a melting transition around 410 °C with a clearing temperature above 500 °C (Fig. 7). In contrast, the corresponding polyester poly(ClHQ/TA) shows only a solid state transition at 375 °C and does not melt below 500 °C. The poly-... 

R. J. Kumpf, D. A. Wicks, D. K. Nerger, H. Pielartzik, and R. Wehrmann. Poly(arylether)/liquid crystalhne polyester block copolymers and a process for their production. US Patent 5 618 889, assigned to Bayer Corporation (Pittsburgh, PA), April 8, 1997. 

The wide applicability of aluminum porphyrin initiators (1) leads to a variety of tailored block copolymers such as polymethacrylate-polyether and polymethacrylate-polye-ster, as well as polymethacrylate-polymethacrylate and polymethacrylate-polyacrylate, that can be synthesized by sequential living polymerization of the corresponding monomers.- For example, when 1,2-epoxypropane (11, R = Me) is added to a polymerization mixture of methyl methacrylate (21, R = Me) with la at 100% conversion of 21, the polymerization of 11 takes place from the enolate growing end (32 ) to give a narrow MWD polymethacrylate-polyether block copolymer having an alcoholate growing terminal (Table 4). Likewise, the aluminum enolate species (32 ) can also react with lactones (14,15), thereby allowing the formation of a poly(methyl methacrylate)-polyester block copolymer with narrow MWD. 

Kim, M.S. et al, 2004. Preparation of methoxy poly(ethylene glycol)/polyester diblock copolymers and examination of the gel-to-sol transition. Journal of Polymer Science Part A Polymer Chemistiy, 42(22), 5784—5793. 

Scheme 30.10 CuAAC click coupling of PEG-azide onto poly(propargyl glycolide) to form the water-soluble polyester graft copolymer. Reproduced with permission from Ref [82] 2008, American Chemical Society.

As for polymer materials used for encapsulation of some low molecular weight drugs, such as cytostatics, antibiotics, etc., which are more stable compared with animal cells or biopolymers (DNA, proteins, peptides, etc.), the list of polymer materials used for their encapsulation is more extended. It includes a series of synthetic polymers as well as their copolymers with namral polymers. We could mention polyacrylates, for example, polyaUcylcyanoacrylates [11], polyester-poly(ethylene glycol) [12], poly(epsilon-caprolactone) [13], polyethylenimine-dextran sulfate [14], dextran-HEMA (hydroxy-ethyl-methacrylate) [15]. 

A plethora of bioresorbable polymer materials are adopted for medical and pharmaceutical applications. Among them, aliphatic polyesters, polycarbonates, poly (amino acids), and polyphosphoesters are the main representatives. For the synthesis of NPs, aliphatic polyesters are the most adopted materials. Data on a huge number of different polyesters can be found in the literature, but this chapter focuses on the main polyesters poly (lactic acid) (PLA), poly(glycolic acid) (PGA), polycaprolactone (PCL), and their copolymers [4]. 

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