Published 04/03/2015
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Polymer crystallization rate challenges: the art of chemistry and processing

S.Andjelic , R.Scogna

P chains to create the a results The existence of a network structure can, in certain cases, lead to a very unique crystallization response. 87 In the late 1980s, Loomis and Murdock discovered a stereocomplex formation in absorbable polylactide systems. 88,89 Blending of roughly equi-molar quantities of poly -lactide) homopolymer and pol-y -lactide) homopolymer in the formation of poly -lactide)/poly -lactide) stereocomplexes. These systems exhibit higher Tgs, melting points, degree of crystallin-ity, and faster crystallization rates as compared with either of the individual blend components.
The intention of this study is to discuss scientific advances toward one very important challenge in the polymer processing industry: How does one increase the crystallization rate of slow-to-crystallize polymeric materials, thereby facilitating processing and enabling peak product performance? In the medical device field, where both government-controlled regulatory entities and medical professionals closely scrutinize the biocompatibility of added crystallization rate enhancers, achieving these twin goals has always been challenging. Herein, we present a review of various chemical and physical approaches used to tune the crystallization rate of semicrystalline polymers, with a strong emphasis on two novel approaches recently discovered and developed in our laboratories.
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