Study On Imitation Bamboo Pipes Of Continuous Fiber Reinforced Polyolefin

A mould of continuous fiber reinforced thermoplastic resin matrix pipe was designed inthis paper, and the imitation bamboo pipes were prepared using the self-assembly moldingprocess. The impact copolymer polypropylene (IPC), high density polyethylene (HDPE), linearlow density polyethylene (LLDPE) and glass fibers etc. were used as the raw materials. Thefibers of imitation bamboo pipes parallel to the pipe axial direction, distributed evenly along thecircumferential direction, and were coated with the resin therein. The effects of distribution andimpregnation of fibers were assessed by observing the capillary siphon phenomenon ofimitation bamboo pipes and pipes’ cross-section using the miniature microscope. Meanwhile,the effect of processing conditions on the fiber impregnation was analyzed. The flexuralperformances, ring stiffness and determination for external loading properties by parallel-plateloading were tested for further study of effects of preparation conditions on the performances ofimitation bamboo pipes.The capillary phenomenon of fiber reinforced pipes were studied, the results show that theimpregnation of fibers improved by use of the scattered rollers. The viscosity of resin decreasedwith the increasing of die temperature, so the impregnation of fibers changed better for betterfluidity. But too high temperature is not conducive to the formation of pressure in the die, thusaffecting the fiber infiltration. When the die temperature within the range of190～230℃, thebest die temperature for fiber impregnation of continuous glass fiber reinforced IPC (CGF/IPC)pipe, continuous glass fiber reinforced HDPE (CGF/HDPE) pipe, continuous glass fiberreinforced LLDPE (CGF/LLDPE) pipe were230℃,210℃and190℃, respectively. Overall,the impregnation effect: CGF/IPC pipe was the best, CGF/HDPE pipe was the better andCGF/LLDPE pipe was the common. This was related to the structure of the matrix resin.The results of mechanical experiments show that the mechanical performances ofimitation bamboo pipes were improved by using the scattered rolls. And the flexural strength,flexural modulus, ring stiffness and pipe stiffness of CGF/IPC pipes were increased with theincreasing of temperature of the scattered rolls. The mechanical performances of CGF/IPCpipes were best at200℃of roll preheated temperature, for the better interfacial adhesionbetween glass and matrix resin. The mechanical properties were influenced by the dietemperature, in the range of190～230℃, the mechanical properties of CGF/IPC pipe wereincreasing with increasing the die temperature, the mechanical properties of CGF/HDPE pipeincreased with die temperature and then decreased at210℃of die temperature and the mechanical properties of CGF/LLDPE pipe decreased with the increasing die temperature.From the analysis of the matrix resin, the mechanical performance: CGF/HDPE pipe＞CGF/IPC pipe＞CGF/LLDPE pipe, for the best mechanical performance of the matrix resin ofHDPE.The section morphology of pipes was observed by miniature microscope, and theinfluence of scattered roller, die temperature, different resin to the fiber impregnation wasfurther verified. Scanning electron microscopy (SEM) of CGF/IPC pipe and CGF/LLDPE pipewas observed, the interface bonding effect of CGF/IPC was superior to CGF/LLDPE pipe.The flexural stress-strain curves were fitted and the curve equations were obtained. Theslope of flexural stress-strain curves of the linear characteristic the elasticity modulus. Theresults show that the ability to resist flexural deformation resistance of CGF/IPC pipeincreasing with the die temperature, CGF/HDPE pipe has the best at210℃and CGF/LLDPEpipe decreased with the die temperature. And CGF/HDPE pipe has the best ability to resistdeformation because of its own performance of the matrix resin.