Modulated crystallization behavior, polymorphic crystalline structure and enzymatic degradation of poly(butylene adipate): Effects of layered metal phosphonate
writer：Chen Yichun, Wang Siyu, Chen Qixian, Xi Zhilin, .... Yang Jinjun*
keywords：Crystallization behavior, Polymorphism, Enaymatic degradation, PBA
source：期刊
specific source：European Polymer Journal
Issue time：2015年
Layered metal phosphonate, zinc phenylphosphonate (PPZn) was synthesized and used as
a model benign nucleating agent for poly(butylene adipate) (PBA) to manipulate the
crystallization behavior, polymorphic crystalline structure and biodegradation of PBA.
Upon incorporation of PPZn, the crystallization temperature (Tc) and crystallinity of PBA
increased. Meanwhile, the crystallization rate and spherulite density of PBA increased in
the presence of PPZn, indicating that PPZn has an effective nucleating effect for PBA.
PPZn is favorable for the formation of the PBA a-modification. Furthermore, PPZn would
speed up highly the phase transition of PBA from the b- to a-one. PPZn significantly
suppressed the biodegradation of PBA. Mechanisms for nucleating, preferential formation
of the a-modification, accelerated phase transition and decreased degradation rate of PBA
in the presence of PPZn have also been proposed. It is considered that layered metal
phosphonate material is a new type of benign filler for controlling the polymorphic
crystalline structure and biodegradation rate of the polymer, which is expected to further
modify the property of the polymer and might widen the applications of biodegradable
materials in the environmental and biomedical fields.