Study On Polyamide 6 Composite Toughened By Maleated Ethylene-Octene Copolymer And Inorganic Filler

Preparation of polymer composites is one of the important methods to realized high performance of polymer materials. In this paper, the relationship between the structure and properties of polyamide 6 (PA6) composite toughened by maleated ethylene-octene copolymer (POE-g-MAH) and inorganic filler together was studied systematically. Deep investigation and analysis on high performance, application and theory of polyamide 6 composites were carried out. A lot of valuable information was obtained that can be used for development of polyamide 6 composites. The main works and conclusions were listed as following: 1. The toughening of PA6 using ethylene-octene copolymer (POE) and a maleic anhydride (MAH) functionalized version (POE-g-MAH) was examined. Combinations of the POE and POE-g-MAH blends with PA6 give higher levels of toughening than is achieved with the functionalized elastomer alone. The particles of pure POE are too large for toughening PA6, whereas POE-g-MAH alone yielded particles are too small for optimal toughening. Combinations of the two types of elastomers gave continuously varying particle size between these extreme limits. This suggests that there is an optimal rubber particle size for PA6 to toughen, and the optimal size is about 0.2~1.0μm. But particle size did not affect the yield strength and modulus of blends.2. The toughening of PA6-clay nano-composites (NCH) using ethylene-octene copolymer (POE) and a maleic anhydride (MAH) functionalized version (POE-g-MAH) was examined. The functionalized elastomer alone or combinations of the POE and POE-g-MAH blends with NCH give the same much high levels of toughening, which is much higher than that of PA6. Combinations of the two types of elastomers also gave continuously varying particle size between these extreme limits. The lowest particle size for optimal toughening is smaller for NCH than PA6. 3. Micron CaCO3 (CC1), nanometer CaCO3 (CC2), general CaCO3 (CC3) and/or talc as inorganic fillers blending with PA6 by two-screw first, and then blending with POE-g-MAH elastomer to prepare PA6/inorganic filler/OE-g-MAH composites were studied. The results showed:For PA6/CaCO3/POE-g-MAH, parts of CaCO3 were coated by POE-g-MAH to form elastomer encapsulated single CaCO3 particle as soft shell-rigid core structure, parts of CaCO3 dispersed separately in PA matrix. The size of elastomer is larger than that of PA6/POE-g-MAH.The brittle-ductile transition of PA6/CaCO3/ POE-g-MAH moves to high POE-g-MAH content with the increase of PA6/CaCO3 ratio. The synergetic effect of CaCO3 and POE-g-MAH on toughening PA6 is very outstanding when ductile fracture. However, the tensile yield strength of PA6/CaCO3/ POE-g-MAH decreases a little with the increase of CaCO3 content. The empiristic formula of the tensile yield strength of PA6/CC1/ POE-g-MAH with volume contents of CC1 and POE-g-MAH is as And the empiristic formula of the tensile yield strength of PA6/CC2/ POE-g-MAH with volume contents of CC1 and POE-g-MAH is as Talc is only dispersed in PA6 matrix in PA6/talc/POE-g-MAH composites. The particle of elastomer is somewhat larger than of PA6/POE-g-MAH. The notched impact strength of PA6/talc/POE-g-MAH is much lower than that of PA6/CaCO3/ POE-g-MAH. With the same composition, the order of yield strength from high to low of composites are: PA6/talc/POE-g-MAH> PA6/talc/CaCO3/POE-g-MAH> PA6/CaCO3/ POE-g-MAH. The result also showed that inorganic filler could improve the modulus of PA6/ inorganic filler/POE-g-MAH composites only when they dispersed in PA6 matrix.4. Micron CaCO3 (CC1), nanometer CaCO3 (CC2), or talc blending with POE-g-MAH by two-screw first, and then blending with PA6 elastomer to prepare PA6/ POE-g-MAH/inorganic filler composites were studied. The results showed:CaCO3 single particles were coated by POE-g-MAH to form soft shell-rigid core structure in PA6/CC1/POE-g-MAH. The size of elastomer alone is larger than that of PA6/POE-g-MAH. CaCO3 particles agglomerate are embedded by POE-g-MAH to form "sandbag-like?...