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PNA012 is a new nucleating agent on polybutylene terephthalate. The effect of different dosage of PNA012 on crystallization and mechanical properties were investigated by means of differential scanning calorimetry, universal testing machine, melt flow indexer and vicat softening testing machine. It was revealed that the PNA012 could substantially accelerate the crystallization of PBT. Compared with the pure PBT,the crystallization temperature of PBT/PNA012 rises from 196.3 °C to 199.7 °C and crystallization degree from 34.2% to 39.9%. The tensile Strength of PBT/PNA012 is increased 9.7%. The Bending Strength has a rise of 9.3% and the heat distortion temperatures of PBT/PNA012 is increased from 115.07°C to 125.94°C.

The effect of styrene-The effect of hydroxy-terminated polybutadiene liquid rubber (HTPB) and softened agent on the performance of epoxy resin are studied. The mechanical properties of the composites investigated and the toughening mechanism were studied trough the SEM. In the HTPB/epoxy resin composites, the hardness is reduced but the elongation and the shear strength increased . Added 20wt%HTPB, the breaking elongation can be up to 16.19% and the shear strength rise to 13.74MPa. From the images of the SEM, the globular and trumpet-like hole and shear zone can hinder the development of the cracks, thus increasing the toughness of the epoxy resint. In the softened agent/epoxy resin composites, The addition of the softened agent, the breaking elongation and the impact strength have increased. From the images of SEM,we found that ,with the addition of the softened agent ,the single phase structure turns to two-phase structure and the bicontinuous phase and the brittle fracture turns to ductile fracture.