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With nanoscale microstructures of polybenzoxazine Preparation and Properties

Author: LiZuo
Tutor: ZhengSi
School: Shanghai Jiaotong University
Course: Polymer Chemistry and Physics
Keywords: Multi-block copolymer End group functionalization Mannich condensation polymerization Crosslinked Reaction induced phase separation Situ polymerization
CLC: TQ320.1
Type: Master's thesis
Year: 2011
Downloads: 66
Quote: 0
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Abstract


Polybenzoxazine is a new class of thermosetting resins, it has excellent hardness, thermal properties, mechanical properties and electrical properties, mainly in: without heat curing hardener and without acid catalysis, is a ring-opening polymerization of self, and no toxic byproducts produced small molecules, the volume shrinkage is small, can achieve zero shrinkage or volume expansion. Because of its excellent performance, polybenzoxazine gradually replace the traditional epoxy, phenolic resins and unsaturated polyesters. Benzoxazine monomers can be used phenol, paraformaldehyde and a primary amine in a solution or a molten state through the Mannich reaction synthesis. By a simple method to prepare multi-block copolymers, and introduce it into the thermosetting resin to form a benzoxazine on the nanometer scale microstructure, the overall performance of preparing a polymeric material an important way. In fact, can also be a homopolymer with a thermosetting resin precursor benzoxazine reaction, a block copolymer formed by in situ polymerization, so as to achieve the thermosetting resin is formed benzoxazine nanostructures purposes. This paper according to different mechanisms, designed and synthesized a particular alternating block copolymer and the end group functionalized homopolymers prepared using different nanostructures corresponding benzoxazine and studied their structure and performance. 1 through step we use, the use of the first synthesis of the Mannich reaction of phenolic hydroxyl groups of about 2000 molecular weight capped polybenzoxazole precursor oxazine, then further with an amino-terminated polyethylene oxide and paraformaldehyde crosslinkable polymer obtained Mannich multi-block copolymer of 4,4 '- diamino diphenyl methane-type benzoxazine-b-polyethylene oxide PBDDM-b-PPO, and the block copolymer is prepared containing benzoxazine resins. By atomic force microscopy (AFM), small angle X-ray scattering (SAXS) block copolymer testing we found PBDDM-b-PPO modified benzoxazine resin with nano-structure can be formed nanostructures induced phase separation mechanism of the reaction explained. Thermal gravimetric analysis (TGA) was used to study multi-block copolymer containing benzoxazine thermal stability, as compared to PPO benzoxazine component poor stability, we can at a suitable temperature The residue after cleavage PPO benzoxazine tester using infrared spectroscopy (FTIR) and field emission scanning electron microscope (FESEM) for authentication, the system, we have made the glass transition behavior of differential scanning calorimetry (DSC) test . (2) prepared by the Mannich reaction benzoxazine-capped polypropylene oxide and polyethylene benzoxazin-capped ethylene oxide and benzene were prepared benzoxazine-capped polypropylene oxide, benzoxazine benzoxazine resin and ethylene oxide-capped poly-benzoxazine resin, in order to study the structure of the system, we were made by atomic force microscopy (AFM) and small angle X-ray scattering (SAXS) test, we found that benzene benzoxazine-capped polypropylene oxide (ba-PPO-ba) a benzoxazine resin and benzene benzoxazine-capped polyethylene oxide (ba-PEO-ba) a benzoxazine resin have formed nanostructures, nanostructures due to their benzoxazine ba end groups and a thermal crosslinking reaction, in situ polymerization PBa-PPO-PBa and PBa-PEO-PBa block, as the curing reaction proceeds , PPO and PEO, phase separation is limited to the nanometer scale. The glass transition for the system behavior, we made the differential scanning calorimetry (DSC) test. As a comparison, we were prepared containing amino groups such as the molecular weight of double-capped polypropylene oxide (ATPPO) and two hydroxyl polyethylene oxide (PEG) a benzoxazine resin, we have found to contain double-amino terminated polyethylene oxide -dihydroxy propane and ethylene oxide-capped poly-benzoxazine resin is not nanostructures, the macro phase separation.

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