Effect of the polypropylene type on polymer–diluent phase diagrams and membrane structure in membranes formed via the TIPS processPart II. Syndiotactic and isotactic polypropylenes produced using metallocene catalysts

Propylene/1‐Hexene Copolymer as a Tailor‐Made Poly(propylene) for Membrane Preparation via the Thermally Induced Phase Separation (TIPS) Process

“…For our purposes, these changes can be considered important if during membrane preparation via the TIPS process they influence the polymer crystallization behavior and thereby limit the pore growth period. In a previous report, [20] it has been shown that the growth dynamics in the liquid-liquid phase separation is arrested by crystallization (reducing the growth period). Therefore, it was hypothesized that changing the comonomer content in the chain would change the phase diagram (crystallization curve) and thus the final morphology of the membranes would also change.…”

“…Viscosity was measured as described in a previous report, [20] and involved calculating the relative viscosity from the speed of a falling ball.…”

“…[19,20] The present paper reports the synthesis of tailor-made poly(propylene)s and the effect of the comonomer content (1-hexene) on the isotactic poly (propylene) main chain, the polymer-diluent phase diagram, the pore formation kinetics during membrane preparation and the final morphology of the membrane.…”

Syndiotactic polypropylene as potential material for the preparation of porous membranes via thermally induced phase separation (TIPS) process

“…The thermally induced phase separation (TIPS) process was used to prepare the flat sheet membranes, this procedure is described in several previous reports [9,[22][23][24][25]. Briefly, sPP or iPP and DPE (PP nominal concentration at 20, 15 and 13 wt%) were filled in a test tube, which was purged with nitrogen and sealed to prevent the oxidation.…”

Desenvolvimento de membranas de látex natural para aplicações médicas

“…O principal objetivo da técnica de microscopia eletrônica de varredura foi analisar a morfologia da membrana, ou seja, o tamanho e a distribuição de poros. [87,[91][92][93][94], separação de fase induzida termicamente (TIPS) é um método para fazer membranas microporosas.…”