Article
Engineering, Environmental
Sinan E. Atalay, Betul Bezci, Burcu Ozdemir, Yonca Alkan Goksu, Abbas Ghanbari, Amirjalal Jalali, Mohammadreza Nofar
Summary: The degradation behaviors of amorphous polylactic acid (aPLA) and semicrystalline polylactic acid (cPLA) with similar molecular weights were compared under elevated temperatures and various environmental conditions. The increase in temperature beyond 190 degrees C significantly, but similarly, increased the degradation rate of both aPLA and cPLA samples. Temperature was found to be the most effective parameter in expediting the degradation rate of PLA.
JOURNAL OF POLYMERS AND THE ENVIRONMENT
(2021)
Article
Chemistry, Applied
Hui Zheng, Shiwen Cui, Bingxin Sun, Baiqing Zhang, Dongbing Tao, Zhiyong Wang, Yunhe Zhang, Fengming Ma
Summary: This study investigated the synergistic degradation of chitosan by discrete ultrasonic and H2O2, and analyzed the changes in its characteristics and antioxidant activity. The results showed that the synergistic degradation process was consistent with a first-order reaction and resulted in a higher antioxidant activity in the degraded chitosan.
CARBOHYDRATE POLYMERS
(2022)
Article
Agriculture, Multidisciplinary
Monique Barreto Santos, Ianne Caroline Alves Isabel, Edwin Elard Garcia-Rojas
Summary: This study evaluated the effect of high-intensity ultrasound on depolymerization of aqueous TG solutions. The results showed that ultrasound effectively reduced the molecular weight and viscosity of TG, while increasing its solubility. Moreover, ultrasound did not alter the chemical structure of TG, only breaking down the polymer structure.
JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
(2022)
Article
Polymer Science
Josh D. Wolfgang, Karina J. Reynolds, Clay B. Arrington, Roy R. Odle, Sergei I. Nazarenko, Timothy E. Long
Summary: The design of linear high performance polyetherimides with different dianhydride regioisomers allowed for tuning of thermal and rheological properties. The choice of dianhydride regioisomer influenced weight loss, molecular weight, glass transition temperature, and other properties.
Article
Polymer Science
Nazila Yaghini, Remco Tuinier, Jaap den Doelder
Summary: We present a comprehensive computational model to study the molecular structure development in the recycling extrusion process of LDPE and provide initial guidance based on reported experiments. The model incorporates the effects of scission and crosslinking reactions and offers effective strategies to mitigate computational complexity. The simulations show the shift of molecular weight distribution and branching distribution in recycled LDPE with increasing residence time, with implications for derived properties.
Article
Biochemistry & Molecular Biology
Ji Kang, Hongxia Yue, Xinxue Li, Chao He, Qin Li, Liting Cheng, Jixiang Zhang, Yan Liu, Shujun Wang, Qingbin Guo
Summary: Ultrasound was used to reduce the viscosity of xanthan gum, and its effect on the physicochemical and rheological properties of xanthan gum was investigated. The low molecular weight xanthan gum achieved through ultrasound treatment improved the quality of frozen dough bread.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Polymer Science
Kai Weng, Fang Li, Yumiko Takayama, Motomu Nishijo, Toshihisa Tanaka
Summary: This study investigated the effects of different soaking solvents on the crystallization and stretching properties of polymer films. Different results were observed in terms of microcrystal nucleation and stretching structure, depending on the soaking conditions. Soaking in ice-water or hexane promoted the formation of microcrystal nucleation and increased the tensile strength, while soaking in methanol inhibited the mobility and stretchability. Soaking in air maintained the amorphous state of the molecular chains.
Article
Construction & Building Technology
Pengpeng Duan, Tao Lei, Yongfeng Han, Heli Dai, Mengfei Hou, Wenliang Yao, Qiwei Zhou, Shaohua Zeng, Zhaohui Min
Summary: The application of wax-based warm-mixing agents in pavement construction can effectively reduce compaction temperatures of asphalt and emissions of greenhouse and harmful gases. Research has shown that wax with a molecular weight range of 1300 g/mol to 1500 g/mol has a significant viscosity-reducing effect and improves the resistance of asphalt composites against deformation and rutting at high temperatures, while wax with a molecular weight range of 400-700 g/mol improves the resistance to low-temperature cracking.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Duarte Nuno Carvalho, Cristiana Goncalves, Joaquim Miguel Oliveira, David S. Williams, Andrew Mearns-Spragg, Rui L. Reis, Tiago H. Silva
Summary: This study investigated the potential applications of marine polymers in tissue engineering through the formation of ionic-linked hydrogel networks. Results showed that the formulation with three components had the greatest mechanical properties and was suitable for cartilage tissue engineering. Tailoring the hydrogel composition can influence the mechanical behavior and guide the selection of the best composition for tissue engineering applications.
Article
Food Science & Technology
Oni Yuliarti, Esther Gusti, Jie Hong Chiang, Pei Xuan Teo, Jun Yi Ng
Summary: Two native cassava starches were isolated and characterized, showing differences in gelation behavior and physicochemical properties. Addition of low methoxyl pectin and calcium could enhance the gel strength of starch-based fruit filling, as indicated by rheological and mechanical analysis.
LWT-FOOD SCIENCE AND TECHNOLOGY
(2021)
Article
Polymer Science
Vishal Gavande, Mingi Jeong, Won-Ki Lee
Summary: This study investigated the blending performance of ultra-high molecular weight polypropylene (UHMWPP) with high-density polyethylene (PE) and maleic anhydride grafted-polyethylene (mPE). It was found that the optimal comprehensive mechanical properties were achieved when the UHMWPP content reached approximately 50 wt%, although the elongation properties did not match those of pure PE or mPE. In addition, the tensile strength of PE/UHMWPP blends significantly decreased with decreasing UHMWPP content, while the mPE/UHMWPP blends showed minimal changes in tensile strength. Furthermore, the melt index of the blend system was substantially reduced when the UHMWPP content exceeded 10% by weight.
Article
Construction & Building Technology
Yafeng Pang, Xingyi Zhu, Ming Yang, Jiangtao Yu
Summary: This study investigated the effects of adding PE fibers and AE on the rheological-strength-ductility properties of self-cleaning geopolymer composites as well as the geopolymerization reaction mechanisms. PE fibers dramatically improve ductility, while the strength first increases and then decreases with increasing AE content. The study proposes a microscopic model illustrating the tailoring mechanism of self-cleaning geopolymer composites through AE addition, showing a prospective application in road engineering.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Nutrition & Dietetics
Shiwei Li, Yingna Wang, Weipeng Dun, Wanqing Han, Chunping Xu, Qi Sun, Zichao Wang
Summary: In this study, two polysaccharide fragments, GCP-F1 and GCP-F2, were obtained from the degradation of Gynostemma pentaphyllum endophytic fungus polysaccharide. The results showed that GCP-F1 and GCP-F2 had higher antioxidant and antibacterial activities compared to the original polysaccharide GCP, and the changes in activities might be related to the variation of their molecular weights.
FRONTIERS IN NUTRITION
(2022)
Article
Biochemistry & Molecular Biology
Benchao Li, Hui Li, Jianlin Liu, Zaimei Zhang, Mengqi Chen, Lin Yue, Wei Lu, Sixue Ji, Dong Wang, Hu Zhu, Jiqian Wang
Summary: A molecular weight controllable degradation strategy using the lyase WelR was established, and the relationship between the molecular weight and the rheological properties and antioxidant activity of WL gum was systematically investigated. The study found that as the molecular weight decreased, the rheological properties and antioxidant activity of the degraded WL gum changed.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2022)
Article
Food Science & Technology
Mengmeng Jiang, Wenxue Zhu, Shulan Ruan, Yanjie Jia, Xiting Bai, Jun Sun
Summary: Using ultrasonic technology to process honey samples can reduce their moisture content and T g value, and can affect the major saccharide composition of honey. The ultrasonic power and frequency have a significant impact on the absorption peaks and wavenumber of honey molecules.
LWT-FOOD SCIENCE AND TECHNOLOGY
(2021)
