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Modification of hyperbranched polyester thermosetting resin and nano-particles

2014-03-26

Hyperbranched polymers obtained from the 1988 birth date in the rapid development of polymer materials science fields. Compared to linear polymers, hyperbranched polymers comprising a highly branched structure and a large number of functional groups having excellent solubility and chemical screening activity ; compared with the resin polymer, a synthetic method is simple, low cost, etc. , and with a diverse method of preparing for the modified polymer provides a new approach.

Hyperbranched polyester (HBPE) is a hyperbranched polymer research hotspot of its highly branched structure and a large number of terminal functional groups grafted to make it easy to improve the compatibility with other polymers , and wide range of sources of raw materials , simple synthesis process, low cost , easy to implement industrial production. The thermosetting resin and nanoparticles are modified HBPE emerging applications , HBPE can effectively solve the problem of poor toughness due to its highly crosslinked thermosetting resin brings structure and can improve the agglomeration of the nanoparticles , the nanoparticles in the resin to improve dispersion . Wherein the aromatic and aliphatic HBPE, and terminal -modified hyperbranched polyamide HBPE - more ester . The author summarizes the major modification of HBPE of thermosetting resin and nano- particles.

1.A modified thermosetting resin Progress

HBPE common in modified thermoplastic resin , and modification of thermosetting resins are less. Gene HBPE can double the rate of the cured thermosetting resin , the thermosetting resin toughening prayer , and the terminal group -modified HBPE can increase the glass transition temperature of the thermosetting resin, the thermosetting resin to improve the thermal stability. HBPE improve the toughness enhancing its previous conventional thermosetting resin modified with a modifier which reduces the heat resistance , but the disadvantage , in order to better modified thermosetting resin .

1.1HBPE modified epoxy resin (EP) study

EP 's low shrinkage, good insulation , high chemical stability, widely used in the fields of electronics, construction, machinery, coatings and adhesives. EP has heat resistance but , the disadvantage of poor impact resistance , limiting its application. EP HBPE effectively modified toughness and heat resistance, extend the scope of application EP .

1.2HBPE modified phenolic resin (PF) research

PF acid heat resistance and good electrical insulation properties, excellent flame resistance, and dimensional stability , and has broad application prospects in the transportation, construction , mining and anti-corrosion material respects . However, the crosslinking density PF high after crosslinking , poor toughness , easy cracking in practical applications , limiting its application . The present study the toughness and thermal stability using PF HBPE more improved .

1.3HBPE modified aqueous acrylic resin (WA) research

WA energy and amino and carboxyl functional groups react to form a network structure , its heat resistance, solvent resistance , and more excellent abrasion resistance than ordinary acrylic resin. HBPE can significantly increase the degree of cross-linking reaction , mechanical properties and thermal stability of WA .

2 Progress of modified nano- particles

Nanoparticles have special size, high surface activity and catalytic effects, sound, light , heat, electricity and magnetism , etc. exhibit new features , is currently a hot research . However, small particles of nanoparticles , the surface atoms much too strong adsorption , can easily cause agglomeration . HBPE with a degree of cross-linking between the lower melt viscosity and molecular dispersion and can improve the mechanical properties of nanoparticles , thus laying the foundation for improving the nanoparticle interface compatibility with the resin and nano- particles dispersed in the resin .

2.1HBPE modified carbon nanotubes (CNTs) study

CNTs have excellent conductivity , heat resistance and good mechanical properties , in terms of functional and structural materials are widely used. HBPE low viscosity, solubility, CNTs can improve the toughness, tensile strength and other mechanical properties , CNTs to improve the dispersion of CNTs agglomeration reduce the occurrence of CNTs provide a new way of interface compatibility with other resins .

2.2HBPE modified nano- SiO2 research

Nano- SiO2 with good optical properties such as high strength and high toughness , good stability characteristics, are widely used in paints, textiles, and catalysis . But the tiny nano- SiO2 particle size , particle surface atoms and more, and contains a large number of dangling bonds , and therefore prone to inter-particle agglomeration , affecting the dispersion of nano- SiO2 . HBPE grafted onto the surface of nano- SiO2 can greatly weaken reunion nano-SiO2 particles , increasing the solubility and surface affinity nano- SiO2 particles.

2.3HBPE modified nano- Al2O3 research

Nano- Al2O3 has good dispersion and mechanical properties, heat resistance, resistance , dimensional stability, corrosion resistance, excellent in chemical , pharmaceutical, catalyst and carrier, ceramics and other fields have a wide range of applications. HBPE can significantly improve the thermal and mechanical capacity of Al2O3 , expand the application fields of nano- Al2O3 .

3 , Conclusion

Currently, the study, HBPE improve thermal properties of thermoset resins , curing and toughness as well as dispersion and mechanical properties of nanoparticles and other aspects of gradually increased , and the effect is obvious. But the durability study HBPE modified thermosetting resin is not perfect , only the durability of modified acrylic resin were studied . In addition , HBPE modified thermosetting resin modified prevalent in the EP , relatively few studies of other thermosetting resins. HBPE of modified nanoparticles only in the research stage , is not yet mature.

Future research HBPE modified thermosetting resin and nano- particles are mainly concentrated in the following areas: ( 1 ) modified thermosetting resin for durability HBPE conduct studies to explore the effects of different modification methods for durability ; ( 2 ) expanding thermoset the scope and application of the resin -modified thermosetting resin modified HBPE more in-depth study of the mechanism ; ( 3 ) still want HBPE modified nanoparticles as an important research direction , can be modified nano metal particles to penetrate direction ; ( 4 ) the use of new technology , new methods for the synthesis of novel HBPE of thermosetting resins and modified nanoparticles, resulting in a more excellent performance thermosetting resin or nanoparticles.


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