Study On The Modification Of Biodegradable Material P34HB

It is well known that materials are very important to our daily life, especially the polymer material which is recyclable, and with excellent mechanical property and processability. But not all the polymer materials are recyclable which give the environment great burden. And whether the material is degradable depends on its chemical structure. So it’s difficult to modify a certain polymer in order to obtain degradable material, which made the modification and application of the degradable material very important.In this paper, the studied of poly(3-hydroxybutyrate-co-4-hydroxybutyrate)(P34HB) is a novel polymer material which is synthesized by microorganisms and biocompatible. It can be used as medicine carrier and take place of the non-degradable polymer which will cause environmental pollution. So P34HB is a environmental friendly material that is worthy to develop and research.In our research, ten polyglycerol and MECH are used to synthetize many end of the epoxy polyether (EEPPE). Then FT-IR and TGA are used to charactery the structure and properties. The results show that, EEPPE structure contains epoxy groups. Slowly degradation begins at250℃, which conform to the requirements of the processing. Meanwhile, EEPPE, OMMT, PEG10000, ADR4300and ADR4370are used as modifier to P34HB. And zoom stereo microscope, chapillary rheometer, WXAD, polarizing microscope with a heating stage, electronic single-yarn strength tester are used to have an exam to the blending system, and study on the surface morphology, rheological properties, crystalline property, crystallization rate, mechanical property, degradation property and so on. The result indicates, the compatibility and mixing of EEPPE/P34HB blending system are very cracking; to a certain extent, P34HB blending fiber fracture strength increases as draw ratio rises; P34HB blending fiber breaking strength increases over time, and increasing the temperature appropriately, can improve P34HB blending fiber fracture strength; Elastic of blending fiber adding chain extender EEPPE is the best; Join chain extender EEPPE could restrain the degradation effectively; Sensitivity of P34HB on shear stress and temperature are reduced by adding EEPPE, while the molecular inter-atomic forces reduced by adding OMMT, and the flow properties of P34HB improve; Adding chain extender, such as EEPPE, OMMT, PEG, ADR4300, ADR4370, the crystalline structure of P34HB will not changed.Generally speaking, the addition of the novel synthesized chain extender EEPPE can improve the elasticity of P34HB, and reduce the sensibility to shear stress and temperature of P34HB. The decomposition temperature of modified P34HB is higher than its processing temperature. The performance of modified P34HB is optimal.