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Study on SBS/poly (styrene-methyl methacrylate) Thermoplastic IPN Prepared by ATRP

Author: LiKeKe
Tutor: LiaoMingYi
School: Dalian University of Technology
Course: Polymer materials
Keywords: Atom transfer radical polymerization The interpenetrating polymer network SBS Poly - styrene - methyl methacrylate performance Ionization
CLC: TQ325
Type: Master's thesis
Year: 2002
Downloads: 180
Quote: 1
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Abstract


Polymerization activity at home and abroad for the first time applied to the development of interpenetrating polymer network (IPN). The use of sub footwork and the 1990s living polymerization latest technology - the atom transfer radical polymerization (ATRP) preparation of thermoplastic IPN. As polymer I triblock copolymer SBS, styrene and methyl methacrylate (MMA, small) of the ATRP copolymerization product as polymer II, prepared two sets of points are narrow molecular weight distribution of the SBS / poly (phenylene ethylene - methyl methacrylate) thermoplastic IPN. The effects of polymerization temperature, initiator system, monomer ratio and reaction time factors. The results show that, under conditions of 90 ° C, the initiator the system peroxide benzoyl (BPO) / cuprous chloride (CuCl) / 2,2 '- bipyridine (bpy) the molar ratio of BPO: of CuCl: bpy = 1:1 : 3 hours, the polymer II of molecular weight with the monomer conversion rate linear increase in molecular weight distribution to maintain low levels (<1.5), in line with the active polymerization characteristics. IPN structure were analyzed and characterized using FT-IR, NMR and GPC method. The results showed that the styrene and methyl methacrylate copolymerization reaction occurs, generating a narrow molecular weight distribution of the poly (styrene - methyl methacrylate), and thus the two components are in an IPN of the narrow molecular weight distribution. IPN mechanical properties, adhesive properties, rheological properties and dynamic mechanical properties. The results showed that, the IPN generated a significant impact on the properties of the materials. Breaking strength increased and then decreased with the improvement of polymer II content increased with the improvement of monomer MMA content. Bonding properties significantly increased with the improvement of polymer II content and MMA content. The melt viscosity decreased with the improvement of polymer II content increased slightly with the improvement of the MMA content. Dynamic mechanical results show that the glass transition temperature significantly moved toward each other, the damping factor is increased, indicating that the compatibility of the system is improved, damping performance improvement. Prepared IPN composition similar to the conventional free radical polymerization method, the polymerization method IPN performance impact. The results show that, in addition to improved tensile properties, adhesive properties and damping are not as good as the ATRP method, the rheological properties of the two less. In IPN of methyl methacrylate to be ionized, and the ionized IPN performance. The results show that after ionization, the breaking strength and modulus of the IPN was significantly improved, the elongation at break decreased, decreased flow properties.

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CLC: > Industrial Technology > Chemical Industry > Synthetic resins and plastics industry > Polymer resin and plastic
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