中介相态丙烯-乙烯无规共聚物在热处理过程中的结构演变

发布时间：2018-02-20 16:37

  本文关键词： 无规共聚聚丙烯 中介相 红外光谱　出处：《高分子学报》2017年09期 　论文类型：期刊论文

【摘要】：通过熔体淬冷方式制备了中介相态丙烯-乙烯无规共聚物(PPR),综合使用原位红外光谱、原位X-射线散射(WAXD/SAXS)、示差扫描量热分析(DSC)和动态机械热分析(DMA)等方法系统研究了中介相态PPR在升温过程中的微观结构演变.红外光谱研究结果表明,在连续升温过程中,中介相态PPR在30~50?C之间分子链构象发生了变化,其可能源于刚性无定形区(RAF)中部分链段构象的无序化转变,并发现在RAF中存在长度为n≤13(n为31螺旋序列中丙烯单元的个数)的螺旋序列.中介相态PPR在连续升温过程中经历了RAF中链段构象的无序化转变、中介相向α晶的转变、不完善α晶的熔融和α晶的完善化,以及α晶熔融4个转变过程.中介相向α晶的转变是一个异相成核生长过程,其结晶活化能ΔE=67.94 k J/mol.
[Abstract]:The intermediate phase propylene ethylene random copolymer (PPRP) was prepared by melt quenching. In situ infrared spectroscopy was used. In situ X-ray scattering WAXD / SAXS, differential scanning calorimetry (DSC) and dynamic mechanical thermal analysis (DMA) have been used to systematically study the microstructure evolution of intermediate phase PPR during the heating process. Intermediate phase PPR? The conformation of molecular chains between C and C may be due to the disordered conformation of some segments in the rigid amorphous region (RAF). It is also found that there exists a helical sequence in RAF with length n 鈮，

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