Effects of the molecular weight and CC functionality of poly 1‐hexene on the properties of poly 1‐hexene‐based high impact polystyrene

Abstract

Here we are aimed to unravel the effects of C C functionality and molecular weight of the rubber on the final properties of poly1-hexene-based high impact polystyrenes (HIPS). In this regard, various HIPS samples were synthesized by free radical polymerization of styrene in the presence of different weight fractions of various poly1-hexene-based impact modifiers including: (i) high molecular weight poly1-hexene (PHex), (ii) low molecular weight poly1-hexene (Olig), and (iii) 1-hexene/1,5-hexadiene copolymer (Copolym). Results showed that by increasing C C functionality from PHex to Oligm and Copoly, the degree of grafting increases which has its influence on the mechanical, thermal and morphological perspectives of the synthesized HIPSs. Besides C C unsaturation degree, the effect of rubber molecular weight on the final HIPS properties was studied as well. According to the results, molecular weight has significant effect on the final HIPS performance, too. Finally, our obtained results suggest new HIPS/Copolym sample as the one with the highest mechanical and thermal properties which is comparable well with commercial HIPS/polybutadiene grades.

Structure–property relationship in film and blow molding type high‐density polyethylene polymers from a slurry‐process industrial plant

“…Furthermore, it can be claimed from Table 6 that, film grade owns high impact strength values in all studied particle sizes in comparison to blow molding grade. This phenomenon can be attributed to the high comonomer content (short chain branching) of the film grade which leads to more flexibility of the polymer chains and subsequently caused an enhancement in the impact strength values 43,44 . Actually, higher comonomer content causes more amorphous region.…”

Preparation of novel, liquid, solvent‐free, polyolefin‐based adhesives

“…This achievement indicated that cyclization reactions suppressed branching mechanism in the case of 1,5‐hexadiene. We assumed that this observation is due to more stability of five‐member rings in oligo‐hexa than seven‐member rings in oligo‐octa sample …”

Synthesis strategies in the preparation of high impact polystyrene with different type of particles as the dispersed phase, towards a balance between impact strength and gloss

“…In HIPS-type materials the morphology of the rubber phase is strongly influenced by the reaction conditions such as stirring speed (Cunha et al 2013), initiator (Cunha et al 2013;Laganá et al 2019, Berkenwald et al 2018Chang et al 2012), chain transfer agent (Díaz de León et al 2010), among others, but principally by the nature of the rubber used (Morales et al 2006;Sardelis et al 1987;Wang et al 2019;Li et al 2016;Nazari et al 2018;Hanifpour and Bahri-Laleh 2019). In this context, the influence of the morphology on the mechanical and optical properties of HIPS has been extensively reported in the literature (Aggarwal and Livigni 1977;Anzaldi et al 1994;Katime et al 1995;Wagner and Robeson 1970;Baer 1972;Cigna et al 1976;Silberberg and Han 1978).…”