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首页> 外文期刊>Journal of Applied Polymer Science >Self-reinforcement of polypropylene by flow-induced crystallization during continuous extrusion
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Self-reinforcement of polypropylene by flow-induced crystallization during continuous extrusion

机译：在连续挤出过程中通过流动诱导的结晶来自我增强聚丙烯

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Self-reinforced polypropylene (PP) sheets have been prepared from melt flow-induced crystallization through a conical slit die fed by a conventional extruder. Their structure and properties, influenced by the die pressure ranging from 20 to 50 MPa and die outlet temperature, are studied by scanning electron microscopy observation, differential scanning calorimetry analyses, tensile strength, and light transmittance measurements. At a die outlet temperature of 162 degrees C and a pressure above 30 MPa, conspicuous increases in the melting peak, tensile strength, and light transmittance (they can be used to characterize the self-reinforcement degree of sheet) are observed. The self-reinforcement degree, however, increases only slightly with increasing pressure as it exceeds 40 MPa. Raising the die outlet temperature from 162 to 172 degrees C results in a further increase in the self-reinforcement degree (for example, a highest tensile strength of 288 MPa) while keeping the pressure at 40 MPa, so bulk PP materials with high properties can be produced from continuous melt extrusion under pressures lower than 40 MPa. Furthermore, the melt temperature plays an important role in determining the properties of self-reinforced polymeric materials. (C) 1998 John Wiley & Sons, Inc. [References: 10]
机译：自增强聚丙烯（PP）片材是通过由常规挤出机进料的锥形切缝模头由熔体流动诱导的结晶制得的。通过扫描电子显微镜观察，差示扫描量热分析，拉伸强度和透光率测量，研究了它们的结构和性能，其受模具压力范围为20至50 MPa和模具出口温度的影响。在162℃的模具出口温度和30MPa以上的压力下，观察到熔融峰，拉伸强度和透光率的显着增加（它们可用于表征片材的自增强程度）。但是，自增强程度超过40 MPa时，随压力的增加仅略有增加。将模头出口温度从162℃提高到172℃会导致自增强度（例如，最高拉伸强度288 MPa）进一步增加，同时将压力保持在40 MPa，因此具有高性能的块状PP材料在低于40 MPa的压力下通过连续熔融挤出生产。此外，熔体温度在确定自增强聚合物材料的性能中起重要作用。 （C）1998 John Wiley＆Sons，Inc. [参考：10]

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