Strong Memory Effect of Crystallization above the Equilibrium Melting Point of Random Copolymers

By B. Reid, M. Vadlamudi, A. Mamun, H. Janani, Huanhuan Gao, Wenbing Hu, R. Alamo. 2013

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We report the effect of molecular weight and comonomer content on melt crystallization of model random ethylene 1-butene copolymers. A large set of narrowly distributed linear polyethylenes (PE) was used as reference of unbranched molecules. The samples were crystallized from a melt state above the equilibrium melting temperature and cooled at a constant rate. The exothermic peaks of the melt-solid transition are reported as the crystallization temperatures (Tc). Following expectations, the Tc of unbranched PE samples was constant and independent of the initial melt temperature. The same independence was observed for copolymers (2.2 mol % ethyl branches) with molar mass below 4500 g/mol. Moreover, the Tc of copolymers with higher molar mass depends on the temperature of the initial melt, Tc increases as the temperature of the melt decreases. We attribute the increase in Tc to a strong crystallization memory in the melt above the equilibrium melting, and correlate this phenomenon with remains in the melt o...

Subfields: Materials Chemistry, Polymers and Plastics

View Paper: https://www.semanticscholar.org/paper/ac6a6734a6edf08514e3fab09d3c030bed6fe79c

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In Polymers and Plastics

  1. Feng Yang
  2. Jiayao Zhang
  3. Jinyao Chen
  4. Ya Cao
  5. Jian Kang
  6. Zhengfang Chen
  7. M. Xiang

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