The modification of general purpose plastics by POE elastomers is mainly to modify rigid general purpose plastics as toughening agent, improve the toughness of rigid general purpose plastics or improve the properties of general purpose polyethylene (PE) by blending. There are few studies on PE/POE system at home and abroad. More and more studies on POE toughening rigid PP have been reported.

   First,PE/POE system

   In recent years, wood-plastic composite materials have attracted widespread attention due to their advantages of low cost, good performance, light weight and small wear and tear on processing equipment. However, the application and promotion of the composites are restricted by the fact that the composites become brittle after being filled with wood powder.

   High density polyethylene (HDPE) filled with waste wood powder was used to prepare wood-plastic composites, and metallocene polyethylene (mPE) and POE were used to toughen the composites. When the dosage is less than 12 parts, the toughening effect is not different. However, the impact strength and elongation at break of the composites toughened with POE increased rapidly after the dosage was greater than 12, and the toughening effect of OE with mPE was significantly better than that with mPE. The mechanical and thermal properties of HDPE and POE blends were studied. When POE content ≥5%, the materials were super tough at room temperature.

   The foam material prepared by POE modified PE has good toughness, elasticity and strength, and can be used as adhesive tape. 30 parts of PE with ionic structure and 6.5 parts of azodicarbonamide were added into 100 parts of POE with 30% and AffinityPL1845 with 70%. The sheets were extruded into sheets, irradiated and crosslinked, and foamed at 250℃.

   POE/PE composite material can be made into microporous film, which can be used as isolation layer of capacitor, diaper, sanitary towel, packaging film, etc.

   Second,PP/POE system

   As is known to all, polypropylene (PP), as a large number of general-purpose plastics, has shortcomings such as poor toughness at low temperature and high notch sensitivity. Therefore, in order to improve the performance of PP, toughening and modification of elastomers has been regarded as the most effective way. Although EPDM has a good toughening effect on PP, EPDM has a high price, some difficulties in broken glue and poor liquidity. With the advent of POE, it has an advantage over traditional elastomers in toughening PP. POE toughened PP can not only overcome the deficiency of EPDM toughened PP, but also give PP higher toughness, high transparency, high performance/price ratio and other characteristics. Compared with EPDM toughening PP, POE has better toughening effect than EPDM on ordinary PP, copolymer PP and high fluidity PP, and has less reduction in bending modulus and tensile strength. The content of octene in POE affects the toughening effect of POE on PP. With the increase of octene content in POE, the crystallinity, melting point and density of POE all decrease, and the pliability increases, improving the toughening effect of POE on PP.

   The commercialized POE itself is granulated and can be directly added to PP and other materials for modification. Therefore, POE is easier to process and operate than EPDM, which can greatly reduce the production cost. PP/POE blends were studied and compared with PP/EPDM blends. The results show that the two blends have similar crystallization behavior and mechanical properties, but the PP/POE blends have lower torque and better processing properties. As PP impact modifier, POE has obvious advantages in price and performance compared with EPDM.

   The phase structure, toughening mechanism and mechanical properties of PP/POE blends were studied. The results showed that the content of POE was less than that of EPDM under the same conditions, and the brittle and ductile transition could be achieved when the content of POE was 20. In PP/POE blend system, POE formed uniform "sea-island" structure OE in PP continuous phase, which toughened PP and modified PP in accordance with the silver-grain shear mechanism, and effectively improved the impact strength of PP at room temperature and low temperature.

   Toughening effect of POE on isotactic polypropylene was studied. The impact strength of the blends increased slowly when the mass fraction of POE was between 15% and 25%. The mass fraction of POE continued to increase, and the impact strength increased rapidly. The impact strength was the highest when the mass fraction of POE was 40%. Morphological structure analysis showed that the size of dispersed phase increased with the increase of POE mass fraction. The synergistic effect of the blend components significantly increased the impact strength.

   Third,General purpose plastics /POE/ inorganic filler system

   How to reduce the amount of POE without affecting the toughening effect is a hot topic and direction in the research and development of general purpose plastics /POE system. In recent years, it has been reported that adding inorganic or organic fillers to the blends can reduce the raw material cost of products to achieve the purpose of increasing, or improve the properties of products obviously.

   In order to improve the rigidity of pipe ring made of recycled high density polyethylene (RHDPE), RHDPE was modified with talc powder and self-made modified POE(MPOE).

   Results show that when the quality ratio of RHDPE/MPOE/talc powder for 50/10/4 0, system the best comprehensive mechanical properties. When the amount of talc is 40%, the ring stiffness of the prepared RHDPE pipe is 54% higher than that of the non-modified RHDPE pipe. They also studied the mechanical properties of PVC/MPOE/ inorganic filler systems, and the results showed that the composite system had the best comprehensive performance when the mass fraction of talc or calcium carbonate in the filler masterbatch was 70%.

   At home and abroad on PP/elastomer and the PP/inorganic nanometer particle systems is studied, the two systems of increased toughness increase or rigid came at the expense of other performance at the expense of, as a result, the elastomer toughening and inorganic nanoparticles toughening enhancement at the same time, generate a PP/elastomer/inorganic nanoparticles multiphase composite system is gradually become a new hot research.

   High - performance PP/POE/ nano - kaolin composites were prepared by alloying and filling. The results show that nano kaolin and elastomer POE have synergistic effects on PP toughening. The optimal dosage of nano kaolin was 5%. The impact section of PP/POE(20%)/ nano kaolin (5%) was observed by scanning electron microscope (SEM). It could be seen that the kaolin particles were coated by the matrix and dispersed in the blend matrix with layered structure, with solid interface bonding.

   After studying PP/POE/ nano SiO2 composite, it was concluded that the melt blending method could disperse POE and SiO2 evenly in the PP matrix, and the composite had the best comprehensive performance when the PP/POE/ nano SiO2 ratio was 100/15/4. Although the dispersion of nano-sio2 particles in PP is distributed as particle aggregates, the particle size of its secondary particles is equal to and less than the critical particle size. Therefore, it plays a role of absorbing energy and impeding crack growth when it is impacted, thus improving the toughness of materials.

   The PP/ elastomer/nano CaCO3 composite material was studied, and it was found that the impact strength of the material was good. POE had better toughening effect than HDPE, and the tensile strength decreased with the increase of elastomer content. TEM observation shows that nano CaCO3 has reached nano dispersion in PP matrix. The results showed that nano CaCO3 improved the deficiency caused by the decrease of hardness of materials caused by POE, and the tensile strength and bending strength were improved. The modification effect of activated nano CaCO3 is much better than that of inactive CaCO3. The composite achieves both strengthening and toughening.

   PP/POE system has excellent comprehensive performance and has developed a variety of products, especially automobile bumpers with broad market prospects.

   Generally, the notch impact strength of PP bumper special material (normal temperature) is greater than 500J/m, and the notch impact strength of -40℃ is ≥50J/m. Using PP as the base resin, POE as the toughening agent and talc as the reinforcing filler, the special materials for automobile bumpers with the required properties were prepared. Modified PP has ultra-high impact strength, its notch impact strength up to 723J/m, and has enhanced flexibility, excellent heat resistance, low temperature resistance and aging resistance. Using small bulk polypropylene (PP) as the base material and CPP, POE, wollastonite and other additives, the special materials for automobile bumper and door plate were prepared. The results showed that the formulation of PP/CPP/POE/ wollastonite blend system was reasonable, the process route and the parameters were correct. When PP: CPP: POE: wollastonite mass ratio is 45~ 48:26 ~ 29:19 ~ 22:4 ~6, the blend can completely meet the performance requirements of automobile bumper. When the mass ratio of PP: CPP: POE: wollastonite is 45~ 50:27 ~ 29:3 ~ 6:17 ~20, the blend can completely meet the performance requirements of automobile door plate. The comprehensive properties of PP modified by POE were better than that of traditional toughening agent. Wollastonite also ACTS as a toughening agent, partly acting as a staple of glass.

   Thermoplastic vulcanized rubber (TPV) can be obtained by crosslinking PP with elastomer. TPV has high application value in practical production. Graft POE onto vinyl silane and disperse it in PP. The obtained TPV is easy to process into products and has excellent surface properties. Products with high breaking strength and elongation at break, wide range of shore hardness, very low haze, use POE without odor, can be widely used in the automotive field.