Direct copolycondensation of biobased elastomers based on lactic acid with tunable and versatile properties

Hu, Xiaoran; Kang, Hailan; Li, Yan; Li, Manqiang; Wang, Runguo; Xu, Riwei; He, Qinggang; Zhang, Liqun

doi:10.1039/c5py01332a

Cited by 42 publications

(21 citation statements)

References 40 publications

(40 reference statements)

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“…PBS has a global capacity of over 140,000 t/a, which was 12.8% of global capacity of biobased degradable plastics reported in 2014 (Hu et al., 2015, 2019). Commercially available PBS and PBSA products include GSPLA ® (Mitsubishi Chemicals), Bionolle™ (Showa Denko K.K.…”

Section: Synthetic Biobased Biodegradable Polymers For Food Packagingmentioning

confidence: 92%

Current status of biobased and biodegradable food packaging materials: Impact on food quality and effect of innovative processing technologies

Nilsen-Nygaard

Fernández

Radusin

et al. 2021

Comp Rev Food Sci Food Safe

166

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Fossil‐based plastic materials are an integral part of modern life. In food packaging, plastics have a highly important function in preserving food quality and safety, ensuring adequate shelf life, and thereby contributing to limiting food waste. Meanwhile, the global stream of plastics into the oceans is increasing exponentially, triggering worldwide concerns for the environment. There is an urgent need to reduce the environmental impacts of packaging waste, a matter raising increasing consumer awareness. Shifting part of the focus toward packaging materials from renewable resources is one promising strategy. This review provides an overview of the status and future of biobased and biodegradable films used for food packaging applications, highlighting the effects on food shelf life and quality. Potentials, limitations, and promising modifications of selected synthetic biopolymers; polylactic acid, polybutylene succinate, and polyhydroxyalkanoate; and natural biopolymers such as cellulose, starch, chitosan, alginate, gelatine, whey, and soy protein are discussed. Further, this review provides insight into the connection between biobased packaging materials and innovative technologies such as high pressure, cold plasma, microwave, ultrasound, and ultraviolet light. The potential for utilizing such technologies to improve biomaterial barrier and mechanical properties as well as to aid in improving overall shelf life for the packaging system by in‐pack processing is elaborated on.

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Section: Synthetic Biobased Biodegradable Polymers For Food Packagingmentioning

confidence: 92%

Current status of biobased and biodegradable food packaging materials: Impact on food quality and effect of innovative processing technologies

Nilsen-Nygaard

Fernández

Radusin

et al. 2021

Comp Rev Food Sci Food Safe

166

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“…13 Hu et al 14 synthesized a series of crosslinkable linear biobased elastomer composites with high strength and elasticity based on lactic acid, which are promising for engineering and medical applications. 13 Hu et al 14 synthesized a series of crosslinkable linear biobased elastomer composites with high strength and elasticity based on lactic acid, which are promising for engineering and medical applications.…”

Section: Introductionmentioning

confidence: 99%

Fully biobased thermoplastic elastomers: synthesis and characterization of poly(l-lactide)-b-polymyrcene-b-poly(l-lactide) triblock copolymers

et al. 2016

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Graphic AbstractFully biobased thermoplastic elastomers poly(L-lactide)-b-polymyrcene-b-poly(L-lactide) triblock copolymers with PLLA as hard block and polymyrcene as soft block were synthesized and evaluated. † Abstract Fully biobased poly(L-lactide)-b-polymyrcene-b-poly(L-lactide) triblock copolymers with PLLA as the hard block and polymyrcene as the soft block were synthesized by the ring opening polymerization of L-lactide in the presence of dihydroxyl-terminated polymyrcene precursor and organocatalyst. The copolymer composition and molecular weight of these triblock copolymers were confirmed by NMR and GPC results. Two separated glass transition temperatures were detected by both DMA and DSC techniques, indicating an existence of micro-phase separation in these triblock copolymers, which is a typical characteristic of thermoplastic elastomers with the content of soft block increases. Tensile testing revealed that PLLA-b-PM-b-PLLA (200) having 20 wt% polymyrcene show distinct yielding while other samples fracture at low strain without yielding. POM results indicated that all these spherulites show the same characteristic "Maltese cross" patterns. With the increasing content of polymyrcene, the perfection of spherulites decreases, especially for PLLA-b-PM-b-PLLA (200). Considering the current energy and environmental problems, it is expected that these fully biobased thermoplastic elastomers will be of great significance in expanding the applications of PLLA and solving the ecocrisis around us. a Determined by DMA plots Additionally, TGA is operated to investigate the thermostability and the degradation profile of PLLA-b-PM-b-PLLA triblock copolymers. It is well known that the thermal degradation of polymers may involve thermohydrolysis, zipper-like depolymerization, thermo-oxidative degradation, or transesterification reactions. 22 Fig. 4 displays the TGA and DTG curves of these triblock copolymers at a heating rate of 20 o C min -1 under nitrogen atmosphere range from 50 to 600 o C. As shown in Fig.chain segments at glass transition temperatures, respectively. Furthermore, the corresponding loss modulus and tanδ curve are also featured by two separate peaks, the low temperature peak at -40 o C is related to the glass transition of polymyrcene, while the peak at higher temperature, 67 o C, is the glass transition of PLLA segment. 22,39,40 Therefore, microphase separation is further confirmed. For other two copolymers, DMA curves have been shown in the supporting information ( Fig. S3 and Fig. S4).All plots give the similar trends like that demonstrated in Fig. 5, however, the sample was broken

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“…This type of intervention emphasizes more opportunities to use POS in neighborhoods [37]. Many studies have shown a positive association between creating POS and green spaces and mental health bene ts [3,[39][40][41][42]. According to the quality of neighborhoods on the older people's mental health [40], improving the neighborhood's characteristics can lead to the social integration of older residents and higher social interactions [42][43][44].…”

Section: Discussionmentioning

confidence: 99%

Improving the Elderly’s Mental Health by Using Public Open Spaces in Disadvantaged Urban Neighborhoods: Tehran, Iran

Lak¹,

Rashidghalam²

2021

Preprint

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Background: Today, the beneficial impact of public open spaces(POS) on the mental and physical health of the elderly is considered worldwide. However, the knowledge about these effects on the mental health of older adults in disadvantaged urban neighborhoods, especially in developing countries, is still insufficient.Methods: This study investigates the relationship between POS use and the mental health status of elderly residents in the disadvantaged neighborhoods of Tehran, the capital of Iran. The data on the frequency of use of public open spaces and the health status include ten items collected from 420 older adults of disadvantaged neighborhoods in District 10 of Tehran. We used exploratory factor analysis to explore the main factors of the elderly mental health in the disadvantaged neighborhood. Finally, the multivariate multiple regression model was used to determine the relationship between the frequency of POS use and mental health status among older seniors.Results: These ten items identified two fundamental characteristics of mental health status, including “feeling worthless” and “social interaction,” using exploratory factor analysis. “Feeling of worthlessness” was negatively significantly associated with the level of gender, marital, occupation, and education, as well as frequently attending in POS. “Social interaction” was influenced by gender, occupation, and marital status, as well as frequent use of POS. The results showed that the frequency of public open space use has a negative correlation with the feeling of worthlessness and a positive correlation with the older residents’ social interactions and contacts.Conclusion: According to the findings, increasing the more senior residents’ access to public open spaces through planning can improve their mental health as well as their social interactions, especially in disadvantaged neighborhoods.

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Direct copolycondensation of biobased elastomers based on lactic acid with tunable and versatile properties

Abstract: Tunable and versatile biobased copolyesters with excellent performances in nanocomposites, polylactide tougheners and shape memory were synthesized and characterized.

Cited by 42 publications

References 40 publications

Current status of biobased and biodegradable food packaging materials: Impact on food quality and effect of innovative processing technologies

Current status of biobased and biodegradable food packaging materials: Impact on food quality and effect of innovative processing technologies

Fully biobased thermoplastic elastomers: synthesis and characterization of poly(l-lactide)-b-polymyrcene-b-poly(l-lactide) triblock copolymers

Improving the Elderly’s Mental Health by Using Public Open Spaces in Disadvantaged Urban Neighborhoods: Tehran, Iran

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