Hyperbranched Polyester Research Articles

Effects of hyperbranched polyesters covalent functionalized multi-walled carbon nanotubes on the mechanical and tribological properties of epoxy composites

In order to improve the mechanical and tribological properties of epoxy composites, the hyperbranched polyesters with terminal carboxyl (HBP) were used for covalent functionalization of multi-walled carbon nanotubes (MWCNTs). The dispersibility and wettability of functionalized MWCNTs (HBP-NH2-MWCNTs) in epoxy resin (EP) were analyzed. The HBP-NH2-MWCNTs reinforced EP composites (HBP-NH2-MWCNTs/EP) were prepared. The microhardness and fracture toughness of HBP-NH2-MWCNTs/EP were tested, and the tribological behavior and mechanism under dry friction conditions were investigated. The results show that the hyperbranched polyesters coated on the surface of MWCNTs forms a physical barrier layer, blocking the van der Waals force between MWCNTs, effectively reducing the agglomeration phenomenon and significantly improving its dispersibility and wettability. Meanwhile, The flexible hyperbranched polyester on the surface of MWCNTs alleviates the stress concentration of the interface and improves the load transfer efficiency, which greatly improves the microhardness and fracture toughness. Under dry friction conditions, the friction coefficient and wear loss of HBP-NH2-MWCNTs/EP composites showed a trend of decreasing first and then increasing as the content of HBP-NH2-MWCNTs increased from 0.3 phr to 1.2 phr. When the content of HBP-NH2-MWCNT is 0.6 phr, the composites has the lowest friction coefficient and the wear loss, and the wear mechanism is mainly characterized by slight fatigue wear.

Compatibilization of LDPE/PA6 by Using a LDPE Functionalized with a Maleinized Hyperbranched Polyester Polyol

Low density polyethylene (LDPE)/polyamide6 (PA) blends can lead to a synergy between the properties of these materials. These blends are employed mainly in the packing industry, especially in food factories. The problem of this system is that it is inmiscible, hence requires to be compatibilized. The aim of this study is to compatibilize blends of LDPE/PA6 using a LDPE modified with a maleinized hyperbranched polyol polyester (LDPE-g-MHBP) as a compatibilizing agent. Therefore blends of LDPE (50 wt%)/PA (50 wt%) were prepared by using proportions of 5 (Blend5), 10 (Blend10), 15 (Blend15) and 20 (Blend20) wt% of the LDPE-g-MHBP of the total mix. On the other hand, to determine the efficiency of the LDPE-g-MHBP as a compatibilizing agent, a Blend0 (blends of LDPE (50 wt%)/PA (50 wt%) without LDPE-g-MHBP) was used as the control sample. By infrared (IR) analysis was evidenced the interactions between PA and LDPE-g-MHBP. By differential scanning calorimetry analysis (DSC) was observed that the LDPE-g-MHBP increased the crystallinity of the LDPE phase, but the behavior was opposite to PA. The thermal stability and the viscosity of the blends obtained with LDPE-g-MHBP were higher than those of the Blend0. Scanning electron microscopy (SEM) analysis revealed that the LDPE-g-MHBP ostensibly improved the miscibility of the LDPE/PA blends.

Evaluation of the effect of a hyperbranched polyester on the thermal, rheological, morphological and mechanical properties of polyvinyl chloride/hemp fiber blends

The aim of this study was to investigate the effect of the hyperbranched polyester polyol from second generation content on the structural, thermal, rheological, morphological and mechanical properties of recycled polyvinyl chloride/hemp fiber/hyperbranched polyester polyol obtained from second generation blends. In all blends, the amounts of recycled polyvinyl chloride and hemp fiber were 70 wt% and 30 wt% respectively. The blends were obtained in a torque rheometer. The proportions of hyperbranched polyester polyol regards to those of the polyvinyl chloride and hemp fibers were 5 wt%, 10 wt%, 15 wt% and 20 wt%. Additionally, a recycled polyvinyl chloride/hemp fiber blend was prepared to be used as control blend. Infrared analysis was then used to evidence the interaction between components of the blends. The thermal stability of the recycled polyvinyl chloride/hemp fiber/hyperbranched polyester polyol blends was lower than that of the polyvinyl chloride. Furthermore, it was not observed a trend in the thermal behavior of the recycled polyvinyl chloride blends. Hyperbranched polyester polyol increased the glass transition temperature of the blends. Additionally, rheological analysis results indicated that the hyperbranched polyester polyol reduced the viscosity of the blends.

Evaluation of the structural, thermal, rheological and morphological properties of polyethylene functionalized with a maleinized hyperbranched polyester

This experimental study was carried out with the aim of establishing and analyzing the thermal, structural, morphological, and rheological properties of a polyethylene functionalized with a maleinized hyperbranched polyester. This area of study has scarcely been reported. It is important to study the properties of this material, since it can be employed as functionalizing agent in blends of low density polyethylene and hydrophilic polymers. In addition, it also may be used as alternative for replacing the importation of polyethylene functionalized with maleic anhydride in our country. Therefore, in this experimental study, dicumyl peroxide was utilized to catalyze a functionalization reaction between low density polyethylene and maleinized hyperbranched polyester. In the experiment, dicumyl peroxide concentrations were maintained at 0.50 wt%, 1.0 wt%, 1.5 wt%, and 2.0 wt%. The resultant material after of the functionalization was characterized by various analytic methods including infrared analysis, contact angle, thermogravimetric analysis, X ray diffraction, rheological analysis and scanning electronic microscopy. The functionalization degree of the polyethylene functionalized with a maleinized hyperbranched increased with the dicumyl peroxide amount and in all cases it was higher than 8 weight percent.

A separable paper adhesive based on the starch―lignin composite

One major defect in paper adhesives is that it is difficult to remove the adhesive in waste paper. These adhesives can easily adhere to paper-making equipment, which hampers recycling. Herein, the hyperbranched polyester H102 is used to act as dispersant, and grafting copolymerization of lignin onto the starch backbone was carried out by initiation of free radicals to prepare a bio-based paper adhesive in water. The results show that the adhesive can achieve the best adhesion properties under m(H2O)/m(St) = 15:1, m(SLS)/m(St) = 0.15:1, m(APS)/m(St) = 0.02:1, and pH = 4 at 80 °C for 6 h. The addition of H102 stabilizes the performance of the adhesive and extends the shelf life. The feasibility was verified by Fourier transform infrared spectroscopy (FT-IR), Ultraviolet-visible Spectrophotometry (UV–vis), Thermogravimetric analysis (TG), X-ray diffraction (XRD) and rheological property analysis. Moreover, the as-prepared adhesive can be dissolved in H2O by heating, which is beneficial to improve the recovery and recycling of waste paper compared with the traditional adhesives.

High flux reverse osmosis membranes fabricated with hyperbranched polymers via novel twice-crosslinked interfacial polymerization method

In this study, two kinds of carboxyl-terminated hyperbranched polyesters (HBPs) with special three-dimensional structure were proposed to act as the substrates to synthesize two new kinds of acyl chloride-terminated hyperbranched polyesters (HBPACs) that were used as the key functional materials to participate in the interfacial polymerization reaction to fabricate the novel thin film composite membranes (TFC) with high water flux and monovalent salt rejection. First, the two HBPACs were synthesized from two HBPs with different molecule weights (Mn ≈ 3289 g/mol and 1964 g/mol) through acylation reaction with thionyl chloride. Then, the resultant HBPACs were used to modify the conventional reverse osmosis (RO) membrane by a new twice-crosslinked interfacial polymerization method. That is, the m-phenylenediamine (MPD) coated on the polysulfone supporting was successively reacted with HBPAC and trimesoyl chloride (TMC) which were solved in different organic solutions, respectively. The resultant HBPAC-based TFC membranes presented smoother surface and showed few change in surface hydrophilicity. Especially, one of the HBPAC-based membrane fabricated with the mixture of two HPBACs (a mass ratio of 1:1), showed a ~50% increase in water flux without sacrificing the salt rejection and exhibited excellent long-term stability compared with the conventional TFC RO membrane. Obviously, the HBPAC-based composite PA layer showed a certain cross-linking network, which not only maintained the salt retention rate but also enhanced the compatibility of HBPAC in PA main body, and as a result promoted the membrane stability. Furthermore, the residual carboxyl groups of HBPAC can act as hydrophilic sites between polyamide chains, which contribute to the rapid diffusion of water molecules through the PA layer of the membrane. Thus, this work provides a new approach to enhance the flux and stability of the membrane via the incorporation of new acyl chloride-terminated hyperbranched polymer.

Polyurethane networks based on polycaprolactone and hyperbranched polyester: Structural, thermal and mechanical investigation

A series of environmentally friendly polyurethane (PU) networks based on polycaprolactone as soft segment (SS) and Boltorn® aliphatic hyperbranched polyester of the second pseudo generation as crosslinking agent was prepared by a two-step polymerization in solution. The chemical structure of the PU networks was analyzed by Fourier transform infrared spectroscopy, while XRD analysis revealed that these samples are amorphous. Swelling measurements, water absorption study, dynamic mechanical analysis, differential scanning calorimetry, thermogravimetric analysis, mechanical tests and scanning electron microscope revealed that, swelling behavior, hydrophobicity, thermal and mechanical features and morphology of PU networks show clear dependence on polycaprolactone content. The increase of the SS content induced appearance of the microphase separated morphology, increase of thermal stability, elongation at break, hydrophobicity and swelling ability in tetrahydrofuran and toluene, but at the same time it is responsible for the decrease of crosslinking density, glass transition temperatures, rigidity, tensile strength and Young’s modulus of PU networks. Scanning electron microscope images of the fracture surfaces of PU networks show that their surface is rough, irregular, with flake-like structure, where size of flakes increases with increasing SS content. These results indicate that by choosing adequate SS content, PU coatings with diverse features based on polycaprolactone and Boltorn® aliphatic hyperbranched polyester can be designed for appropriate and desired application.

Effects of Non-Covalent Functionalized Graphene Oxide with Hyperbranched Polyesters on Mechanical Properties and Mechanism of Epoxy Composites.

In order to improve the interfacial properties of graphene oxide (GO) and epoxy resin (EP), hyperbranched polyesters with terminal carboxyl (HBP) non-covalently functionalized graphene oxide (HBP-GO) was achieved by strong π-π coupling between hyperbranched polyesters and GO nanosheets. The effects of non-covalent functionalization of GO on the dispersibility, wettability and interfacial properties were analyzed. The mechanical properties and enhancement mechanism of HBP-GO/EP composites were investigated. The results show that the hyperbranched polyesters is embedded in the GO layer due to its highly branched structure, which forms the steric hindrance effect between the GO nanosheets, effectively prevents the agglomeration of GO nanosheets, and significantly improved the dispersibility of GO. Simultaneously, the contact angle of HBP-GO with EP is reduced, the surface energy, interfacial energy and adhesion work are increased, then the wetting property of HBP-GO is significantly improved. The main toughening mechanism of HBP-GO is microcrack deflection induced by HBP-GO and plastic deformation of the EP matrix. In the microcrack propagation zones, HBP-GO may produce the pinning effect near the microcrack tips and change their stress state, resulting in microcrack deflection and bifurcation. So, the microcrack propagation path is more tortuous, which will consume much more fracture energy. Therefore, the mechanical properties of the HBP-GO/EP composites are greatly improved.

Flexible water-resistant intumescent coatings: Fabrication, characterization, and fire protective performance

In this study, a flexible water-resistant fire protective coating was fabricated by dip-coating with hyperbranched polyester (HBPE), polyvinyl formal-acetal (PVFA) and HBPE-modified ammonium polyphosphate (APP). HBPE with terminal carboxyl groups, generally being toughening additive, now was used as the surface modifier, film-forming agent and charring agent in this article. The slippery polypropylene (PP) was taken as the substrate to investigate the adhesion and fire protection performance of the coating. The plasma treatment enhanced the surface energy of PP, the hydrogen bonds between the coating and the substrate improved the adhesion, and the cooperation of HBPE and PVFA achieved the flexibility of the flame-retardant coating. Covered with a coating in an average thickness of 180 μm, the limiting oxygen index (LOI) of PP reached 32.2%, with an increase of 78.9%, and the vertical burning test (UL-94) passed V-0 rating. Cone calorimeter test (CCT) showed that peaks of heat release rate (HRR) and smoke production rate (SPR) were reduced by 79.5% and 60.4%, respectively. The structures of POC, POSi and POΦ formed during the thermal decomposition, leading to a stable char layer. All these results show that intumescent coating is of high efficiency in flame retardant and smoke suppression performance.

Thermal Field-Flow Fractionation for Characterization of Architecture in Hyperbranched Aromatic-Aliphatic Polyesters with Controlled Branching.

Thermal field-flow fractionation (ThFFF) was used to characterize the architecture of aromatic-aliphatic polyesters with varying degrees of branching. Thermal diffusion and Soret coefficients (DT and ST, respectively) provide a novel route to polymer architecture analysis. This paper demonstrates an innovative strategy to extract architecture information from the physicochemical separation parameters embedded in ThFFF retention times without explicit separation of linear and branched samples. A Soret contraction factor (g″), defined as the ratio of the ST of a branched polymer to the ST of a molecular weight equivalent linear analogue, is introduced as a metric to indicate degree of branching (DB). This approach circumvents several challenges associated with the analysis of high molar mass polymers with a high degree of branching. The g″ value is shown to be proportional to the degree of branching for linear (DB, 0%), gradually branched (DB, <50%), hyperbranched (DB, 50%), and pseudodendritic (DB, 100%) polyesters allowing the establishment of architecture calibration curves. Furthermore, positive log(g″) values (∼0.2) at low molar mass are attributed to cyclic subpopulations. This work demonstrates the usefulness of the Soret contraction factor for statistically and hyperbranched polymer systems and its sensitivity to cyclic polymers.

Nanocomposite of waterborne hyperbranched polyester and clay@carbon dot as a robust photocatalyst for environmental remediation

In this study, eco-friendly high performing waterborne hyperbranched polyester nanocomposites with different doses of clay@carbon dot nanohybrid were fabricated for the first time through an in situ polymerization technique in absence of any solvent and compatibilizing agent. X-ray diffractometeric (XRD), Fourier transform infrared spectroscopic (FTIR) and transmission electron microscopic (TEM) analyses support the formation of nanocomposite. XRD confirmed the absence of d001 reflections of bentonite clay while TEM study revealed the partial exfoliation of the layers by the polyester chains. The thermoset of this nanocomposite with hyperbranched epoxy of glycerol and poly(amido amine) showed an appreciable improvement in tensile strength (7.8–35.7 MPa), scratch hardness (4–>10 kg), impact resistance (>8.3–>10 kJ/m), Young's modulus (245–340 MPa), toughness (17.18–49.89 MJ/m3) and thermal stability (by 32 °C) compared to the pristine system. The nanocomposite also exhibited a high adsorption capacity (90.9 mg/g) of Pb(II) ions. Further, the nanocomposite was also used as a visible light active photocatalyst for removal of organic dye like Rodamine B. In addition, the nanocomposite exhibited biodegradability behavior against Pseudomonus aerugionosa bacterial strain. Thus, the nanocomposite is an exceptionally promising candidate as an environmentally friendly, low-cost and effectual adsorbent for the elimination of contaminants from the atmosphere.

UV-protection of cellulosic fabric prints using hyperbranched polyester-stabilized titania coating

This study approached a convenient method for the organic pigment coated with titania for attaining good UV-shielding properties. Hyperbranched polyesters (HBPs) included various HBPs; generation2 (HBPs16) and generation 4 (HBPs 64) are formulated for encapsulation of phthalocyanine pigments using liquid-phase separation method. The encapsulated pigments are then coated by titania via sol-gel process from n-butoxide (TBOT).Thermal gravimetric analysis (TGA), scanning/transmission electron microscope (SEM/TEM), Fourier transform infrared spectroscopy (FTIR), dynamic light scattering (DLS), X-ray diffraction pattern (XRD), and zeta potential analysis were examined to illustrate the coating performance of titania. The stabilized coated pigment nanocomposites are used for printing of cellulosic fabrics. UV shielding property of the pigment prints was systematically investigated. It is further demonstrated that the obtained titania shells of pigment prints can serve as an efficient protection against UV light and could obviously enhance the UV shielding property. The degree of protection depends on the numbers of functional hydroxyl end groups in hyperbranched polyesters. Besides, the titania coated pigment has no noticeable effect on the driving force for acceleration of pigment printing process under the unfavourable conditions.

Optimized synthesis of highly reactive UV-curable hyperbranched polyester acrylates

Highly reactive radical polyester acrylates are widely used as UV-curing binder resins for printing inks, coatings, and materials for additive manufacturing. Especially for the latter, polyesters with low viscosities are of high interest, as they allow for UV-curing materials with reduced amounts of reactive diluents to adjust the viscosity. One possibility to obtain polyester acrylates with low viscosities is the synthesis of hyperbranched structures, as the interactions of the polymer chains are reduced in comparison to their linear counterparts. In this study, an optimized synthetic protocol is described to obtain a set of highly branched polyester acrylates with a high degree of acrylation, without the use of activated reagents like anhydrides or acid chlorides that are usually employed to synthesize these products. Different cores and number of pseudo-generations of 2,2-bis(hydroxymethyl)propionic (bisMPA) are utilized to study the structure–property relationship of this class of polyesters. Comprehensive characterization of the synthesized resins and cured materials revealed high reactivities and good mechanical properties compared to similar materials reported in the literature. The design of the structure significantly influences the properties, allowing for the synthesis of specific resins with a wide range of potential applications.

Preparation and properties of waterborne polyurethane with star-shaped hyperbranched structure

The second-generation hydroxyl-terminated hyperbranched polyester (HB-20) was used as the core, and perfluorooctylethanol (PFOE), monohydroxypolyoxyethylene ether (MPEG) and n-octadecyl alcohol (C18) were grafted to the periphery of HB-20, coupled by isophorone diisocyanate (IPDI) to synthesize four star hyperbranched polymers (SHPs). The structures of the four synthesized typical SHPs were characterized by FT-IR, 1H NMR and 19F NMR. The SHPs obtained were introduced into anionic waterborne polyurethane (WPU) and waterborne polyurethanes (FWPUs) with good storage stability modified by SHPs were prepared. The particle size and morphology of FWPUs were characterized by dynamic laser light scattering and TEM. The surface chemical composition and surface hydrophilic and hydrophobic regions of FWPU film were characterized by XPS and AFM. The surface energy, mechanical properties and thermal properties of FWPU film were determined. The water absorption and moisture permeability of FWPU film were also discussed.

Wet-Dry Cycling Delays the Gelation of Hyperbranched Polyesters: Implications to the Origin of Life.

In extant biology, biopolymers perform multiple crucial functions. The biopolymers are synthesized by enzyme-controlled biosystems that would not have been available at the earliest stages of chemical evolution and consist of correctly sequenced and/or linked monomers. Some of the abiotic “messy” polymers approximate some functions of biopolymers. Condensation polymers are an attractive search target for abiotic functional polymers since principal polymers of life are produced by condensation and since condensation allows for the accurate construction of high polymers. Herein the formation of hyperbranched polyesters that have been previously used in the construction of enzyme-like catalytic complexes is explored. The experimental setup compares between the branched polyesters prepared under mild continuous heating and the wet-dry cycling associated with environmental conditions, such as dew formation or tidal activities. The results reveal that periodic wetting during which partial hydrolysis of the polyester occurs, helps to control the chain growth and delays the gel transition, a mechanism contributing to the tar formation. Moreover, the NMR and mass spec analyses indicate that continuously dried samples contain higher quantities of crosslinked and macrocyclic products, whereas cycled systems are enriched in branched structures. Ostensibly, environmental conditions have the ability to exert a rudimentary pressure to selectively enrich the polyesterification products in polymers of different structures and properties. At the early stages of chemical evolution, in the absence of biological machinery, this example of environmental control could have been for selectivity in chemical systems. As expected in marginally controlled systems, the identification of each component of the heterogeneous system has proved challenging, but it is not crucial for drawing the conclusions.

Investigation on mechanical properties and reinforced mechanisms of hyperbranched polyesters functionalized nano-silica modified epoxy composites

The grafting and coating of hyperbranched polyesters (HBP) was successfully achieved by treating the nano-silica with 3-aminopropyltriethoxysilane (APTES) to introduce amino reactive groups as the growth points. Hyperbranched polyesters functionalized nano-silica reinforced epoxy composites (HBP-APTES-SiO2/EP) was prepared by solution casting. The variation of surface functional groups and chemical elements of HBP-APTES-SiO2 were analyzed, and the mechanical properties of HBP-APTES-SiO2/EP were investigated. The results show that 2 phr HBP-APTES-SiO2/EP composites exhibits the best mechanical properties and the microhardness, fracture toughness, tensile strength and Young’s modulus can reach 70.2 HD, 1.02 MPa × m1/2, 64.6 MPa and 3353.34 MPa, respectively. The cross-sectional analysis shows that for HBP-APTES-SiO2/EP composites, the nano-silica in the crack initiation zone may contribute to a high level of plastic deformation around the crack tip to produce the significant stick-slip behavior and effectively slow down the crack propagation rate. The nano-silica in the crack propagation zone may change the stress state near the crack tips, resulting in some plastic deformation and crack deflection and bifurcation of the EP matrix as well as a few of HBP-APTES-SiO2 particle debonding to consume much more fracture energy.

Structural, thermal, rheological, morphological and mechanical properties of polypropylene functionalized in molten state with maleinized hyperbranched polyol polyester

In a previous study, we realized the functionalization of polypropylene (PP) with maleinized hyperbranched polyol polyester (MHBP) by using dicumyl peroxide (DCP) as an initiator for obtaining the PP-g-MHBPs. This process was carried out in solution (it is not environmentally friendly). Therefore, in the present work was realized the synthesis in a molten state (free of organic solvent). The acid value (AV) of the PP-g-MHBP was lower than that of the MHBP and this increased with the proportions of DCP and MHBP employed. The presence of the characteristic signals of the MHBP in the infrared (IR) spectra of the PP-g-MHBPs allowed evidencing the functionalization of PP with MHBP. The higher functionalization degree (FD) presented by the samples was 9.10 wt%. Furthermore, all contact angles of the PP-g-MHBP were lower than that of the PP and inferior to 90°. The viscosity (η) values of the PP-g-MHBPs was lower than that of the PP. The Young’s modulus, the ultimate tensile strength and, the elongation at break of the PP-g-MHBPs were independent of the FD and DCP content.

Multiarm hyperbranched polyester‐b‐Poly(ε‐caprolactone):Plasticization effect and migration resistance for PVC

A series of multiarm structure hyperbranched polyester‐b‐poly(ε‐caprolactone) (HEPCLs) with different lengths of poly(ε‐caprolactone) (PCL) segments (s = 3, 6, 7, 8) were synthesized. Hyperbranched polyester (HE) was synthesized from glycidol and succinic anhydride and used as a macromolecular polymerization initiator for ε‐caprolactone. The HEPCLs were used as polyvinyl chloride (PVC) plasticizers and the mechanical properties, thermal properties, morphology, and migration stabilities of PVC films were explored. The plasticizing efficiency increased with the increase in PCL segments, and the plasticizing efficiency of HEPCL8 exceeded that of dioctyl phthalate. Scanning electron microscopy and solid‐state 1H NMR showed that the HEPCLs possess better compatibility with PVC than HE. Moreover, HEPCLs exhibited excellent migration stability even at very harsh condition, indicating that HEPCLs can be used as no‐migration PVC plasticizers in medical products, children's toys, and food packaging. J. VINYL ADDIT. TECHNOL., 26:35–42, 2020. © 2019 Society of Plastics Engineers

A facile route to synthesize hyperbranched polyester derived from cellulose and serine and its biodegradability

Cellulose-based hyperbranched polyesters (CHBP) have many prospective applications and are therefore a highly explored area. In this work, a novel biomass-based CHBP has been successfully prepared via the polycondensation of an ABn-type glycopeptide-like monomer (A and B are different functional groups, one A and two or more B in each repeated unit). This monomer was synthesized by reacting acetylated oligomeric cellulose halide with a Fmoc (Fluorenylmethyloxycarbonyl) group-protected serine via the Koenigs-Knorr reaction, followed by the removal of the protecting group. The branching degree of CHBP-3 is 0.55. Different characterization methods show that we have successfully synthesized hyperbranched polyester. The thermal properties were analyzed by thermogravimetric analysis (TGA) with results showing a superior thermal stability for CHBP compared to raw cotton fibers. CHBP also displayed better biodegradability than cotton fibers according to a colony degradation experiment. The study demonstrated a novel and practical route for the design and preparation of hyperbranched polyester using ‘green’ natural resources.

A novel organic-inorganic hybrid K-HBPE@APP performing excellent flame retardancy and smoke suppression for polypropylene.

To overcome the flammability and severe dripping of polypropylene (PP), a novel organic-inorganic hybrid K-HBPE@APP (microencapsulated APP by a hyperbranched polyester (HBPE) via silane coupling agent (KH-550)) was obtained and used as a high-efficient flame retardant and smoke suppressant. Herein, HBPE acted as the charring agent for APP. 20 wt% of K-HBPE@APP imparted PP excellent flame retardancy, V-0 rating (UL-94 test) and 82.6% decrease in the peak of heat release rate (PHRR). However, PP with 25 wt% of mechanically mixed APP and HBPE achieved V-1 rating (UL-94 test) and 77.3% decrease in PHRR. That is because the direct contact and sufficient interaction between APP and HBPE gives full play to their synergy. Besides, K-HBPE@APP accelerated the formation of cross-linked POC/SiOSi/SiOC/SiOP/POΦ structures, leading to a strong and compact char layer with a result of dramatic reduction in heat release rate and smoke production. Furthermore, K-HBPE@APP was highly water-resistant and has good compatibility with PP matrix. In particular, the flame-retarded PP had similar tensile strength to pure PP and enhanced impact strength.