A novel waterborne g‐CPP sizing agent for the interfacial enhancement of SCF/PP composites

Abstract

To enhance the interfacial adhesion of short carbon fiber (SCF) reinforced polypropylene (PP) composites, a new modified chlorinated polypropylene resin (g‐CPP) was synthesized and utilized to manufacture the sizing agent for SCF. The findings of thermogravimetric analysis and differential scanning calorimetry showed that g‐CPP had high thermal characteristics, with its glass transition temperature (Tg) raised by 11°C.The g‐CPP sizing agent that has been developed has increased storage stability (particle size was 109.8 nm). The contact angle of SCF was reduced from 81.52° to 60.04° after sizing, and the surface free energy was raised from 29.31 mN/m soared to 47.13 mN/m. The SCF/PP composites with 1 wt% sizing agent demonstrated the best interfacial adhesion, with improvements in flexural and tensile strengths of 54% and 39%, respectively. The interfacial reinforcement mechanism of sizing agent to improve interfacial adhesion was investigated. This work proposes an attractive way for the future preparation of high‐performance SCF/PP composites.

Investigating the adhesion and rheological properties of metal organic framework incorporated polyester fiber/zeolite imidazolium salt framework‐67‐modified asphalt composite

“…The contact angle measurements were conducted using different test liquids to determine the surface free energy of the modified fiber and asphalt following Equations (1)-(3). 32 For the contact angle-related tests, a modified asphalt with a fiber doping of 1.5% was chosen to observe the adhesion effect corresponding to the optimal performance.…”

Interfacial Strengthening of Carbon Fiber/Polypropylene Composites via a Modified Acrylate Nanoemulsion

“…29 The nanoemulsion prepared in this article has advantages over previous nanoemulsions prepared by others, as shown in Table S1. According to previous research, the nanoemulsion prepared by Li 21 et al had an average droplet size of 109.8 nm with poor water dispersibility and stability of the nanoemulsion. Qiu 30 et al prepared a kind of nanoemulsion with a droplet size of 96.14 nm.…”

“…16−20 Regarding this, chlorinated polypropylene (CPP) possesses a chemical structure comparable to that of PP and its good solubility makes it easier to develop nanoemulsions for the PP matrix. 21,22 However, CPP also has the disadvantage of poor molecular polarity, which results in low solubility in polar solvents and poor adhesion to CFs. Therefore, CPP must be modified to regulate its molecular polarity and increase its solubility.…”

“…Since most CFs on the market are coated with thermosetting emulsions, we face the problem of mismatch with thermoplastic PP resins. − According to the principle of dissolution in a similar material structure, the chemical structure of the emulsion is comparable with the matrix, which can provide good interfacial compatibility. − Regarding this, chlorinated polypropylene (CPP) possesses a chemical structure comparable to that of PP and its good solubility makes it easier to develop nanoemulsions for the PP matrix. , However, CPP also has the disadvantage of poor molecular polarity, which results in low solubility in polar solvents and poor adhesion to CFs. Therefore, CPP must be modified to regulate its molecular polarity and increase its solubility.…”

“…Fortunately, the use of acrylate monomers for CPP modification , has more advantages than maleic anhydride and polyurethane. On the one hand, the introduction of polar chains of acrylates enhances the cohesive strength of CPP and increases its polarity.…”