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Research on a strengthening method and mechanism of expanding polypropylene pipe
Polymer Engineering and Science ( IF 3.2 ) Pub Date : 2021-07-29 , DOI: 10.1002/pen.25749 Huajian Ji 1 , Yu Wang 1 , Huihao Zhu 1 , Hui Ni 1 , Yulu Ma 1 , Linsheng Xie 1
Polymer Engineering and Science ( IF 3.2 ) Pub Date : 2021-07-29 , DOI: 10.1002/pen.25749 Huajian Ji 1 , Yu Wang 1 , Huihao Zhu 1 , Hui Ni 1 , Yulu Ma 1 , Linsheng Xie 1
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The expansion of deformation-induced crystallization of polypropylene (PP) pipes was studied. The crystal structure and melting characteristics of the samples after expanding at different expansion strains and expansion temperatures were analyzed. The results showed that the crystallinity was improved when the PP pipes were expanded, and the expansion effect made the crystal structure more perfect while the expanding temperature did not exceed the crystallization temperature. However, once expanding temperature exceeded crystallization temperature, some β lamellae crystal were stretched and transformed into α crystals structure. It showed that the expansion effect could cause the crystal phase transformation of the sample. In addition, when the expanding strain was less than 15%, the β crystal diffraction peak intensity of the sample decreased, but the α crystal diffraction peak intensity increased, and the original sparse distribution lamellae structure gradually became compact. With the expanding strain continued to increase, the oriented molecular chains underwent stress relaxation, which hindered the conversion of β crystals to α crystals. The oriented crystal structure formed by the crystal phase transformation made the PP pipe have excellent tensile and impact strength. As a result, the hoop tensile strength is increased by 13%, and the impact strengths are increased by 36%.
中文翻译：
一种膨胀聚丙烯管材的加固方法及机理研究
研究了聚丙烯（PP）管变形诱导结晶的膨胀。分析了样品在不同膨胀应变和膨胀温度下膨胀后的晶体结构和熔融特性。结果表明，PP管材扩管后结晶度有所提高，在扩管温度不超过结晶温度的情况下，膨胀效应使晶体结构更加完善。然而，一旦膨胀温度超过结晶温度，一些β片晶被拉伸并转变为α晶体结构。表明膨胀效应会引起样品的晶相转变。此外，当膨胀应变小于 15% 时，样品的β晶衍射峰强度降低，而α晶衍射峰强度增加，原来稀疏分布的片晶结构逐渐变得致密。随着膨胀应变的不断增加，取向的分子链发生应力松弛，阻碍了β晶向α晶的转化。晶相转变形成的取向晶体结构使PP管具有优异的拉伸和冲击强度。结果，环向拉伸强度提高了 13%，冲击强度提高了 36%。
更新日期：2021-09-06
中文翻译：
一种膨胀聚丙烯管材的加固方法及机理研究
研究了聚丙烯（PP）管变形诱导结晶的膨胀。分析了样品在不同膨胀应变和膨胀温度下膨胀后的晶体结构和熔融特性。结果表明，PP管材扩管后结晶度有所提高，在扩管温度不超过结晶温度的情况下，膨胀效应使晶体结构更加完善。然而，一旦膨胀温度超过结晶温度，一些β片晶被拉伸并转变为α晶体结构。表明膨胀效应会引起样品的晶相转变。此外，当膨胀应变小于 15% 时，样品的β晶衍射峰强度降低，而α晶衍射峰强度增加，原来稀疏分布的片晶结构逐渐变得致密。随着膨胀应变的不断增加，取向的分子链发生应力松弛，阻碍了β晶向α晶的转化。晶相转变形成的取向晶体结构使PP管具有优异的拉伸和冲击强度。结果，环向拉伸强度提高了 13%，冲击强度提高了 36%。
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