The preparation of calcium pimelate modified OMMT from natural Ca-montmorillonite and its application as β-nucleating agent for polypropylene. (February 2018)

• Record Type: Journal Article
• Authors: Cao, Jing; Wen, Na; Zheng, Yuying
• Is Part Of: Polymer testing. Volume 65(2018)
• Page Start: 352
• Page End: 359
• Publication Date: 2018-02
• Subjects: Ca-montmorillonite -- Calcium pimelate -- Polypropylene -- β-nucleating agent; Polymers -- Testing -- Periodicals; Polymères -- Tests -- Périodiques; 620.1920287
• DOI: 10.1016/j.polymertesting.2017.11.031
• Languages: English
• ISSNs: 0142-9418

Abstract

Abstract: Ca-montmorillonite (Ca-MMT) was first modified with different amount of two different kinds of surfactants to obtain organo-montmorillonites (OMMTs) directly via ion exchange between Ca 2+ and alkyl ammonium cations. Then remained Ca 2+ in OMMTs was reacted with pimelic acid (HA) to obtain CaHA-OMMTs. PP/CaHA-OMMT composites were prepared. Results of FT-IR demonstrate the existence of long-chain alkyl in OMMTs, and CaHA in CaHA-OMMTs. The reaction between HA and OMMT could lead to an increase in d-spacing value of clay. CaHA-OMMTs with high CaHA contents and obviously increased d-spacing values were obtained. Results of WAXD and TEM show exfoliated clay platelets in PP/CaHA-OMMT composites. The obviously increased Tc, and the high β-phase content in PP/CaHA-OMMT composites demonstrate the high β-nucleation efficiency of CaHA-OMMTs. Composites with higher content of β-phase epitaxial crystallized on exfoliated clay platelets display largely improved impact strength. Highlights: CaHA modified OMMT (CaHA-OMMT) was prepared from natural Ca-MMT. OMMTs with high CaHA content and large d-spacing value were obtained. The CaHA-OMMT could induce a high content of β-phase in PP. β-PP epitaxial crystallized on exfoliated clay platelets benefits the toughness. A simple and low-cost way to prepare OMMT supported β-nucleating agent is proposed.