Вплив високодисперсного кальциту на реологію, структуру та термостійкість композитів на основі поліпропілену

• Дата: 2019
• Автори: Дзюбенко, Л. С., Сайтарли, С. В., Сап’яненко, О. О., Горбик, П. П., Плаван, В. П., Будаш, Ю. О.
• Формат: Стаття
• Мова: Українська
• Опубліковано: Chuiko Institute of Surface Chemistry National Academy of Sciences of Ukraine 2019
• Теми: поліпропілен; кальцит; композит; реологія; структура; термостійкість
• Онлайн доступ: https://surfacezbir.com.ua/index.php/surface/article/view/683
• Назва журналу: Surface

There were highly-filled composites, based on (polypropylene) PP and containing 5 – 50 % mass. of calcite concentrate (CC), consisting in highly-dispersed calite powder, modified with organic compounds. It is established, that value for organic part content in CC was 24 % mass. CC and highly-flowing PP was used for process of concentrate granulation process. It is shown, that, when at increase of CC’s contents values, those ones of viscosity for compositions melts decreases simultaneously, dissonating with traditional laws for polymer melt flows, when those are intrisically and typically increasing. It is established, that melt flow index values, when at increase of CC contents for those ones, increasing also – from 3.1 g/10 min for pure PP, to 6,6 g/10 min for composition of 50 % mass. CC. It is discovered, that CC is having influence on melt and crystallization processes of PP. When at low (5 % mass.) and middle (10 – 20 % mass.) of CC contents values, there are meling and crystallization temperatures increasing – from 168 °C to 169 – 170 °C and from 115 °C to 117 – 118 °C, accordingly, and melting temperature range is narrowing – from 42 °C pure PP) to 38 – 34 °C, for composites of CC contents values of 30 –  50 % mass., accordingly, and crystallization temperature range – from 18 °C (pure PP, 0 % CC), to 16 – 15 °C, for composites of high CC contents values, accordingly also. There are increasing of phase transitions temperatures exists, pointing on formation of more large and perfect crystallites, however, narrowing in those ones range points on creation of more dimensionally uniform such of supermolecular structures. Such influence for CC on rheological behavior and temperature characteristics of phase transitons phenomena  links with plastyfying effect of modifier‘s chains on CC surfaces of particles, and, simultaneously, at presence of highly-flowing PP as base polymer in. CC injection making some decrease here, namely for activation energy values for oxidative thermodestruction, this phenomen is expaining with more decrease of bounding degree in system, causing with  presence of modifier additions in system, and one have influence on.