Role of Dicumyl Peroxide on Toughening PLLA via Dynamic Vulcanization

Liu, Lu; Hou, Jiarui; Wang, Liping; Zhang, Jianming; Duan, Yongxin

doi:10.1021/acs.iecr.6b02122

Cited by 16 publications

(13 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The cross-linking of biodegradable polyesters can be performed by reactive processing [15,16,17,18,19] or by irradiation such as β or γ [20,21,22]. Both methods were widely applied to cross-linking of polyesters in the presence of a low concentration of cross-linking agents such as organic peroxides [11,23,24,25,26,27,28,29,30] and multifunctional reagents [21,31,32] or chain extenders [33,34,35,36,37].…”

Section: Introductionmentioning

confidence: 99%

Structural and Thermo-Mechanical Properties of Poly(ε-Caprolactone) Modified by Various Peroxide Initiators

et al. 2019

View full text Add to dashboard Cite

The modification of poly(ε-caprolactone) (PCL) was successfully conducted during reactive processing in the presence of dicumyl peroxide (DCP) or di-(2-tert-butyl-peroxyisopropyl)-benzene (BIB). The peroxide initiators were applied in the various amounts of 0.5 or 1.0 pbw (part by weight) into the PCL matrix. The effects of the initiator type and its concentration on the structure and mechanical and thermal properties of PCL were investigated. To achieve a detailed and proper explication of this phenomenon, the decomposition and melting temperatures of DCP and BIB initiators were measured by differential scanning calorimetry. The conjecture of the branching or cross-linking of PCL structure via used peroxides was studied by gel fraction content measurement. Modification in the presence of BIB in PCL was found to effectively increase gel fraction. The result showed that the cross-linking of PCL started at a low content of BIB, while PCL modified by high DCP content was only partially cross-linked or branched. PCL branching and cross-linking were found to have a significant impact on the mechanical properties of PCL. However, the effect of used initiators on poly(ε-caprolactone) properties strongly depended on their structure and content. The obtained results indicated that, for the modification towards cross-linking/branching of PCL structure by using organic peroxides, the best mechanical properties were achieved for PCL modified by 0.5 pbw BIB or 1.0 pbw DCP, while the PCL modified by 1.0 pbw BIB possessed poor mechanical properties, as it was related to over cross-linking.

show abstract

Section: Introductionmentioning

confidence: 99%

Structural and Thermo-Mechanical Properties of Poly(ε-Caprolactone) Modified by Various Peroxide Initiators

et al. 2019

View full text Add to dashboard Cite

show abstract

“…In order to improve the interface interaction between PU and PLA, and obtain a supertoughened PLA/PU blends, the dynamic vulcanization based on PLA/PU blends system are widely reported in the literature. [33][34][35] Polyurethane elastomer prepolymer (PUEP) is a linear or cross-linked intermediate product of PU, which is terminated by reactive isocyanate groups (−NCO). Under appropriate reaction conditions, PUEP can be vulcanized to a rubber phase with a three-dimensional net-like structure.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Super-Toughened PLA/CPU Blends via One-step Dynamic Vulcanization

Sheng¹,

Wu²,

Li³

et al. 2021

Eng. Sci.

View full text Add to dashboard Cite

In this study, a serious of super-toughened poly(lactic acid) (PLA)/cross-linked polyurethane (CPU) blends were prepared via one-step dynamic vulcanization of PLA, polyethylene glycol (PEG) and isophorone diisocyanate trimer (IPDIT). FTIR and gel tests displayed that CPU was successfully generated during the dynamic vulcanization reaction. The scanning electron microscopy (SEM) images of cryo-fractured and impacted surfaces showed that the PLA/CPU blends had no obvious phase separation, which indicated good compatibility between PLA component and obtained CPU component. It also revealed the toughening mechanism dominated by shear yielding. The DSC results show the crystallinity of all the PLA/CPU blends were higher than neat PLA, indicating the CPU component can act as a crystallization nucleating agent for PLA component. When the PEG content is 30%, the impact strength and elongation at break of PLA/CPU blends can be increased to 35 times and 42 times, respectively. All the results indicate the interfacial reaction and compatibilization between the PLA and CPU resulted in the formation of super-toughened PLA/CPU blended materials.

show abstract

“…Rubber polymer, 35,36 vegetable oil, 37,38 polyurethane elastomer (PUE), 39 and thermoplastic elastomer (TPE) 40−42 are often used to toughen PLA by dynamic vulcanization, and dicumyl peroxide (DCP) is commonly used as a cross-linking agent. 43,44 The products of dynamic vulcanization of PLA and rubber can also be called PLA-based thermoplastic vulcanizates.…”

Section: ■ Introductionmentioning

confidence: 99%

Highly Toughened and Heat-Resistant Poly(lactic acid) with Balanced Strength Using an Unsaturated Liquid Crystalline Polyester via Dynamic Vulcanization

Yang

Cao

Zhang

et al. 2020

ACS Appl. Polym. Mater.

View full text Add to dashboard Cite

Poly(lactic acid) (PLA) is a well-known sustainable plastic but with an inherent brittleness, slow crystallization rate, and poor heat resistance, which significantly limits its application. In this work, toughened PLA with a balanced tensile strength, fast crystallization rate, and great heat resistance was obtained by dynamic vulcanization with an unsaturated liquid crystalline polyester (PBDPSM) in the presence of a free radical initiator of dicumyl peroxide (DCP). PBDPSM is efficient in enhancing the tensile toughness of PLA in that the elongation at break of PLA significantly increased from 15 to 179% while adding only 1 wt % PBDPSM. When adding 8 wt % PBDPSM, the PLA/PBDPSM8 blend has an elongation at break of 265%, tensile toughness of 107.2 MJ/m 3 , and notched Izod impact strength of 22.5 kJ/m 2 . Moreover, it keeps a high tensile strength of 62.6 MPa. In addition, the crystallization rate of PLA has dramatically accelerated due to the apparent nucleation effect induced by DCP and PBDPSM. PLA/PBDPSM3 shows the highest crystallinity with 44.4%. Furthermore, it shows a high Vicat softening temperature of 152.2 °C, which is 92.2 °C higher than that of neat PLA. Finally, highly toughened PLA materials with balanced tensile strength and good heat-resistant properties were realized.

show abstract

Role of Dicumyl Peroxide on Toughening PLLA via Dynamic Vulcanization

Cited by 16 publications

References 28 publications

Structural and Thermo-Mechanical Properties of Poly(ε-Caprolactone) Modified by Various Peroxide Initiators

Structural and Thermo-Mechanical Properties of Poly(ε-Caprolactone) Modified by Various Peroxide Initiators

Preparation and Characterization of Super-Toughened PLA/CPU Blends via One-step Dynamic Vulcanization

Highly Toughened and Heat-Resistant Poly(lactic acid) with Balanced Strength Using an Unsaturated Liquid Crystalline Polyester via Dynamic Vulcanization

Contact Info

Product

Resources

About